On Tue, 21 Mar 2000, Seth Vidal wrote:
> Hi,
> I'm doing a series of bonnie tests along with a fair amount of file
> md5summing to determine speed and reliability of a raid5 configuration.
> I have 5 drives on a TekRam 390U2W adapter. 3 of the drives are the same
> seagate barracuda 9.1 gig drive. The other two are the 18 gig barracuda's.
>
> Two of the nine gigs fail - consistently - when I run bonnie tests on
> them. One will get flagged as bad in one run and die out. This one I can
> confirm is bad b/c it fails on its own outside of the raid array (it
> fails to be detected by linux at all - no partitions are found and it
> can't be started) - the other passes a badblocks -w test and appears to
> work. However it ALWAYS fails when its a part of the array and a bonnie
> test is run.
>
> Does this sound like a hardware fault? If so why is it only occurring when
> raid is used?
You can most likely trigger it too if you run non-RAID I/O on all the disks
simultaneously.
It sounds like you have a SCSI bus problem, bad cabling / termination etc.
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