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Dell Glossary – Version 2
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Dell Glossary – Version 2
Glossary
Glossary
ACPI See advanced configuration and power interface.
active control module For Dell EqualLogic PS Series arrays in a dual-control module array, the control module that
is actively servicing I/O on a network. If it ceases to function, it fails over to the secondary
control module. See secondary control module.
active Controller The Dell AIM Controller that is actively managing the Dell AIM environment.
active space In Dell Compellent Storage Center, the amount of space that is used by a volume, excluding
replays. This amount does not include RAID overhead. See Replay.
actual space In Dell Compellent Storage Center, the amount of active space plus replay space for a
volume. See active space, Replay space.
advanced configuration
and power interface
(ACPI)
A standard interface for enabling the operating system to direct configuration and power
management.
agent In the Dell AIM environment (VMRacks based on Red Hat Xen and Microsoft Hyper-V, plus
personas), the optional software installed on elements that the Controller uses to manage
the elements and configure their networking properties.
agentless persona A Dell AIM persona that does not have the Dell AIM agent installed.
ambient temperature The temperature of the area or room where the system is located.
array member A Dell EqualLogic PS Series array configured into a PS Series group. Groups can have
several members.
array serial number In the Dell EqualLogic PS Series array environment, a unique Dell EqualLogic PS Series array
identification string that is encoded in the array's hardware. See service tag.
ASM/ME See Auto-Snapshot Manager/Microsoft Edition.
ASM/VE See Auto-Snapshot Manager/VMware Edition.
Asset Management
Appliance
A Dell KACE appliance-based asset management solution for IT professionals that tracks
software and license compliance. It automates the management of inventory, software
assets, versions, upgrades, and computers through a web-based dashboard.
asset tag An individual code assigned to a system, usually by an administrator, for security or tracking
purposes.
Assigned Disks In Dell Compellent Storage Center, physical storage media assigned to a disk folder in order
to become managed and used for storing volumes and replays. See disk folder, Storage
Pool.
assignment mode A mechanism to control how personas and VMRacks are assigned to hosts based on the
availability of HBAs in the host. See HBA.
async/asynchronous
replication
The process of writing data to local storage then queuing that data for storage on a remote
SAN. If the local SAN fails before a write is delivered, it is possible that the replication will
fail. See replication, synchronous replication, remote instant replay.
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automatic RAID
configuration
In the context of Dell EqualLogic PS Series groups, an internal process that configures the
user-selected RAID policy on the array.
Auto-Snapshot
Manager/Microsoft
Edition (ASM/ME)
A snap-in console application for the Microsoft Management Console that enables you to
administer Smart Copies.
Auto-Snapshot
Manager/VMware
Edition (ASM/VE)
A web-based application that works with VMware virtual environments to enable you to
administer Smart Copies.
available space Amount of total storage available on all drives.
back end In Dell Compellent Storage Center, an isolated and dedicated network that connects the
controller or storage cluster (e.g., redundant pair of controllers) to local disk enclosures.
back end network Connection between controller and disks in the Dell Compellent Storage Center Controller.
base volume (Dell
EqualLogic PS Series)
A volume mounted on the computer and reachable through its Windows-assigned drive
letter (such as G:) or mount point.
base volume (Dell
EqualLogic Group
Manager)
A volume that has snapshots. Snapshots depend on the base volume. If the base volume is
destroyed, the snapshots have been removed.
Baseboard
Management Controller
(BMC)
A server management module that implements the IPMI (Intelligent Platform Management
Interface) protocol. In the context of Dell AIM, the Controller uses the BMC to control some
models of servers remotely.
blade For the Dell AIM SDK, blade is an element of the host superclass. For Dell modular systems,
a blade refers to a modular server which is mounted into an enclosure.
BMC See Baseboard Management Controller.
Bootable media A CD, SD card, or USB memory key that is used to start your system if the system will not
boot from the hard drive.
cache A fast storage area that keeps a copy of data or instructions for quick data retrieval.
CHA See Compellent Host Adapter.
Challenge Handshake
Authentication Protocol
(CHAP)
Challenge Handshake Authentication Protocol, a network login protocol that uses an
encrypted challenge-response mechanism. Used to limit access to volumes and snapshots
to hosts that supply the correct account name and password. CHAP is also used for login/
administrator accounts.
channel In the Dell/AIM environment, one of up to eight physical connections you can assign to
switch ports and that you can connect to a persona using up to eight physical NICs. You can
configure a network to prefer one or two channels for its traffic, so if the preferred channel
fails traffic is transparently rerouted to the other channel.
