Avago Technologies AcceleRAID 170LP - Manual (Page 83)

Glossary
Manual No. DB11-000024-00 G-25
memory. This information is retained even after power-off. Hence, if a SCSI
disk is labeled “dead” in one session, it will stay in the “dead” state until a
change is made either by using a system level utility or after a rebuild. Each
state is described below.
Ready: A SCSI disk drive is in a “ready” state if it is powered on and is
available to be configured during the current session but remains
unconfigured.
Online: A SCSI disk drive is in an “online” state if is powered on, has been
defined as a member of a drive group, and is operating properly.
Standby: A SCSI disk drive is in a “standby” state if it is powered on, is able
to operate properly, and was
NOT defined as part of any drive group.
Dead: A SCSI disk drive is in a “dead” state if it is not present, if it is present
but not powered on, or if it failed to operate properly and was “killed” by the
controller. When the controller detects a failure on a disk, it “kills” that disk
by changing its state to “dead.” A “dead” SCSI drive can also be present and
powered on, but a SCSI drive in a “dead” state does not participate in any I/O
activity; no commands are issued to dead drives.
Rebuild: A SCSI disk drive is in a “rebuild” state while it is in the process of
being rebuilt. During this process, data is regenerated and written to the disk
drive. This state is also referred to as “Write-Only (WRO).”
SCSI Interrupt Steering Logic (SISL)
Architecture that allows a RAID controller, such as AcceleRAID 150, 200 or
250, to implement RAID on a system board-embedded SCSI bus or a set of
SCSI busses.
Server
A computer program that provides and manages services to other computer
programs on the same or other computers. The computer that a server
program runs on is also frequently referred to as a server. See also
Application Server.
SES
SCSI Enclosure Services, a standard for SCSI access to services within an