Re: RAID-6 problem

On Sun, Oct 14, 2012 at 06:31:02AM +1100, NeilBrown wrote:

On Sat, 13 Oct 2012 11:45:10 -0700 Keith Keller
[off-list ref] wrote:

quoted

On 2012-10-13, Mikael Abrahamsson [off-list ref] wrote:

quoted

Re-creating a raid5/6 with --assume-clean is for me a disaster recovery, 
something that should be performed when everything else fails. It's 
extremely unfortunate that a lot of guides bring this in very early in the 
fault finding process.

Actually the RAID wiki suggests exactly this path, and suggests against
--force, contrary to the advice I've gotten here from Neil and others.

https://raid.wiki.kernel.org/index.php/RAID_Recovery#Restore_array_by_recreating_.28after_multiple_device_failure.29

I could update this, but not being expert all it'd say is "use
--assemble --force; if it fails ask on the mailing list."  :)  Perhaps
that's actually the best advice to give, but if there's something more
useful to put on that page maybe someone with more expertise could
update it?

--keith

You should definitely try '--assemble --force' before trying to recreate the
array.  There is no question about that.

Thanks to everybody,

The "-A --force" worked fine, the array had, in the
end, 0 mismatch count.

Thanks again,

bye,

pg

NeilBrown

-- 

piergiorgio