IBM ServeRAID-4 Ultra160 Series User Reference page 43

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:
page 147.
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
v Three or more drives in a RAID level-5E logical drive are defunct.
If any of these is true, refer to "Rebuilding a defunct drive" on page 147.
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 a defunct drive" on
are defunct.
Chapter 3. Understanding RAID technology
25