IBM DS8000 Storage area network, Storage capacity, Storage complex, Storage device, Storage image

storage area network

A network that connects a company’s heterogeneous storage resources.

storage capacity

The amount of data that a storage medium can hold; usually expressed in kilobytes, megabytes, or gigabytes.

storage complex

A configuration of one or more storage units that is managed by a management console.

storage device

A physical unit that provides a mechanism to store data on a given medium such that it can be subsequently retrieved. See also disk drive module.

storage extent

The minimum contiguous range of storage on a physical storage device, array, or rank that can be allocated to a local volume

storage image

A partitioning of a storage unit that provides emulation of a storage server with one or most storage devices that provides storage capability to a host computer. You can configure more than one storage image on a storage unit.

storage server

A physical unit that manages attached storage devices and provides an interface between them and a host computer by providing the function of one or more logical subsystems. The storage server can provide functions that the storage device does not provide. The storage server has one or more clusters.

storage unit

A physical unit that consists of a storage server that is integrated with one or more storage devices that provide storage capability to a host computer.

storage unit identifier

A unique identifier for a storage unit that consists of a manufacturer, a model number, a type number, a plant of manufacture, and a sequence number.

striping

A technique that distributes data in bit, byte, multibyte, record, or block increments across multiple disk drives.

subagent

An extension to an SNMP agent that permits a user to dynamically add, or in some cases replace, additional management variables in the local MIB, thereby providing a means of extending the range of information that network managers can access. See also agent.

subchannel

A logical function of a channel subsystem associated with the management of a single device.

subordinate storage unit

The physical unit that receives commands from the master storage unit and is specified when a Global Mirror session is started. The subordinate storage unit forms consistency groups and performs other Global Mirror processing. A subordinate storage unit can be controlled by only one master storage unit. Contrast with master storage unit.

subsystem identifier (SSID)

A number that uniquely identifies a logical subsystem within a computer installation.

support catcher See catcher.

support catcher telephone number

The telephone number that connects the support catcher server to the DS8000 to receive a trace or dump package. See also support catcher and remote technical assistance information network.

switched fabric

A fibre-channel topology in which ports are interconnected through a switch. Fabric switches can also be interconnected to support numerous ports on a single network. See also arbitrated loop and point-to-point connection.

symmetrical multiprocessor (SMP)

An implementation of a multiprocessor computer consisting of several identical processors configured in a way that any subset of the set of processors is capable of continuing the operation of the computer. TheDS8000 contains four processors set up in SMP mode.

synchronous write

A write operation whose completion is indicated after the data has been stored on a storage device.

Glossary 349