Date: Wed, 24 Nov 1999 19:48:35 +0100 From: Markus Stumpf <maex-lists-freebsd-scsi@Space.Net> To: scsi@FreeBSD.ORG Subject: [Q] SCSI speed and CD-ROM Message-ID: <19991124194835.F95710@Space.Net>
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I have a machine (2.2.7) with the following hardware:
Controller
ahc0 <Adaptec aic7880 Ultra SCSI host adapter> rev 1 int a irq 10 on pci0:6:0
ahc0: aic7880 Wide Channel, SCSI Id=7, 16 SCBs
Disks
(ahc0:0:0): "IBM DDRS-34560W S97B" type 0 fixed SCSI 2
sd0(ahc0:0:0): Direct-Access 4357MB (8925000 512 byte sectors)
(ahc0:1:0): "IBM DDRS-34560W S97B" type 0 fixed SCSI 2
sd1(ahc0:1:0): Direct-Access 4357MB (8925000 512 byte sectors)
CD-ROM
(ahc0:4:0): "TOSHIBA CD-ROM XM-6201TA 1030" type 5 removable SCSI 2
On bootup I see a message
ahc0:A:4: refuses WIDE negotiation. Using 8bit transfers
A friend of mine said that the CD-ROM slows down the SCSI bus (and thus
the disk I/O).
Is this true
a) generally
b) only if the CD-ROM is active/mounted/used for I/O.
If a) I would remove the CD-ROM, as I only use it 1 or 2 times a year
anyway and if b) I'd keep it :-)))
Thanks
\Maex
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