I had messages in /var/log/messages
that seem to indicate that /dev/sdc is problematic (all besides the last two):
$ sudo grep sdc /var/log/messages
Apr 11 14:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Currently unreadable (pending) sectors
Apr 11 14:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Offline uncorrectable sectors
Apr 11 14:35:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Currently unreadable (pending) sectors
Apr 11 14:35:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Offline uncorrectable sectors
Apr 11 15:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Currently unreadable (pending) sectors
Apr 11 15:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Offline uncorrectable sectors
Apr 11 15:35:58 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Currently unreadable (pending) sectors
Apr 11 15:35:58 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Offline uncorrectable sectors
Apr 11 16:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Currently unreadable (pending) sectors
Apr 11 16:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Offline uncorrectable sectors
Apr 11 16:35:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Currently unreadable (pending) sectors
Apr 11 16:35:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Offline uncorrectable sectors
Apr 11 17:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Currently unreadable (pending) sectors
Apr 11 17:05:57 docker smartd[1070]: Device: /dev/sdc [SAT], 56 Offline uncorrectable sectors
Apr 11 17:35:57 docker smartd[1070]: Device: /dev/sdc [SAT], No more Currently unreadable (pending) sectors, warning condition reset after 1 email
Apr 11 17:35:57 docker smartd[1070]: Device: /dev/sdc [SAT], No more Offline uncorrectable sectors, warning condition reset after 1 email
However, these last two lines above, and:
$ cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 sdc2[2] sdd2[3] sdh2[7] sda2[0] sdg2[6] sdf2[5] sdb2[1] sde2[4]
11712147456 blocks super 1.2 512K chunks 2 far-copies [8/8] [UUUUUUUU]
bitmap: 8/88 pages [32KB], 65536KB chunk
unused devices: <none>
seem to indicate that /dev/sdc is not problematic anymore.
Is that correct?