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SCSI
See small computer system interface.
SCSI initiator ID
In a failover or clustering environment, the ID assigned to a SCSI controller. Each
ServeRAID controller and its partner must have different SCSI initiator IDS; one
must be 6 and the other 7.
SCSI-transfer speed
The speed at which data can be transferred between a physical drive and the
ServeRAID controller.
segment
Disk drive or portion of a disk drive used to create a logical drive. A disk can
include RAID segments and available segments. A RAID segment is part of a
logical drive; it can be used by only one logical drive at a time. Available segments
can be used to define a new logical drive. If the disk is not part of any logical
drive, the entire disk is an available segment.
ServeRAID Manager
A program used to configure ServeRAID controllers, view the ServeRAID Manager
configuration, create arrays and logical drives, delete arrays, dynamically increase
the logical-drive size, change RAID levels, and more.
shared drives
The physical drives controlled by a cluster or failover pair.
small computer system interface
A standard hardware interface that enables a variety of peripheral devices to
communicate with one another.
spanned array
An array of arrays. Used in RAID level-00, level-10, level-1E0, and level-50 to
permit the use of larger numbers of physical drives. The spanned array contains
arrays, each of which contains a sub-logical drive, which can be RAID level-0,
level-1, level-1E, or level-5. The RAID-level for the logical drive contained within
the spanned array is 0.
standby hot spare
A hot-spare physical drive that the ServeRAID controller has spun down. If an
online drive becomes defunct and no suitable hot-spare drive is available, a
standby drive of the appropriate size automatically spins up and enters the rebuild
state.
stripe-unit size
The granularity at which data is stored on one drive of the array before subsequent
data is stored on the next drive of the array. The performance of a ServeRAID
controller is maximized if the stripe-unit size is close to the size of the system
input/output requests.
Appendix B. Glossary 271