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). > > _______________________________________________ > > CentOS mailing list > > CentOS at centos.org > > http://lists.centos.org/mailman/listinfo/centos > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >