On 13/10/17 01:58, James J Dempsey wrote:
I have a simple problem with a 2-disk raid-1 configuration that I can’t find the solution for on the internet so I hope someone can help.
One disk failed on my 2-disk raid-1 and I foolishly (physically) removed the disk before software removing it from the array.
The current state is that the array is running degraded with 1 disk. My goal is to add a new disk and return it to a non-degraded 2-disk array.
I still have the failed disk, but I don’t really want to physically re-install it because the last time I tested that, the array started and showed the pre-failed data, not the current data. My theory of this is that the computer switched it’s idea of which disk was /dev/sda and which was /dev/sdb as a result of the original removal. So I’d like to just continue from this state without the confusion of adding that old disk physically back.
Can I just use mdadm -a to add the new disk into this existing array? How do I get rid of the missing ‘ghost’ drive?
Thanks for any help you can provide. I’ll include the output of mdstat and mdadm -D and mdadm.conf below.
—Jim—
$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0]
1953366016 blocks super 1.2 [2/1] [U_]
bitmap: 8/15 pages [32KB], 65536KB chunk
unused devices: <none>
$
Perfect...
mdadm --manage /dev/md0 --add /dev/sdb1
Wait for it to finish sync and you are all done (if only every broken
raid issue was this easy ;)
Oh, make sure you have read and understood and fixed the timeout issue
if using desktop drives.
Regards,
Adam
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