CHAP See Challenge Handshake Authentication Protocol.
chassis switch In the context of Dell AIM, an Ethernet switch in a bay in a chassis. Chassis switches are
managed by the Controller.
client device
communication
certificate
In the context of EKM, a specialized encrypted key that allows a client to communicate with
the server.
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Cluster Node A physical member of a resource cluster, such as a host in a server cluster or a SAN in a
storage cluster.
collection In ASM/ME, a collection is related groups of storage objects such as volumes, snapshots, or
application components, and are represented by nodes in the ASM Console Tree under the
Collections master node. In Dell EqualLogic Group Manager, volume and replica collections
and custom snapshot collections appear in the hierarchy under the Volumes view.
Compellent Host
Adapter (CHA)
Internal cache card/battery seated in each Dell Compellent Storage Center controller. Write
cache memory is mirrored to the cache card. On a dual-controller Dell Compellent Storage
Center, the controller 1 cache card holds the mirror for controller 2, and the controller 2
cache card holds the mirror for controller 1. On a single-controller Dell Compellent Storage
Center, the cache card holds the mirror for the single controller.
configuration The database that describes the entire contents and configuration of the Dell AIM
environment.
Conservation Mode In Dell Compellent Storage Center, a data preservation mode that is reached when remaining
free space drops to a critical threshold (typically 10%, up to 32 GB). In conservation mode,
the Dell Compellent Storage Center generates an alert, prevents new volumes from being
created, and starts expiring replays at a faster rate to free up space. See Emergency Mode.
Console The web-based user interface that you use to monitor and work with the elements in the Dell
AIM environment. The Dell AIM Console is hosted by the Dell AIM Controller.
control module In Dell EqualLogic PS Series arrays, the physical processor and interface component. A
control module contains the Dell EqualLogic PS Series firmware in flash memory and
provides temporary power continuity for data sorted in cache memory. It has multiple
network interfaces and an optional serial port. An array can contain two hot-swappable,
dual redundant controllers. The active control module serves I/O, while the secondary
control module mirrors data in its cache.
control panel The part of the system that contains indicators and controls, such as the power button and
power indicator.
Control Port The destination iSCSI port to which iSCSI initiators (servers) connect in order to make
storage requests. In a Dell Compellent Storage Center configured for virtual port mode, a
control port is created for each iSCSI fault domain, to redirect iSCSI traffic to the appropriate
virtual port.
Controller (Dell AIM) Software that manages the physical and virtual hardware, software, and network
configurations and hosts the Dell AIM Console. In the context of a pair of resilient
Controllers, each Controller runs on a dedicated server but shares a configuration database
and other key files on a shared file system.
Controller (Dell
Compellent)
Provides disk aggregation (RAID), I/O routing, error detection, and data recovery. Provides
the intelligence for the entire Dell Compellent Storage Center subsystem. Every Storage
Center system contains at least one. Storage Center and recommend corrective actions to
improve performance and availability of the system.
Controller Services In the context of Dell AIM, the virtual IP address or addresses the Controller users for
communications with the System Control Network (SCN), managed switches, the Console
and CLI, and so on. By default, this is a single virtual IP address on the active Controller, but
you can specify unique addresses for the services SCN Services and SNMP Trap Collector.
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Copilot Services Within Dell Compellent Storage Center, the combination of centralized support, product
education and sales resources that proactively monitor the system and recommend
corrective actions to improve performance and availability of the system.
Copy-Mirror-Migrate A Dell Compellent Storage Center feature allowing volumes to be migrated between different
disk types and RAID levels.
credential store In the context of EKM, a repository that holds credential information across sessions.
Credential information is security data such as user names, passwords, and certificates.
Cryptographic Object A method of securing data.
Data Collector A Dell Compellent Enterprise Manager component that runs in the background on a server,
collecting information on all Dell Compellent Storage Center systems connected to the
server.
Data Instant Replay A Dell Compellent Storage Center feature that captures space-efficient point-in-time copies
(PITC) of a volume on the local SAN at defined intervals, providing the ability to roll back a
volume to a previous point in time. See Replay, snapshot.
Data Progression A Dell Compellent Storage Center feature that automatically migrates data pages to higher or
lower performance devices, based on the level of I/O activity (demand). See tiered storage.
DDR See Double-data Rate.
delegated space In the context of the Dell EqualLogic Group Manager, a space on a group set aside to store
received replicas for a partner.
Dell Encryption Key
Manager (EKM)
Dell Encryption Key Manager (EKM) secures the data stored on LTO tape cartridges by
managing encryption keys for Dell tape automation solutions.
