Device in software RAID 10 array: clean, degraded. Ouch?
Even though this is a software RAID question I thought I'd post it in hardware as it sort of leans more that way IMO.
I've got 4x 500GB drives in software RAID.
/dev/md0 is RAID 1 and mounted to /boot
/dev/md1 is RAID 10 and is swap
/dev/md2 is RAID 10 and is the main system and data device
I looked at mdadm this evening and noticed on md2
Here's the full outputs from mdadm for each device and also the output from /proc/mdstat
So it looks like /dev/sdb1 and /dev/sdb2 are functioning in /dev/md0 and /dev/md1 respectively.
But /dev/sdb3 has dropped out (or removed, apparently) from /dev/md2
Is this a major problem? i.e. a data loss problem?
With RAID 10 my data is ok unless I lose the same drive on the opposite stripe, or so I believe.
Or is it something weird with just one device that can be re-added?
Anyone seen anything like this before?
I'm going to grep logs and check when this might have happened but unfortunately I've not been able to check this machine for a while so it might have been like this for a long time.
Ok so I did some log grepping and noticed this pair of log lines...
But then on Jan 7th an idiot user rebooted the server, thinking it would solve a mail relay problem. Here's the the boot from /var/log/messages...
Anyone know what might have happened to /dev/sdb3?
From the smartd warnings it looks like it's failed a SMART data check.
Why do /dev/sdb1 and /dev/sdb2 appear to be functioning ok and just /dev/sdb3 failed?
Just a particular sector that happens to be in sdb3?
Is it possible to re-add this drive to the array?
Or should I bin it and replace with a fresh drive?
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