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Forum Discussion
raid scrubbing and redundancy
When a device is going through a scheduled raid scrubbing session, is the volume considered redundant?
Since the display shows 'resync' during scrubbing, is there a difference between resyncing and scrubbing? if so, what exactly are the differences?
if not, are we putting are data at greater risk when scrubbing?
What happens if a drive fails during scrubbing?
How is scrubbing affected by dual redundancy, are the 2 parity stripes scrubbed in parallel (simultaniously) or sequentially?
As above, what happens with dual redunancy + scrubbing + drive failure?
inquiring minds want to know
Since the display shows 'resync' during scrubbing, is there a difference between resyncing and scrubbing? if so, what exactly are the differences?
if not, are we putting are data at greater risk when scrubbing?
What happens if a drive fails during scrubbing?
How is scrubbing affected by dual redundancy, are the 2 parity stripes scrubbed in parallel (simultaniously) or sequentially?
As above, what happens with dual redunancy + scrubbing + drive failure?
inquiring minds want to know
4 Replies
Replies have been turned off for this discussion
- It would be interesting to know the answer to these questions.
I agree. I'm particularly interested in knowing if scrubbing makes the singly redundant volume vulnerable while it is running.bollar wrote: It would be interesting to know the answer to these questions. - An authoritative answer would be nice, but I think we can guess some of the answers.
- An array being scrubbed is redundant, but perhaps it's considered dirty. I have had a drive fail in this situation and I received the following error messages:Disk failure detected.
If the failed disk is used in a RAID level 1, 5, or X-RAID volume, please note that volume is now unprotected, and an additional disk failure may render that volume dead. If this disk is a part of a RAID 6 volume, your volume is still protected if this is your first failure. A 2nd disk failure will make your volume unprotected. If this disk is a part of a RAID 10 volume,your volume is still protected if more than half of the disks alive. But another failure of disks been marked may render that volume dead. It is recommended that you replace the failed disk as soon as possible to maintain optimal protection of your volume.
[Thu Sep 29 04:49:09 CDT 2011]
RAID sync finished on volume C. The array is still in degraded mode, however. This can be caused by a disk sync failure or failed disks in a multi-parity disk array.
[Thu Sep 29 04:49:15 CDT 2011]
My guess is that scrubbing simply flags the array as dirty, but redundant and triggers the rsync.
You are saying that you had a disk fail during scrubbing?...I have had a drive fail in this situation...
If so, it is good to know that no data was lost.
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