Re: scsi tuning
On Sun, 21 Apr 2002, Michel Lanners wrote:
> On 21 Apr, this message from John Schmidt echoed through cyberspace:
> > On Sunday 21 April 2002 08:36 am, John Schmidt wrote:
> >> I have a Power Tower Pro with a G3/466 card running with scsi drives. I am
> >> running woody with kernel 2.2.20. The drive is hooked up to the internal
> >> scsci bus which supposedly can do 10MB/sec transfers (I think I got the
> >> right specs; I do know that the external bus is half the speed of the
> >> internal). The drive in question is:
> >>
> >> mesh: target 1 synchronous at 10.0 MB/s
> >> Vendor: QUANTUM Model: FIREBALL_TM3200S Rev: 300X
> >> Type: Direct-Access ANSI SCSI revision: 02
>
> This disk is very low-speed (and low-quality on top of that). There's no
> reason to put that on a faster bus.
Indeed. Mine gets 3.3 MiB/s on the MESH, and 3.5 on the Sym53c875. It's a shame
Quantum called that a U-SCSI disk.
> > Oops, I goofed and copied the wrong drive:
> >
> > Vendor: QUANTUM Model: FIREBALL SE8.4S Rev: PJ0A
> > Type: Direct-Access ANSI SCSI revision: 02
> > Detected scsi disk sdc at scsi0, channel 0, id 2, lun 0
> > mesh: target 3 synchronous at 10.0 MB/s
>
> I don't know that disk, but I did get those hdparm numbers you reported
> for all (reasinably fast) SCSI disks on the internel (aka MESH) SCSI on
> oldworlds. If that Fireball SE is a lot faster than the TM (which I
> doubt..), than you could add a more recent SCSI card (some SYM or
> Adaptec...), but that won't be a cheap solution.
A Sym53c875 is not that expensive. Should be doable for less than 75 EUR.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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