Hairul Ikmal Mohamad Fuzi wrote:
Hi,
Currently we are running CentOS 4.x on a 2-way Opteron machine.
This machine, through a SCSI host adapter (Adaptec), is connected to a
2TB storage unit (an external RAID-5 disk array)
Until our recent unintentional power trip, everything was fine and
smooth.
We have been experiencing complication accessing the storage ( it
could be either intermittent filesystem error, partition could not be
mounted in read-write mode, unacceptable writing speed, etc ),
especially when we start to 'write' on the storage.
After a few check, we are suspecting either :
1) the storage unit (but the storage control panel did not report any
disk/raidset failure) is failing or,
2) the SCSI host adapter is failing, or
3) the filesystem itself is corrupted (we did 'fsck.ext3 -v -f' but it
turned out it did not find any errors)
or 4) scsi cabling. I see some scsi transmission errors in there.
About the only way I know to diagnose something like this would be to
swap parts... I'd swap the controller card and see if the problems go
away, then try the cable, then try the storage controller. if one of
these things fixes the problem back the other changes out (ie put the
original card back, etc).
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