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Qsan Document – User Manual
Configuration
When creating a virtual disk, enable the Fast Rebuild. The default is disabled.
Constraint
Here are some constraints about Fast Rebuild.
Only thick/fat RAID group supports this feature. Thin provision RAID group already has this
feature implement.
When rebuild happened in a fast rebuild virtual disk, clean partitions are not rebuilt since
there are no data saved there. Though clean partitions are never rebuilt, their health status
is good.
If all partitions of the fast rebuild virtual disk are clean, then no rebuild would happen and no
event would be sent.
The RAID stacks could not use optimize algorithm to compute parities of a partition which is
not rebuilt. Thus, the performance of random write in a clean partition would be worse.
CAUTION:
The fast rebuild should not be enabled for a virtual disk whose access pattern is
random write.