On Tue, 10 Apr 2012 21:14:07 -0700 (PDT) jahammonds prost <gmitch64@xxxxxxxxx> wrote: > One other question as the badblocks progresses. > > > It will then recovery both devices in parallel. > > How many additional devices can be done at the same time? I presume that I am going to have to replace the 2 failed devices before I try and grow the array by adding 3 additional drives? I so, how many additional drives can be rebuilt concurrently with a grow? Could I add 5 devices and not see too much of a performance hit? Or would it be more sensible to add them one at a time? > I think it is best to recover, and then reshape later. I cannot promise that doing them both at once will work .... it might but I have a feeling that there might be problems. Adding three additional drives at once should work well enough in terms of performance. However I would only do it if I were very very confident of the drives. If you hit bad blocks you start losing drives, and if you have 3 drives that you haven't used before, the chance of losing them all during the reshape - while still small - becomes a little too high for comfort. But if you have run heavy bad-blocks tests on them all and they appear to work, then adding 3 drives at once should be fine. NeilBrown
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