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Re: Determining Which Physical Drive Matches Which Logical Device

On 1/1/07, Curtis Doty <Curtis greenkey net> wrote:
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.


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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 margo bijoux nom br>) 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...
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