IBM Netfinity ServeRAID-4H Ultra160 User Reference page 25

Drive State Meaning
Ready The ServeRAID controller recognizes a ready drive as being available for
definition.
Standby Hot A standby hot spare is a hot-spare drive that the ServeRAID controller
Spare has spun down. If an online drive becomes defunct and no suitable
hot-spare drive is available, a standby hot-spare drive of the appropriate
size automatically spins up, and enters the rebuild state.
Logical drive state descriptions
The following table provides descriptions of the valid logical drive states.
Drive State Meaning
Blocked During a rebuild operation, the ServeRAID controller sets the state of any
RAID level-0 logical drives associated with a failed array to the blocked
state; then, it reconstructs the data that was stored in RAID level-1, RAID
level-1E, RAID level-5 and RAID level-5E logical drives.
After the rebuild operation completes, you can unblock the RAID level-0
logical drives, and access them once again. However, the logical drive
might contain damaged data. You must either re-create, reinstall, or
restore the data from the most recent backup disk or tape to the RAID
level-0 logical drive.
Critical Migrating A logical drive in the critical state that is undergoing a logical drive
migration (LDM).
Critical System The ServeRAID controller uses this reserved state during a logical drive
migration (LDM) when the logical drive is in the critical state.
Critical A RAID level-1, RAID level-1E, RAID level-5, or RAID level-5E logical
drive that contains a defunct physical drive is in the critical state. A
critical logical drive is accessible, despite a physical drive failure.
Attention:
a defunct drive" on page 136.
Migrating The logical drive is undergoing a logical drive migration; that is, a change
in RAID levels, a change in logical drive size, an increase in free space,
or a RAID level-5E compression or decompression.
Offline The logical drive is offline and not accessible. This state occurs when
one of the following is true.
v One or more physical drives in a RAID level-0 logical drive are
defunct.
v Two or more physical drives in a RAID level-1, RAID level-1E, or RAID
level-5 logical drive are defunct.
v Three or more drives in a RAID level-5E logical drive are defunct.
If any of these are true, refer to "Rebuilding a defunct drive" on page 136.
Okay The logical drive is okay. It is in a good, functional state.
System The ServeRAID controller uses this reserved state during logical drive
migration (LDM).
If the state of the logical drive is critical, refer to "Rebuilding
Chapter 1. Getting started
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