Dell Remote Access
Controller (DRAC)
An interface card that provides out-of-band management facilities. The controller has its
own processor, memory, network connection, and access to the system bus, and allows
system administrators to control systems remotely across a network.
device driver A program that allows the operating system or some other program to interface correctly
with a peripheral.
DHCP See Dynamic Host Configuration Protocol.
Digital Versatile Disk Digital versatile disc or digital video disc (DVD).
disk folder In Dell Compellent Storage Center, a collection of physical storage media devices (disks,
SSDs) that can be viewed and managed by a user. Disk folders determine the storage
pool(s) from which volume storage space is allocated. Although disk folders can be
associated with multiple storage pools, Dell Compellent Storage Center performance is
maximized by assigning all disks to the same folder and storage pool.
Disk Position In Dell Compellent Storage Center, the slot position of a disk drive within its enclosure, in
row-column notation. For example, disk position 01-02 refers to the slot in the first row from
the top and second column from the left.
DNS See Domain Name System.
Domain Name System
(DNS)
A method of translating Internet domain names, such as www.example.com, into IP
addresses, such as 208.77.188.166.
dormant Persona In the AIM environment, a persona that is not currently running (or waiting to run) on a host.
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Double-data Rate (DDR) Double-data rate. A technology in memory modules that potentially doubles the data rate by
transferring data on both the rising and falling pulses of a clock cycle.
DRAC See Dell Remote Access Controller.
DRAM See Dynamic random-access memory.
Dual Redundant In Dell Compellent Storage Center, a storage profile option for protecting against the loss of
any two drives, typically by using RAID 10 and/or RAID 6.
DVD See Digital Versatile Disc.
Dynamic Host
Configuration Protocol
(DHCP)
A method of automatically assigning an IP address to a client system.
Dynamic random-
access memory
(DRAM)
A system's RAM is usually made up entirely of DRAM chips.
EKM See Dell Encryption Key Manager.
EKM Administrator In the context of EKM, the super user who can create or delete users and groups.
EKM Encryption
Manager (tklmadmin)
In the context of EKM, the daily user who creates or deletes keys and devices.
Emergency Mode In Dell Compellent Storage Center, a mode that is reached when the system can no longer
operate because there is no more free space. In emergency mode, all server I/O is rejected
and all volumes are taken offline and cannot be brought back online until enough space is
freed to exit emergency mode. See Conservation Mode .
enclosure A physical enclosure that provides a single interface, power, and cooling to multiple disks or
blades.
environment In the context of Dell AIM, the collection of hardware, software, and network configurations
managed by a Dell AIM Controller.
Eth0 See Ethernet port 0.
Eth1 See Ethernet port 1.
Ethernet port 0 (Eth0) In Dell Compellent Storage Center, Eth0 is an Ethernet interface dedicated to management.
Ethernet port 1 (Eth1) In Dell Compellent Storage Center, Eth1 is an Ethernet interface dedicated to inter-process
communication between controllers, for clustering or remote replication.
external network In the context of the Dell AIM environment, a network that is not part of the Dell AIM
environment but is physically and logically connected to it.
external switch In the context of the Dell Aim environment, a switch that is not part of the Dell AIM
environment, but is physically and logically connected to it.
Fabric A combination of interconnected switches that act as a unified routing infrastructure. It
allows multiple connections among devices on a SAN and lets new devices enter
unobtrusively. A FC (or iSCSI) topology with at least one switch present on the network.
FastTrack An optional Dell Compellent Storage Center utility that dynamically places the most active
data on the outer (faster) disk tracks.
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FAT See File Allocation Table.
Fault Domain Within the Dell Compellent Storage Center environment, a Fault Domain identifies a failover
set. In Virtual Port mode, all front-end ports can be part of the one fault domain. In Legacy
Mode, each primary and reserved port creates one fault domain.
FC See Fibre Channel.
FE See Front End Network.
Fibre Channel (FC) A high-speed interconnect used to connect servers to controllers and back-end disk
enclosures. FC components include HBAs, hubs, switches, and cabling. The term FC also
refers to a high-speed, fully duplexed serial communication protocol permitting data transfer
rates of up to 10 Gigabit per second.
File Allocation Table
(FAT)
The file system structure used by MS-DOS to organize and keep track of file storage. The
Microsoft Windows operating systems can optionally use a FAT file system structure.
File Transfer Protocol
(FTP)
An application layer protocol used to transfer bulk-data files between machines or hosts.
Front End Network (FE) The component in the Dell Compellent Storage Center SAN flow of data writes (server to
switch to controller to disks) that initiates data writes. In general, servers (or switches) are
the front end of the controller. However, a Storage Center system that is replicating data to a
remote system is the front end of the remote system. See back end.
FTP See File Transfer Protocol.
