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Forum Discussion
Are Flex-RAID 5 Resync Times Dependant on Data?
Hi,
I'm setting up our old ReadyNAS 314s for a staff member and have been testing out RAID 5 as the best option for them. So far the results are pretty promising: At least 85MB/sec over etherne...
Right. That's definitely more like I was expecting. Of course, I'm not so concerned with the expansion times as I am with rebuild times (in the event of a drive failure and replacement), since expansions are planned and (presumably) remain redundant.
So I suppose my main question is: Would rebuilding the replacement of a failed drive that was filled to capacity see a significant time penalty over initial synchronisation? It imagine it would involve parity processing, but presumably only the new drive would need to be written to and the other drives only read from, as opposed to moving data around. Or am I over simplifying the process?
The RAID is at a lower level than the filesystem so it doesn’t matter how full it is. It only matters if you are reading/writing data (e.g. over SMB) as that’ll slow the performance of the resync.
It’s less efficient than the initial sync (have to read from all the other disks and write primarily to the replacement disk) so it will be slower than the initial sync, and can be expected to be significantly slower.
It’s less efficient than the initial sync (have to read from all the other disks and write primarily to the replacement disk) so it will be slower than the initial sync, and can be expected to be significantly slower.
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