Re: RAID6 seemingly shrunk itself after hard power outage and rebuild with replacement disk

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On Sat, Mar 05, 2011 at 11:57:58AM -0500, Phil Turmel wrote:
> I have a suspicion that 'mdadm --create --assume-clean' or some
> variant was one of those.  And that the rescue environment has a
> version of mdadm >= 3.1.2.  The default metadata alignment changed in
> that version.
Confirmed.

> The lowest device node is the last device role?  Any chance these are also out of order?
Yes, the data was confirmed to be shuffled later.

> If my suspicions are right, you'll have to use an old version of mdadm
> to redo an 'mdadm --create --assume-clean'.
Passed -e 0 with that, and corrected the order of the devices, and then
it looked much better. Some minor data corruption where the new metadata
overwrote stuff, but much easier to recover those files than the entire
35 TiB.

Thanks everybody for the help.

-- 
Robin Hugh Johnson
Gentoo Linux: Developer, Trustee & Infrastructure Lead
E-Mail     : robbat2@xxxxxxxxxx
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