GB See Gigabyte(s).
Gigabyte(s) (GB) 1024 megabytes or 1,073,741,824 bytes. However, when referring to hard-drive capacity; the
term is usually rounded to 1,000,000,000 bytes.
group See PS Series group.
HBA See Host Bus Adapter.
HIT/LE See Host Integration Tools for Linux.
HIT/ME See Host Integration Tools for Windows.
HIT/VM See Host Integration Tools for VMware.
host In the Dell AIM environment, a host may be a physical server (rack-mounted or blade) or
virtual machine. In the Dell AIM SDK, a superclass that includes blade servers, rack-
mounted servers, and virtual machines (VMs).
host adapter A controller that implements communication between the system's bus and the peripheral
device, typically a storage device.
Host Bus Adapter (HBA) A device, typically an add-on card, that connects a server to a SAN (Storage Area Network).
Each HBA is uniquely identified on the SAN by its WWPN (World Wide Port Number).
Common HBA types include Fiber Channel and iSCSI.
Host Integration Tools
for Linux (HIT/LE)
A suite of tools that integrate ESX systems with Dell EqualLogic PS Series storage arrays. It
includes the Auto Snapshot Manager/VMware Edition (ASM/VE), EqualLogic Datastore
Manager, and EqualLogic Virtual Desktop Deployment Utility.
Host Integration Tools
for Windows (HIT/ME)
A suite of applications that enable you to configure and manage an array. It includes ASM/
ME, DSM (Multipath I/O Device Specific Module), and RSW (Remote Setup Wizard).
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Host Integration Tools
for VMware (HIT/VM)
A suite of tools that integrate Linux systems with Dell EqualLogic PS Series storage arrays. It
includes the Remote Setup Wizard Command Line Interface (RSWCLI), the EqualLogic Host
Performance and Configuration Tuning Suite (eqltune), and EqualLogic Log Gathering Facility
(eqllog).
Hot Spare Disk In the Dell Compellent Storage Center environment, a Hot Spare disk is a backup disk. In the
event that an active array fails, the controller makes the Hot Spare part of the active array
and rebuilds data on the fly. Although the Hot Spare becomes an active disk without human
intervention, remember to replace the failed drive as soon as possible, so that the array is
again protected with a new Hot Spare. Hot spares can span multiple disk enclosures.
Storage Center Hot Spares can have a different capacity than the data drive it replaces.
hot-plug The ability to insert or install a device, typically a hard drive or an internal cooling fan, into
the host system while the system is powered on and running. Also referred to as hot-swap.
hot-swap See hot-plug.
I/O Input/Output. A keyboard is an input device, and a monitor is an output device. In general, I/
O activity can be differentiated from computational activity.
ID In the Dell AIM environment, a unique identifier for an element in the , assigned when it is
added to the environment.
iDRAC See integration Dell Remote Access Controller.
IKEv2-SCSI A protocol used for certificate creation.
image Specific to Dell AIM, the actual bits stored on a disk or storage array that a persona or
VMRack boots, along with information the Controller uses to boot that image on a specific
type of host. You can configure a persona or VMRack with more than one image, for
example, so the same persona can boot on either a physical server or a virtual machine.
infiniBand infiniBand offers point-to-point bidirectional serial links intended for connection of
processors and high-speed peripherals.
Instant Replay See Data Instant Replay.
integration Dell Remote
Access Controller
(iDRAC)
A remote access controller that uses the Internet SCSI protocol.
Intelligent Platform
Management Interface
(IPMI)
A protocol implemented by management modules in some servers, which is used to control
the servers remotely. The blade management modules in the Dell servers implement iPMI.
interconnect switch A switch in the Dell AIM environment, managed by the Controller, that you use to
interconnect elements such as chassis, vRacks, other interconnect switches, and external
switches.
internet SCSI (iSCSI) Internet SCSI (see SCSI). A protocol that encapsulates standard SCSI commands for
communication between client servers (iSCSI initiators) and network storage devices (iSCSI
targets) on IP networks.
IPMI See Intelligent Platform Management Interface.
iSCSI See Internet SCSI.
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Key Management
Interoperability
Protocol (KMIP)
Standards set up for the communication between enterprise key management systems and
encryption systems.
Key Serving Ports Ports used by the operating system to communicate in EKM.
Keygroup In EKM, a set of keys assigned to a specific department, area, or hardware type.
Keys An encrypted certificate used to protect data in EKM.
Keystore / Keygroup/
Master Keystore
A group of encrypted keys in EKM.
KMIP See Key Management Interoperability Protocol.
Java Database
Connectivity (JDBC)
An API for the Java programming language that defines how a client may access, query, and
update data in a database.
