Thanks !
Steve
Doug Ledford wrote:
>
> Steve Davies wrote:
> >
[snip]
> >
> > [root@one47]# /sbin/hdparm -tT /dev/sda /dev/sdb
> >
> > /dev/sda:
> > Timing buffer-cache reads: 128 MB in 1.20 seconds =106.67 MB/sec
> > Timing buffered disk reads: 64 MB in 25.62 seconds = 2.50 MB/sec
> > ^^^^^^^^^^^
> > --- Ouch !!!
> > /dev/sdb:
> > Timing buffer-cache reads: 128 MB in 1.18 seconds =108.47 MB/sec
> > Timing buffered disk reads: 64 MB in 5.00 seconds =12.80 MB/sec
> >
> > These results are consistent !
>
> You mention that these two drives are hanging off of different channels
> on the controller. The results you are seeing are consistent with the
> channel that /dev/sda is on having termination or cabling problems
> (excessive mesg retries, complete command retries due to parity errors,
> that sort of stuff). I would check to make sure termination is good on
> that channel, that the cable is good, and maybe try moving things around
> to different connectors and that sort of thing just to make sure that
> the cabling isn't the problem.
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