Re: Slow disk - hdparm, S.M.A.R.T, badblocks, what else?
Sorry if this is beating a dead horse since you've already checked ...
I believe there are (at least) three different "speed" 80-conductor ide
cables -- ATA66, ATA100, and ATA133. They are not always labeled, so it
can be hard to tell. My "slow" cable was a left over from an old
machine and it was not labeled at all.
--- "Karsten M. Self" <kmself@ix.netcom.com> wrote:
> on Thu, Jul 08, 2004 at 07:28:19AM -0700, Richard Weil
> (rcweil@yahoo.com) wrote:
>
> > --- "Karsten M. Self" <kmself@ix.netcom.com> wrote:
> > > I'm trying to find out why my disk performance is so slow -- 150x
> > > worse than a comperable system -- and what I can do to improve
> it.
> > >
> > > I've got a system with a painfully slow disk. The worse as it's
> > > serving as a Samba server for a small domain (ten workstations).
> > > Saturated 802.1g WiFi is disk-starved presently. System response
> > > under any I/O load is glacial. 'top' routinely reports load
> > > averages of from 2 to 10+ with 99% idle CPU. Memory utilization
> is
> > > generally nominal, and was *not* an issue in the tests below,
> though
> > > disk performance pretty much precisely sucked.
>
> <...>
>
> > If this isn't a problem that suddenly manifested itself,
>
> I don't believe it is, though I didn't take measurements right at the
> start. It's certainly been slow for a couple of months, though just
> how
> bad wasn't readily apparent until I really looked at it. The system
> itself is hardly older than that.
>
> > it might be the ide cable to the drive.
>
> If you're talking about the 40 vs. 80 conductor drive cables, it's
> the
> latter. That's among the first things I checked last night.
>
> > I had a drive running slowly (a Maxtor, too) and just got a big
> > improvement in it's performance by using a new cable. I got a round
> > ATA133 cable for $4.00 and the drive's performance radically
> improved.
>
> This is flat 80-conductor cable.
>
> > I knew it was the cable, though, because the drive had been running
> > fast in a nearly identical system with the only real difference
> being
> > the cable. Also, though you probably know more about than I do, the
> -I
> > flag of hdparm is pretty useful for info.
>
> Trying to interpret all of that, but yeah.
>
> > Richard
>
> Thanks.
>
>
> > > The results may be seen at:
> > >
> > > http://linuxmafia.com/~karsten/slow-drive/
> > >
> > > Comparative results for a fast system similarly configured (but
> > > different HW) is at
> > >
> > > http://linuxmafia.com/~karsten/slow-drive/fast-drive.tar.gz
>
>
> Peace.
>
> --
> Karsten M. Self <kmself@ix.netcom.com>
> http://kmself.home.netcom.com/
> What Part of "Gestalt" don't you understand?
> Curses, like chickens, come home to roost.
>
> ATTACHMENT part 2 application/pgp-signature name=signature.asc
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