JDBC See Java Database Connectivity.
Leader Controller The primary controller in a dual controller Dell Compellent Storage Center. Normally, the
leader and peer controllers share the storage I/O load, essentially doubling throughput, but
only the leader controller performs external management functions. If one controller fails,
the remaining controller becomes or remains the leader and assumes the duties of both
controllers. See Peer Controller.
Legacy Mode In Dell Compellent Storage Center, fault domains are configured to dedicate pairs of primary
and reserved front end ports, connected through redundant equipment, as a mechanism to
protect storage traffic against a single point of failure. See Fault Domain, Virtual Port or
Virtual Port Mode.
Linear Tape-Open (LTO) An open standards tape format.
logical unit number
(LUN)
A logical unit is a conceptual division (a subunit) of a storage disk or a set of disks. Each
logical unit has an address, known as the logical unit number (LUN), which allows it to be
uniquely identified.
LTO See Linear Tape-Open.
LTO Key Group Rollover In EKM, a set of keys assigned to be used once the default keygroup is depleted.
LUN See logical unit number.
MAC address See Media Access Control address.
Managed Disks In Dell Compellent Storage Center, storage media devices (disks, SSDs) that are assigned to
a disk folder in order to associate those devices with a storage pool. See Storage Pool, disk
folder.
managed system A managed system is any system that is monitored and managed using Dell OpenManage
Server Administrator.
management IP
address
Address used to used to connect to an intelligent IP-enabled device in order to monitor or
manage that device. The address may be dedicated for exclusive use by management
applications or shared for use by management and service applications.
management network An optional management network separates iSCSI traffic (Volume I/O) from management
traffic (GUI and CLI sessions, and other group management communications and intergroup
operations).
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management station A system used to remotely manage one or more managed systems from a central location.
Manual Replay A Dell Compellent Storage Center feature that allows the user to manually create point in
time copies of volumes.
manual transfer
replication
Replication done through transportable media instead of over a network. Used in cases
where the network link between replication partners is too slow or otherwise unsuitable for
transferring large amounts of data.
Manual Transfer Utility A stand-alone utility from Dell EqualLogic that performs volume replication using
transportable media, instead of the network. The utility has both graphical and command line
user interfaces.
Media Access Control
address (MAC address)
Your system's unique hardware number on a network.
migrate volume A Dell Compellent Storage Center command to move data from one volume to another.
migration In the context of EKM, combining a keystore into an existing keystore during (not after) Dell
Encryption Key Manager 3.0 installation.
mirror volume A Dell Compellent Storage Center command to replicate a local volume onto a remote Dell
Compellent Storage Center and maintain updates between the local and remote volumes
until the mirror is manually broken.
mirroring A type of data redundancy in which a set of physical drives stores data and one or more sets
of additional drives stores duplicate copies of the data. Mirroring functionality is provided by
software. See striping, RAID.
NAS See Network-Attached Storage.
network connection An object that defines a persona's and VMRack's required network connectivity. A network
connection is created as the result of adding elements to a network, for example when you
add a persona to a network.
Network-Attached
Storage (NAS)
NAS is one of the concepts used for implementing shared storage on a network. NAS
systems have their own operating systems, integrated hardware, and software that are
optimized to serve specific storage needs.
NTP The Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer
systems over packet-switched, variable-latency data networks.
Oversubscribed space In a SAN that supports thin provisioning, the amount of storage space that is configured as
available but not physically present (i.e., configured space minus available space).
parity stripe In RAID arrays, a striped hard drive containing parity data.
partition A physical section of a hard drive created using the fdisk command. Partitions can then be
divided into multiple logical drives using the format command.
passive Controller The Dell AIM Controller that acts as a hot standby, ready to take over managing the
environment if the active Controller fails.
Peer Controller In a dual-controller Dell Compellent Storage Center, the peer controller shares the I/O load
with the leader controller but does not perform external management functions. If the leader
controller fails, the peer controller assumes the I/O and management duties of both
controllers. See Leader Controller.
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persona A server environment captured on disk: the operating system, optional Dell AIM agent
software, and the network and other settings required to run an application on a host in the
Dell AIM environment.
pool Storage space in a SAN available for use by volumes. In Dell Compellent Enterprise Storage
Manager and Dell Compellent Storage Center, this is equivalent to the total space in the
SAN. In Dell EqualLogic PS Series arrays, this is equivalent to the total space on the
members of the specific pool.
pool administrator An account on a Dell EqualLogic PS Series group that has permission to manage objects
only in a specific pool or set of pools for a group. Compare to group administrator.
primary group Within the Dell EqualLogic Group Manager environment, the group containing the original
volume in a replication partnership. See secondary group.
primary volume Within the Dell EqualLogic Group Manager environment, a volume configured for replication
to a replication partner.
