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Checking Parity
Parity checking is the process where the
integrity of redundant data on fault-tolerant logical drives (RAID 1,
3, and 5) is checked. Depending on which options you select, the parity can be overwritten and any error reported as an event.
- Select the logical drive on which you
want to run the parity check.
- Choose Array Administration > Parity
Check.
NOTE: You need to be logged
in as either ssadmin or ssconfig to access options
on this menu.
- When the Logical Drive Parity Check
window is displayed, select one or more logical drives for parity
checking.
To run a parity check on multiple drives,
use the Array Administration > Schedule Parity Check command
to schedule a parity check for multiple logical drives in the near
future (such as within three minutes). When the scheduled parity check
runs, it automatically performs the parity checks one after another.
- Select from the following options:
- Regenerate - For RAID 3 and 5 configurations, the parity checking
procedure on a logical drive recalculates the parity of data stripes
in each of the logical drives RAID stripe sets and compares it
with the stored parity. If a discrepancy is found, the new correct parity is substituted for the stored parity. For RAID 1 configurations, if an inconsistency is encountered, data is copied from the master disk to the slave disk. If a bad block is encountered when the parity is regenerated, the data is copied from the other disk,
master or slave, to the reporting disk drive reallocating the bad block.
NOTE: If you select Regenerate, make sure Generate Error Event is also selected.
- Generate Error Event (default) - When a parity check is run and a discrepancy is found, an error is reported, which enables you to analyze the error and check the integrity of your data before overwriting the parity drive.
CAUTION: If an array's data parity is seriously damaged, restoring data by regenerating might cause data loss. Only select Regenerate after you have performed any necessary data recovery based on the parity check errors.
- Click the Parity Check button
to start the parity check process.
Once a parity check has started, the
Progress Indicator is automatically displayed. If this window
is closed, it can be reopened by choosing View > Array Admin Progress,
or by clicking the Progress Indicator icon. A window is displayed
that shows the percentage of completion progress for each array.
To stop the parity check, click Cancel.
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