Rebuilding Logical Drive - NEC Express5800 Series User Manual

3.12 Rebuilding Logical Drive

The rebuild can recover redundancy when a single HDD is defected in the RAID level of 1, 10,
or 5.
During rebuild, data read and write operations are enabled. However, the redundancy is lost
until the rebuild is completed.
If a HDD is defected, the logical drive including the HDD is entered into the critical state,
which is notified.
IMPORTANT:
Automatic start of rebuild
The rebuild process for a logical drive in the critical state is automatically started under the
following conditions:
[Automatic Rebuild
Policy] in Controller –
Settings tab
Spare
Free&Spare
(*1: Used in the ascending order of port numbers.)
IMPORTANT: Please make sure that Auto Rebuild
Status is set to "Enable" in Controller- Settings tab to
enable automatic start of rebuild. For details, see the
description of the Settings tab in "3.6.1 Controller."
If there is no spare drive and free HDDs attached to
the controller, please be sure to set Auto Rebuild
Status to Disable. If Enable, you will not able to see
the Port ID of the failed HDD in its event message
when a logical drive goes degraded.
The progress percentage in the following message
may change to incorrect value when you click Pause
while the pregress is 0%.
Rebuild on logical drive "%s" paused at %d%%.
This message is also registered in the system event
log.
During rebuild, the system is subject to much load and
thus the processing rate is decreased.
Existing spare disk
Using this disk, rebuild
is automatically
started.
Used for rebuild at the
highest priority.
New disk substituting
for defected disk
Not used for rebuild.
Rebuild is
automatically started if
this disk is set to
spare.
Used for rebuild (*1).
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Existing unconfigured
disk
Not used for rebuild.
Rebuild is
automatically started if
this disk is set to
spare.
Used for rebuild (*1).