PS Series array A single Dell EqualLogic iSCSI storage unit, usually configured as a Dell EqualLogic PS
Series group. You can join multiple PS Series arrays into a larger PS Series group and
manage them as a single iSCSI SAN.
PS Series group An iSCSI storage entity comprised of one or more Dell EqualLogic PS Series storage arrays
that you access through a single IP address and manage as a storage area network (SAN).
Public Services In the context of Dell AIM, the Controller Services virtual IP address that you use to connect
to the Console or CLI on the active Controller.
RAC Remote Access Controller.
RAID See Redundant Array of Independent Disks.
RAID 0 Data is striped across the available disks providing improved performance. RAID 0 does not
provide any data redundancy.
RAID 10 Data is striped across available disk drives and mirrored, providing data availability and
improved performance. Maintains a minimum of one full copy of all data on the volume. RAID
10 provides optimum Read / Write performance, increased probability of withstanding
multiple failures, and the quickest restoration of data.
RAID 5 Maintains a logical copy of the data using a mathematically derived rotating parity stripe.
The parity stripe is derived from the data stripes. This method has less overhead for the
redundant information than RAID 10 however write performance is slower than RAID 10 due
to the calculation of the parity stripe for every write. Read performance is similar to RAID 10.
RAID 50 RAID level 50 is a combination of RAID level 5 and RAID level 0. RAID 50 includes both parity
and disk striping across multiple drives.
recovery volume A volume created for the purpose of recovering data. In Dell EqualLogic PS Series arrays, a
recovery volume is created by promoting an inbound replica set as part of a failover
operation. You can also create recovery template volumes and recovery thin clones. In Dell
Compellent Storage Center, a view volume is created from a replay. See replica, View
Volume, Replay.
Redundancy The duplication of information or hardware equipment components to ensure that if a
primary resource fails, a secondary resource can take over its function. Dell Compellent
Storage Center provides redundancy for each component so that there is no single point of
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failure. Single Redundancy protects against loss of data if any one resource fails. Dual
Redundancy protects against data lost if any two resources fail.
Redundant Array of
Independent Disks
(RAID)
Redundant array of independent disks. A method of providing data redundancy. Some
common implementations of RAID including RAID 0, RAID 1, RAID 5, RAID 10, and RAID 50.
See mirroring, striping.
Remote Instant Replay A Dell Compellent Storage Center solution feature in which a replay is replicated to a remote
Dell Compellent Storage Center. The local and remote Dell Compellent Storage Centers are
active-active, and bidirectional replication can occur, synchronously or asynchronously, on
independent intervals. Dell Compellent Storage Center replication requires the Enterprise
Manager software application with a Replication license. See Replay, Remote System,
replication.
Remote Setup Wizard
(RSW)
A graphical user interface (GUI) that enables you to configure a Dell EqualLogic PS Series
array after you install the Host Integration Tools/Microsoft Edition.
Remote System In Dell Compellent Storage Center, a separate SAN configured to receive replication data
from an original volume on the local Dell Compellent Storage Center. Dell Compellent
Storage Center replication requires the Enterprise Manager software application with a
Replication license. See replication.
Replay In Dell Compellent Storage Center, a fully usable, point-in-time copy (PITC) of data that
contains an image of the data as it appeared at the point in time at which the copy was
initiated. The copy may be stored locally or on a remote Dell Compellent Storage Center.
See snapshot, Data Instant Replay, Remote Instant Replay.
Replay Profile In Dell Compellent Storage Center, a set of rules that determine when and how replays point-
in-time copies will be taken and how long they will be saved. See Replay.
Replay space In Dell Compellent Storage Center, the amount of space that is automatically reserved and
used for replays. See active space, actual space.
replica A point-in-time representation of a Dell EqualLogic PS Series volume. The original volume
and its replica are located on different Dell EqualLogic PS Series groups (replication
partners) potentially separated at some geographical distance to facilitate disaster
tolerance.
replica collection In Dell EqualLogic Group Manager, the set of replicas resulting from each replication of a
volume collection.
replica collection set In Dell EqualLogic Group Manager, the set of replica collections for a volume collection.
replica reserve In Dell EqualLogic Group Manager, the portion of the delegated space on a replication
partner that is set aside for the replica sets for a specific volume. You configure the replica
reserve for the volume on the primary group, but the actual replica reserve is on the
secondary group.
replica set In Dell EqualLogic Group Manager, the set of complete replicas for a volume, template
volume, or thin clone volume.
replicating system A Dell Compellent Storage Center configured to send replication data from one or more local
volumes to a remote Storage Center. See replication, Remote System, Remote Instant
Replay.
