Re: help wanted - 6-disk raid5 borked: _ _ U U U U

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On Sunday April 16, molle.bestefich@xxxxxxxxx wrote:
> A system with 6 disks, it was UUUUUU a moment ago, after read errors
> on a file now looks like:
> 
> /proc/mdstat:
>   md1 : active raid5 sdf1[5] sde1[4] sdd1[3] sdc1[2] sdb1[6](F) sda1[7](F)
>       level 5, 64k chunk, algorithm 2 [6/4] [__UUUU]
> 
> uname:
>   linux 2.6.11-gentoo-r4
> 
> What's the recommended approach?
> 
> Compile 2.6.16.5 and mdadm 2.4.1, install both, reboot, then use mdadm
> assemble --force (after automatic mount probably fails)?

You shouldn't need to upgrade kernel or mdadm (though you didn't
report the version of mdadm, so I cannot be sure, and upgrading won't
hurt). 

But yet, use --assemble --force and be aware that there could be data
corruption (without knowing the history it is hard to say how
likely).  An 'fsck' at least would be recommended.

NeilBrown
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