On 2013-01-10 08:51, Jason wrote:

One of my server's zfs faulted and it shows following:
         backup      UNAVAIL      0     0     0  insufficient replicas
           raidz2-0  UNAVAIL      0     0     0  insufficient replicas
             c4t0d0  ONLINE       0     0     0
             c4t0d1  ONLINE       0     0     0
             c4t0d0  FAULTED      0     0     0  corrupted data
             c4t0d3  FAULTED      0     0     0  too many errors
             c4t0d4  FAULTED      0     0     0  too many errors
...(omit the rest).

My question is why c4t0d0 appeared twice, and c4t0d2 is missing.

Have check the controller card and hard disk, they are all working fine.

This renaming does seem like an error in detecting (and further naming)
of the disks - i.e. if a connector got loose, and one of the disks is
not seen by the system, the numbering can shift in such manner. It is
indeed strange however that only "d2" got shifted or missing and not
all those numbers after it.

So, you did verify that the controller sees all the disks in "format"
command (and perhaps after a cold reboot - in BIOS)? Just in case, try
to unplug and replug all cables (power, data) in case their pins got
oxydized over time.


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