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replication The process of copying volume data (only deltas) from the primary (local) SAN to a
secondary (remote) SAN, so that data can be recovered from either SAN if necessary. The
SANs can be an unlimited distance apart.
replication partner In Dell EqualLogic Group Manager, a group that is configured to send or receive replicas
from another partner.
RSW See Remote Setup Wizard.
runnable persona In the context of Dell AIM, a network-booted persona that is started and is waiting to be
assigned to a host.
SAN See Storage Area Network.
SAN HeadQuarters Enables you to monitor multiple Dell EqualLogic PS Series groups from a single graphical
interface. It gathers and formats performance data and other important group information.
SCN See System Control Network.
SCN Services The Controller Services virtual IP address that personas and VMRacks in the Dell AIM
environment use to communicate with the active Controller.
SCSI See Small Computer System Interface.
SDK See Software Development Kit.
secondary control
module
Within the Dell EqualLogic Group Manager environment, the secondary control module
mirrors cache data from the active control module. If the active control module ceases to
function, the secondary takes over network operations. See active control module.
secondary group In a Dell EqualLogic Group Manager replication configuration, the group that receives
replicas of a source volume. See primary group.
Server Cluster A group of independent servers working together as a single system to provide uninterrupted
service in the event of individual computer failures.
service tag A label on the system used to identify it when you call Dell for technical support.
Simple Mail Transfer
Protocol (SMTP)
Defines a message format and forwarding procedure to enable messages to be sent
between hosts on the Internet.
Simple Network
Management Protocol
(SNMP)
A standard interface that allows a network manager to remotely monitor and manage
workstations.
Simulator A component of the Dell AIM SDK that emulates a running Dell AIM environment, including
the Controller, the Console, and physical and virtual networks. See SDK.
Small Computer System
Interface (SCSI)
Small computer system interface. An I/O bus interface with faster data transmission rates
that standard ports.
SMART Self-Monitoring Analysis and Reporting Technology. Allows hard drives to report errors and
failures to the system BIOS and then display an error message on the screen.
Smart Copy An ASM/ME point-in-time, application-consistent copy of objects in a Dell EqualLogic PS
Series group. Smart Copies can be of type snapshot, clone, or replica depending on the
edition of Auto-Snapshot Manager that you are using.
SMP See symmetric multiprocessing.
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SMTP See Simple Mail Transfer Protocol.
snapshot A point-in-time copy (PITC) of a volume. See Replay.
snapshot collection A set of snapshots resulting from a snapshot operation on a volume collection. See volume
collection.
SNMP See Simple Network Management Protocol.
SNMP Trap Collector In the context of Dell AIM, the Controller Services virtual IP address that managed switches
and other devices use to send SNMP traps to the active Controller.
Software Development
Kit (SDK)
A set of development tools used to create applications for a specific software package,
software framework, hardware platform, computer system, video game console, operating
system, or similar platform.
Space Recovery A utility that recovers space that Windows reports as being used but is actually empty,
available space that can be used by Dell Compellent Storage Center.
spare disk A designated or unused drive in a SAN that is used automatically to replace a failed drive.
Storage Area Network
(SAN)
A storage area network (SAN) is a specialized network that provides access to high
performance and highly available storage subsystems using block storage protocols. The
SAN is made up of specific devices, such as host bus adapters (HBAs) in the host servers,
switches that help route storage traffic, and disk storage subsystems. The main
characteristic of a SAN is that the storage subsystems are generally available to multiple
hosts at the same time, which makes them scalable and flexible. Compare with NAS.
Storage Cluster In Dell Compellent Storage Center, multiple SAN controllers that are interconnected for the
purpose of improving reliability, availability, serviceability and performance (via load
balancing). Storage Center uses an active-active configuration to provide automatic
controller failover. A fully mirrored, battery-backed cache in each controller ensures data
reliability over a restart and allows volumes to migrate between controllers in the event of a
single controller failure.
Storage Clustering A Dell Compellent Storage Center feature that provides automatic controller failover through
multiple controllers in an active-active configuration. Fully mirrored, battery backup cache
provides fault tolerance and automatic restart/recovery in the event of a controller failure.
Storage Pool See pool.
Storage Profile In Dell Compellent Storage Center, a set of rules that define the drive types (tiers) on which
to store data and the RAID level to use for each tier.
