On Thursday December 1, eyal@xxxxxxxxxxxxxx wrote:
> I have (had) a 4 disk RAID5 /dev/sd[abcd]1.
>
> sda went bad (really, bad sectors) and is being replaced, hope
> to get a replacement tomorrow.
>
> While the array was degraded (but running) sdd failed (controller
> trouble) and was marked as failed. The array went down (naturally).
> I am rather sure that sdd is healthy - see examine below.
>
> Right now /dev/sd[bcd] are seen as sd[abc] until I install the
> missing disk.
>
> I wish to bring the array up (degraded). Whatever I do mdadm
> refuses to do so
> mdadm --assemble --force /dev/sd{a,b,c}1
> should it recognise the array as degraded but good and start it?
>
> Q1) What is the correct command to bring these three up as
> degraded?
mdadm --assemble --force /dev/mdX /dev/sd[abc]1
However this won't work with the superblocks you have. So
mdadm --create /dev/mdX -l5 -c256 -n4 missing /dev/sda /dev/sdb /dev/sdc
>
> Q2) When I get the fourth disk, how do I bring the array up
> ensuring that the good disks (sd[bcd]) are marked as such
> and the fresh one (sda) is reconstructed (rather than one
> of the good ones).
As above, then
mdadm /dev/mdX --add /dev/newdisk
NeilBrown
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