3Ware 9650SE-2LPML User Manual page 161

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A RAID 6 unit can have two simultaneous drive failures, before becoming
inoperable.
When a RAID 5 or RAID 6 is running in Degraded mode and you rebuild it,
the missing data is reconstructed from all functioning drives.
Note:
If a rebuild fails, check the Alarms page for the reason. If there was an ECC
error on the source disk, you can force the rebuild to continue by checking the
Overwrite ECC Error policy on the Controller Settings page in 3DM and then
running Rebuild again. This will cause uncorrectable blocks to be rewritten, but the
data may be incorrect. It is recommended that you execute a file system check
when the rebuild completes. Under Windows, you can do this by right-clicking on
Properties
the Drive and choosing
Under Linux or FreeBSD use
Rebuilding a Unit Through 3DM
When a drive on a unit becomes defective, you replace it with an available
drive and then rebuild the unit. For units on 9550SX, 9590SE, and 9650SE
controllers, if Auto Rebuild is enabled and a drive is available, starting the
rebuild is optional as it will start automatically.
To rebuild a unit through 3DM
1 If necessary, add a new drive to replace the failed drive. (For details, see
"Adding a Drive" on page 129.)
2 In 3DM, choose Management > Maintenance
3 In the Unit Maintenance
degraded unit and click the
4 When a dialog box displays available drives, select the drive you want to
replace the failed drive and click
Figure 62. Selecting a Drive when Rebuilding
5 If the degraded unit has more than one failed drive (for example, a RAID
10 where both mirrored pairs each have a failed drive), repeat step 3 and
step 4 to select another drive.
If rebuild scheduling is not enabled on the
process begins almost immediately in the background. If rebuild
Tools
; then on the tab, click
.
fsck /dev/sda1
.
section of the Maintenance page, select the
Rebuild Unit button.
.
OK
Scheduling
Background Tasks
Check Now
.
page, the rebuild
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