Scheduling Background Tasks - 3Ware 8006-2LP Manual

3DM Disk Management Utility
the source disk. Uncorrectable blocks will be rewritten, but the data may be
incorrect. It is recommended that a file system check is executed when the
rebuild completes. By default, this function is disabled. Select this option only
if the initial rebuild has failed because of an ECC error on the source disk. The
reason that a rebuild failed is posted in the Alarms page of 3DM.

Scheduling background tasks

The 3DM Configuration display allows routine maintenance of storage
media by scheduling array rebuilds, initialization, array verifications and
media scans. The background tasks selected are only performed during the
scheduled time. Depending on the schedule and system workload, back-
ground tasks may require more than one scheduled duration to complete. The
day of the week (or daily) time and duration to perform the selected back-
ground tasks can be specified using the pull-down menus. When finished, be
sure to click on the Save Schedule button to confirm the entries.
Background Task Features
Selecting the Rebuild/Initialize feature forces rebuilds and initialization to be
performed only during the time specified by the schedule. If this feature is not
selected, rebuilds and initialization can operate anytime they are required.
This feature affects only redundant arrays (RAID 1, 5 and 10).
The Verify feature verifies the redundancy of all RAID 1, 5 and 10 arrays.
The Media Scan feature continuously scans all drives (including hot-spares)
for media errors.
Examples of Background Task Priorities
The following examples assume the scheduled duration is four hours.
Only Verify is selected: The verification operation is performed during the
scheduled window. If the operation completes with time remaining in the
window, the operation begins again on the same array (if there is only one
array) or continues on to additional redundant arrays. The verify opera-
tion stops when the duration in the scheduled window completes.
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Rebuild/Initialize operations preempt Verify and Media Scan
Note:
operations. If a rebuild or initialization is required, it will be per-
formed before Verify and Media Scan during the scheduled win-
dow.
Tasks cannot be performed in time increments of less than one
hour. For example, if both Verify and Media Scan are selected and
the scheduled window is five hours, the verify operation is per-
formed during the first three hours and the media scan follows dur-
ing the remaining two hours.
3ware Escalade ATA RAID Controller User Guide