Storage Type In Dell Compellent Storage Center, a set of attributes, including redundancy options and
block size, that control how space from a storage pool is allocated and protected.
striping Disk striping writes data across three or more disks in an array, but only uses a portion of the
space on each disk. The amount of space used by the "stripe" is the same on each disk
used. A virtual disk may use several stripes on the same set of disks in an array. See also
mirroring, and RAID.
symmetric
multiprocessing (SMP)
Used to describe a system that has two or more processors connected via a high-bandwidth
link and managed by an operating system, where each processor has equal access to I/O
devices.
synch See Synchronous Replication.
15
Synchronous
Replication
Feature that atomically writes the same data to two separate volumes, stored on different
physical hardware, before the application receives an I/O complete message. Both writes
either complete or fail, so both volumes are fully synchronized at all times. However, the
feature can increase write latency for the application. See synch.
System Control
Network (SCN)
A private network that Dell AIM uses for communication between the Controller, personas,
and VMRacks. The Controller also uses this network to discover servers and to boot
personas and VMRacks on them.
System Setup program A BIOS-based program that allows configuration of a system's hardware and customization
of the system's operation by setting features such as password protection. Because the
System Setup program is stored in NVRAM, any settings remain in effect until changed.
Systems Deployment
Appliance
A Dell KACE appliance-based deployment management solution for IT professionals that
provides tools for disk imaging, user state migration, remote site management, system repair
and recovery, as well as computer inventory scanning and assessment. Additionally, it
automates pre-and post-deployment configuration tasks such as computer inventory
scanning and assessment; it also automates disk, BIOS, and RAID configuration, software
distribution, and configuration management.
Systems Management
Appliance
A Dell KACE appliance-based systems management solution for IT professionals that
streamlines tasks such as inventory management, software distribution, reporting, patch
management, asset management, scripting, and service desk support through a web-based
interface.
template In the context of Dell AIM, a dormant persona that you can clone to create other personas,
but which you can't run (to prevent changes to the template).
template volume Read-only volume from which you create thin clones.
thin clone Volume that shares space with a template volume. Thin clones provide an efficient use of
storage space for configurations with multiple volumes that have a large amount of common
data.
Thin Provisioning Feature that lets you over-provision (or over-subscribe) the space available in the SAN.
Storage objects (such as volumes) that use thin provisioning report their potential maximum
size to applications, but may actually use much less space. Thin provisioning allows
organizations to reduce their overall storage expenditures, increase availability and achieve
greater performance.
tiered storage Storage optimization strategy in which data required quickly and often is stored on
expensive, fast media types, and data required rarely is stored on less expensive, slower
media types.
unmanaged space In Dell EqualLogic PS Series arrays, delegated space capacity on the secondary group that
is no longer accessible from the primary group.
uplink port A port on a network hub or switch used to connect to other hubs or switches without
requiring a crossover cable.
vacate In Dell EqualLogic Group Manager, to remove a member from a group while the member
remains online.
View Volume In Dell Compellent Storage Center, a read-only volume that has been created from a previous
replay, for the primary purpose of recovering data. See Replay.
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Virtual Port or Virtual
Port Mode
In the context of Dell Compellent Storage Center, Virtual Ports eliminate the need for reserve
ports. When operating in Virtual Port mode, all front-end ports accept I/O and can be part of
one Fault Domain. For information on enabling Virtual Ports, refer to the Dell Compellent
Storage Center System Setup Guide.
virtual World Wide Port
Name (vWWPM)
A virtual World Wide Port Name used in Dell AIM for creating SAN-booted personas.
Virtualization The ability to use software to share the resources of a single computer or storage device
across multiple environments. A single physical system or device may appear to the user as
multiple virtual systems able to host multiple operating systems.
VMRack A rack of virtual machines (VMs) on a server that is running a combination of agent software
and Red Hat Xen, VMware ESX, or Microsoft Hyper-V.
volume A discrete unit of storage striped to a storage device or devices.
volume collection A number of volumes grouped together for purposes of performing operations on the
volumes simultaneously. See snapshot collection, replica collection.
volume reserve Amount of space allocated to a volume from free pool space. Without thin provisioning,
volume reserve is the same as reported size.
Volume Type In the context of Dell Compellent Storage Center, Volume Type: can be dynamic, Replay
enabled, or Replication. A volume is dynamic until at least one Replay has been taken of that
volume. Once a Replay has been taken of a volume, it becomes Replay Enabled. A
Replication volume is one that is being Replicated to another Dell Compellent Storage Center
system.
vRack In the context of Dell AIM, a logical group of hosts connected to a virtual switch (vRack
switch).
vRack switch In the context of Dell AIM, a virtual switch that connects hosts in a vRack.
vWWPN See virtual World Wide Port Name.
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