[4162] in linux-scsi channel archive
Ultra Wide (aic-7880) only 20Mbyte/sec?
daemon@ATHENA.MIT.EDU (Michael Lausch)
Thu Jun 18 10:22:10 1998
To: linux-scsi@vger.rutgers.edu
Date: Thu, 18 Jun 1998 16:13:34 +0200
From: Michael Lausch <mla@gams.co.at>
I'm running 2.1.105 with the 5.0.18 driver.
lilo.conf says
append "aic7xxx=ultra,verbose"
boot output:
(scsi0) <Adaptec AIC-7880 Ultra SCSI host adapter> found at PCI 6/0
(scsi0) Wide Channel, SCSI ID=7, 16/255 SCBs
(scsi0) BIOS enabled, IO Port 0xd000, IRQ 9
(scsi0) IO Memory at 0xe3000000, MMAP Memory at 0xc480a000
(scsi0) Resetting channel
(scsi0) Downloading sequencer code... 413 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.18/3.2.4
<Adaptec AIC-7880 Ultra SCSI host adapter>
scsi : 1 host.
(scsi0:0:-1:-1) Scanning channel for devices.
(scsi0:-1:-1:-1) Allocating initial 30 SCB structures.
(scsi0:0:0:0) Using wide (16 bit) transfers.
(scsi0:0:0:0) Synchronous at 20.0MHz, offset 8.
Vendor: IBM Model: DCAS-34330W Rev: S65A
Type: Direct-Access ANSI SCSI revision: 02
As far as i know, drives with ultra/wide SCSI interface should do 40
MByte/sec. So why is this disk running at 20Mbyte/sec? The Controller
BIOS is set up to do 40 MByte/sec on SCSI id 0. The disk shoudl do
ultra SCSI according to IBM's web pages.
Or ist this message wrong? Just wondering
--
Michael Lausch/g.a.m.s. edv dienstleistungen gmbh
See my web page <http://www.gams.net/~mla> or query PGP key server for PGP key.
"Reality is that which, when you stop believing in it, doesn't go away".
-- Philip K. Dick
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