Appendix B. Terminology 833
Small Computer System Interface (SCSI)
Small Computer System Interface (SCSI) is an ANSI-standard electronic interface with which
personal computers can communicate with peripheral hardware, such as disk drives, tape
drives, CD-ROM drives, printers, and scanners, faster and more flexibly than with previous
interfaces.
Snapshot
A snapshot is an image backup type that consists of a point-in-time view of a volume.
Solid-state disk
A solid-state disk (SSD) or Flash Disk is a disk that is made from solid-state memory and
therefore has no moving parts. Most SSDs use NAND-based flash memory technology. It is
defined to the Storwize V5000 as a disk tier generic_ssd.
Space efficient
See “Thin provisioning” on page 834.
Spare
An extra storage component, such as a drive or tape, that is predesignated for use as a
replacement for a failed component.
Spare goal
The optimal number of spares that are needed to protect the drives in the array from failures.
The system logs a warning event when the number of spares that protect the array drops
below this number.
Space-efficient volume
For more information about a space-efficient volume, see “Thin-provisioned volume” on
page 834.
Stand-alone relationship
In FlashCopy, Metro Mirror, and Global Mirror, relationships that do not belong to a
consistency group and that have a null consistency-group attribute.
Statesave
Binary data collection that is used for a problem determination by IBM service support.
Storage area network or SAN
A storage area network (SAN) is a dedicated storage network that is tailored to a specific
environment, which combines servers, systems, storage products, networking products,
software, and services.
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