HP StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide (AA-RPHZF-TE, March 2004)

Glossary
249Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
SCSI device
1. A host computer adapter, a peripheral controller, or an intelligent peripheral that can be attached to the SCSI
bus.
2. Any physical unit that can communicate on a SCSI bus.
SCSI device ID number
A bit-significant representation of the SCSI address referring to one of the signal lines, numbered 0 through 7
for an 8-bit bus, or 0 through 15 for a 16-bit bus.
SCSI ID number
The representation of the SCSI address that refers to one of the signal lines numbered
0 through 15.
snapshot
A snapshot unit is one that reflects the contents of another unit at a particular point in time. It is a virtual copy
and not a physical copy of the source device at a point in time.
See also unit.
storage array
An integrated set of storage devices. Storage arrays can be manipulated as one unit.
storage unit
The general term that refers to storagesets, single-disk units, and all other storage devices that are installed in a
subsystem and accessed by the host. A storage unit can be any entity that is capable of storing data, whether it is
a physical device or a group of physical devices.
storageset
1. A group of devices configured with RAID techniques to operate as a single container.
2. Any collection of containers, such as stripesets, mirrorsets, striped mirrorsets, JBODs, and RAIDsets.
subnet mask
Also known as address mask. A subnet is an IP network that can be reached through a single IP address. All the
members of the subnet share the mask value. Members of the subnet can then be referenced more easily. A
subnetwork is a network that is part of another network, connected through a gateway, bridge, or router.
surviving controller
The controller in a dual-redundant configuration pair that serves its companion’s devices when the companion
controller fails.
SWCC
An acronym for StorageWorks Command Console.
synchronous mode
A mode of operation of the remote copy set whereby the data is written simultaneously to the cache of the
initiator subsystem and the cache of the target subsystem. The I/O completion status is not sent until all
members of the remote copy set are updated.
See also asynchronous mode.
target
A SCSI device that performs an operation requested by another SCSI device, namely the SCSI initiator. The
target number is determined by the device's address on its SCSI bus.
For subsystems using the disaster-tolerant Data Replication Manager solution, data processing occurs at the
initiator site and the data is replicated or mirrored to the target site. In the event of a system outage, the data is
recovered from the target system.
See also initiator.