IBM Netfinity ServeRAID-4L Ultra160, User Reference

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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: If the state of the logical drive is critical, refer to “Rebuilding
a defunct drive” on page 68.
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 is true, refer to “Rebuilding a defunct drive” on page 68.
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).
Chapter 3. Understanding RAID technology
19