nStor Corporation Ultra S2S User Manual page 19

Controlling Physical Drive States
The state of a physical drive refers to a SCSI drive's current operational status. At
any given time, a SCSI drive can be in one of several states: Ready, Online,
Standby, Rebuild, Dead, Format, or Unformatted. The operational status of a disk
drive is indicated by a three-letter status code.
The controller stores the state of the attached SCSI drives in its non-volatile
memory as well as on the disks. This information is retained even after the power
is turned off.
These drive states are defined as:
Ready (RDY) – a disk drive is operational but not currently included in a
drive group.
Online (ONL) – a disk drive is powered, has been defined as a member of a
drive group, and is operating properly.
Standby (SBY) – a disk drive is powered, able to operate properly, has not
been defined as part of any drive group, and has been defined to replace any
failed/removed ONLINE drive.
Dead (DED) – a disk drive is not present, is present but not powered on, or
fails to operate properly and is killed by the controller (whether or not it has
been defined as a member of a drive group).
Rebuild (RBL or WOL) – a disk drive is in the process of being rebuilt
a) during a RAID 1 rebuild, data is being copied from the mirrored drive
to the replacement drive or
b) during a RAID 3, RAID 5, or RAID 0+1 rebuild, data is being
regenerated via the XOR redundancy algorithm and written to the
replacement drive.
NOTE: RBL is displayed when a VT100 terminal is used and WOL for the
AdminiStor PC Utilities (RAIDfx)
Format (FMT) – displayed when a disk drive is being formatted.
Unformatted (UNF) – displayed when a disk drive needs to be formatted.
Introduction
9
Drive Management