vamythguy wrote:
> I have a RAID-5 array with four SATA disks in it. Apparently, two are
> going
> bad, so I want to replace them. But, I'm not sure which physical
> drives to
> pull. Given the following:
>
> cat /proc/mdstat
> Personalities : [raid6] [raid5] [raid4]
> md0 : active raid5 sda[0] sdd[3] sdc[2] sdb[1]
> 735351936 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
>
> Any suggestions?
Odd that you have the raid4 and raid6 modules loaded, but still
unfamiliar with /proc/mdstat...
Anyways, you are showing an array with four working disks; none failed.
If you had a failed drive, it might look like [U_UU] which would mean
the second disk had failed.
../C
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I know how /proc/mdstat works, so I know the drives haven't failed *yet*.
However my system log is reporting:
Dec 31 17:04:38 tibeaux smartd[2384]: Device: /dev/sda, 3 Offline uncorrectable sectors
Dec 31 17:04:39 tibeaux smartd[2384]: Device: /dev/sdd, 48 Currently unreadable (pending) sectors
over and over again.
And another list member ( Pedro Fernandes Macedo <webmaster@xxxxxxxxxxxxxxxxxxx>) says this means the two disks are in danger of failing. So, unless I can safely prevent against that, I want to replace the disks before they do. I would just add a hot spare and let mdadm do it, but there is no room in the case. So, back to the original question...
