On Fri Apr 15, 2016 at 09:26:48PM +1000, Eyal Lebedinsky wrote:
> When I request to replace sda with sdj (RAID6 in my case), does it
> create sdj from the other members (NOT using sda) or does it make a
> copy of (by reading) sda?
>
> I hope it is the former, assuming sda is having issues and the action
> is precautionary.
>
It's the latter. The data is copied from the existing disk, unless a
read-error occurs, in which case it'll be reconstructed from the other
members. This will be faster and have a far lower impact on performance
than using the other members for everything. If you cannot trust the
disk you're replacing then it should be failed and a normal rebuild
carried out instead.
> And while I am here, can I replace two members at the same time? This
> should save time as it takes about 10 hours to reconstruct a 4TB member.
>
I've no idea on this one I'm afraid. I can't think of any immediate
reason why this wouldn't be possible, but whether the current
implementation supports it or not is another matter. You could test with
loopback devices.
Cheers,
Robin
--
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( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
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