HP Insight Management Agents - Manual (Page 90)

SCSI logical drives
Select a SCSI logical drive from the SCSI controller submenu to display the following information.
The following values are valid:
• Status—Shows the status of the physical drive selected.
— OK—The logical drive is in normal operation mode. No user action is required.
— Failed—There are more failed physical drives than the fault tolerance mode of the logical
drive can handle without data loss.
— Unconfigured—The logical drive is not configured. Run the logical drive configuration
utility to configure the logical drive.
— Recovering—The logical drive is using Interim Recovery Mode. In Interim Recovery
Mode, at least one physical drive has failed, but the logical drive’s fault tolerance mode
lets the logical drive continue to operate with no data loss. You should replace the failed
drive as soon as possible.
— Ready for Rebuild—The logical drive is ready for Automatic Data Recovery. The physical
drive that failed has been replaced, but the logical drive is still operating in Interim
Recovery Mode.
— Rebuilding—The logical drive is currently re-synchronizing the data across the physical
drives in the logical drive.
— Wrong Drive—The wrong physical drive was replaced after a physical drive failure.
You must return the drive incorrectly replaced and replace the failed drive.
— Bad Connection—A physical drive is not responding. Check the cables connecting the
physical drive.
— Degraded—The logical drive is in a degraded state.
— Disabled—The logical drive is disabled. The logical drive configuration utility can
enable or disable the logical drive. • Unknown—The Storage Agents cannot determine
the status of this drive. You might need to upgrade your driver software or Storage
Agents.
• Capacity—Displays the size of the logical drive.
• Fault Tolerance—Displays the fault tolerance mode of the logical drive. The following values
are valid:
— None—(RAID 0) fault tolerance is not enabled. If a physical drive reports an error, the
data cannot be recovered.
— Mirroring—(RAID 1/RAID 0+1) is the highest level of fault tolerance. It is the only
method offering fault tolerance protection if no more than two physical drives are
selected. Drive mirroring creates fault tolerance by storing duplicate data on two drives.
There must be an even number of drives. This is the most costly fault tolerance method
because it requires 50 percent of the drive capacity to store the redundant data.
— Data Guarding—(RAID 4) assures data reliability while using only a small percent of
the logical drive storage capacity. A designated, single physical drive contains parity
data. If a drive fails, the controller uses the data on the parity drive and the data on the
remaining drives to reconstruct data from the failed drive. This allows the system to
continue operating with slightly reduced performance until you replace the drive.
— Distributed Data Guarding—(RAID 5) stores parity data across all the physical drives
in the array and allows more simultaneous read operations and higher performance
than data guarding (RAID 4). If a drive fails, the controller uses the parity data and the
data on the remaining drives to reconstruct data from the failed drive. The system then
continues operating with a slightly reduced performance until you replace the failed
drive.
— Enhanced Mirroring—(RAID 1E) is used when there are more than two physical disks.
Each mirrored stripe is written to a disk and is mirrored to an adjacent disk. If a failure
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