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Configuring RAID recovery
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RAID recovery mode of ZAR 8.3 is used to recover data
when the array configuration (such as stripe size, or the order of the
array member disks) is lost. If you determine the situation involves
RAID reconstruction, select the appropriate mode in
Task types. The drives should be accessible as a
separate devices. This means you should either connect them to the
regular (non-RAIDed) ports, or reconfigure the RAID controller as
required to provide access to the drives independently. |
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Select disks which are members of the array. If the array is RAID5 with one
disk missing, select all available array members - the missing disk will be
reconstructed based on the RAID5 parity data. |
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Generally, search for a RAID0 is cheaper than for a RAID5. Worst case
overhead is to search for a RAID5 when there isn't one (parity will be
recalculated out of the anticipation that one of the member disks is missing,
which is costly in terms of execution time).
- If you know the array is RAID0, clear all RAID5 derivatives in the
"Possible Layouts" box.
- If one disk is missing from a RAID5 array, mark all the available
members of the array. The missing disk will be reconstructed automatically.
- When not sure to choose either "LDM" or "Checkerboard" RAID5 layout,
select both.
- Avoid ordering to search the drive that was not a member of the array.
This is especially important in case of a RAID5, because an additional drive
will cause parity recalculation, resulting in even more disks to search, and
the algorithm might get lost in all the possibilities.
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Copyright © 2001-2008 Zero Assumption Recovery
[Data recovery forum]
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