[CentOS] Storage/SCSI Error on our CentOS server

[Hairul Ikmal Mohamad Fuzi]

John, Vasiliy,

Thanks for the input.
We managed to figure out the problem after swapping all the items.
It seems the SCSI host adapter is giving us the problem.
Cheers.

-Ikmal

On 2/25/07, Vasiliy Boulytchev <vasiliy at linuxspecial.com> wrote:
> Agreed, I was thinking of cables as well.
>
> See if you get better performance when you replace the cables :)
>
> Good luck
>
> John R Pierce wrote:
> >
> > 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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