If your Snapshot RAID is unsynchronized because you’ve only added new files, then recovery will be based of the following two scenarios:
- If the failed drive did not contain new data, you are fine. The failed drive will be fully recovered. Note that renamed and moved files are a non-issue during recovering, and FlexRAID will recover despite them and without issues.
- If the failed drive did contain new data that is unsynchronized, you will lose that new unsynchronized data but all other data will be fully recovered.
However, if you edited or deleted data then you run a higher risk of losing some data on the failed drive, but only up to the unsynchronized portion. The remainder of the data will be recoverable. So, if you edited or deleted only 1GB of data, only 1GB would not be recoverable. Note that when running multiple parity levels, 100% recovery is possible even if the RAID is unsynchronized.
When using Snapshot RAID, you should always ensure to re-synchronize the RAID after data changes have occurred.
If you re-synchronize the RAID often, the probability of a drive failing while the RAID is unsynchronized will be extremely low.
Again, this is only a limitation of the Snapshot RAID feature of FlexRAID as the Real-Time RAID feature has no such limitation.
- September 2, 2011 @ 17:44:24 [Current Revision] by Brahim
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