Messages in this thread | | | Date | Mon, 28 Dec 1998 12:25:49 +0000 | From | Steve Davies <> | Subject | Re: More outstanding 2.1.1xx bug/features ? |
| |
I had checked this repeatedly... Honest... Today I followed Doug's advice and tried again... I now get much more similar results on the two channels (after just waggling some cables) - Perhaps I'll now swap the Channel-A cable entirely to see if it helps.
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.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |