[linux-lvm] cmp of inactive mirrored LV fails

starlight at binnacle.cx starlight at binnacle.cx
Fri Dec 2 17:20:11 UTC 2011


Had a drive report via 'smartd' and 'smartctl'
that it was having trouble reading a sector.
For about two days "197 Current_Pending_Sector"
indicated one.  Then the drive appears to
have recovered itself and the count went
to zero.  Strangely a 'dd iflag=direct'
of the drive to /dev/null was successful
during the period where the unreadable sector
count was  non-zero.  'smartctl -l error'
reports no errors.

Concerned, I ran a 'cmp' of the two mirror
image LVs (_mimage_0 vs _mimage_1) for each
of the LVs on the drive.  Two compare
differently; in particular one that is
presently not "open" according to the 'lvs'
command failed to compare.

Does anyone know how to deal with this?
A concern is that the _mimage_0 LV is
on the drive experiencing the problem.

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