Unreadable sectors reported by smartd, is it serious?

Posted by stribika on Super User See other posts from Super User or by stribika
Published on 2010-06-13T21:33:20Z Indexed on 2010/06/13 21:43 UTC
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raid-5

I have a RAID 5 array of 4 disks. In the last 2 days I began to see these messages in the log:

Jun 13 23:01:05 localhost smartd[4537]: Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors
Jun 13 23:01:05 localhost smartd[4537]: Device: /dev/sdb [SAT], 2 Currently unreadable (pending) sectors

If I have 2 faulty disks then the array should not show all disks OK:

md0 : active raid1 sdd1[3] sdb1[1] sdc1[2] sda1[0]
      64128 blocks [4/4] [UUUU]

Strangely there are no other problems just the log messages. I am worried because sda is new and I previously had problems with sdb. (Completely died but the guy who sold it to me fixed it somehow.) Am I in danger of losing data? What should I do now?

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