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Chapter 8
Troubleshooting Your Array
8-3
8.3
Rebuilding Logical Drives
This section describes automatic and manual procedures for rebuilding logical
drives.
Note –
As disks fail and are replaced, the rebuild process regenerates the data and
parity information that was on the failed disk. However, the NVRAM configuration
file that was present on the disk is not re-created. After the rebuild process is
complete, restore your configuration as described in
(NVRAM) From a File” on page 7-24
.
8.3.1
Automatic Logical Drive Rebuild
Rebuild with Spare.
When a member drive in a logical drive fails, the controller first
examines whether there is a local spare drive assigned to this logical drive. If yes, it
automatically starts to rebuild the data of the failed disk to it.
If there is no local spare available, the controller searches for a global spare. If there
is a global spare, it automatically uses it to rebuild the logical drive.
Failed Drive Swap Detect.
If neither a local spare drive nor a global spare drive is
available, and the “Periodic Auto-Detect Failure Drive Swap Check Time” is
disabled, the controller does not attempt to rebuild unless you apply a forced-
manual rebuild.
To enable this feature, follow these steps:
1. Choose “view and edit Configuration parameters
→
Drive-side SCSI Parameters
→
Periodic Auto-Detect Failure Drive Swap Check Time.”
When the
“
Periodic Auto-Detect Failure Drive Swap Check Time
”
is enabled (that is,
when a check time interval has been selected), the controller detects whether the
failed drive has been swapped by checking the failed drive's channel/ID. Once the
failed drive has been swapped, the rebuild begins immediately.
Note –
This feature requires system resources and can impact performance.
If the failed drive is not swapped but a local spare is added to the logical drive, the
rebuild begins with the spare.
For a flowchart of automatic rebuild, see
Summary of Contents for StorEdge 3000 Series
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