Scsi logical drives – HP ProLiant DL380 G5 Server User Manual
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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 in megabytes. A megabyte is 1,048,576 bytes. Drive
manufacturers sometimes use the number 1,000,000 as a megabyte when giving drive capacities so this value
might differ from the advertised size of a 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 is detected, the data is rebuilt using the
data from the mirrored stripes on the other drives.
•
Unknown—The Storage Agents cannot determine the fault tolerance of this logical drive. You might need to
upgrade your driver software or Storage Agents.
•
Stripe Size—The size of a logical drive stripe or group of data written to a physical drive in kilobytes. It might
be zero in some fault-tolerance modes like None and Mirroring.
•
Percent Rebuild Complete—Displays the percent complete of the resynchronization of the data. When the value
reaches 100, the rebuilding process is complete. The logical drive continues to operate with slightly reduced
performance during the rebuild. This value is only active when the logical drive has a status of Rebuilding.
Physical drives
A list of physical drives that are members of this logical drive. Select one of the listed physical drives to see more
information about the drive.
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