Date: Fri, 26 Feb 1999 02:46:51 -0500 From: Doug Ledford <dledford@redhat.com> To: "christian.klein" <klein002@bama.ua.edu> Cc: AIC7xxx@FreeBSD.ORG Subject: Re: Adaptec 7890 and RAID portIII RAID controller Linux Support Message-ID: <36D6516B.D9E2CA82@redhat.com> References: <Pine.SOL.4.02A.9902251854220.20131-100000@bama.ua.edu>
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"christian.klein" wrote:
>
> scsi0 is a 2940UW, scsi1 and 2 are the channels on a buslogic bt-932
> (narrow dual channel)
>
> Attached devices:
> Host: scsi0 Channel: 00 Id: 00 Lun: 00
> Vendor: SEAGATE Model: ST32550N Rev: 0021
> Type: Direct-Access ANSI SCSI revision: 02
> Host: scsi0 Channel: 00 Id: 01 Lun: 00
> Vendor: SEAGATE Model: ST34501N Rev: 0015
> Type: Direct-Access ANSI SCSI revision: 02
> Host: scsi0 Channel: 00 Id: 06 Lun: 00
> Vendor: PLEXTOR Model: CD-ROM PX-32CS Rev: 1.00
> Type: CD-ROM ANSI SCSI revision: 02
> Host: scsi1 Channel: 00 Id: 00 Lun: 00
> Vendor: SEAGATE Model: ST34572N Rev: 0784
> Type: Direct-Access ANSI SCSI revision: 02
> Host: scsi2 Channel: 00 Id: 00 Lun: 00
> Vendor: SEAGATE Model: ST34572N Rev: 0784
> Type: Direct-Access ANSI SCSI revision: 02
>
> the last two are striped, one on each channel of the buslogic controller,
> mounted as /usr. there is not much io intensive stuff done on the machine
> except for bonnie runs ;-). i do rip a _lot_ of audio to wavs from the
> 32x ultraplex attached to the 2940 to /usr/local/var/spool/wav on the
> striped array. i doubt that is enough io to make the bug rear it's ugly
> head. is there anything i can do to try to force this error to
> occur? i'm running 2.2.1-ac6. i do have a 3940UW, would you recommend
> that i buy 68pin to 50 ping adapters and use that instead of the buslogic
> card?
>
> btw,
> the 32550N is an nt installation, the ST34501N (narrow cheetah) is my
> root partition, and the 2 4-gig cudas are striped as /usr
>
> the only slightly nonstandard thing i do is
> make sure and edit /usr/src/linux/drivers/scsi/hosts.c and reorder
> the array so devices get detected in the order i want them.
If they are working for you, then I wouldn't mess with it. However,
remember what I've said and if you do get any strange errors in the
future, then think about doing just what you mentioned :) I will also
note that it appears to be a CPU race condition, so the faster the CPU
or the slower the drives, the less like it is to happen. In our case,
it was on an aging Pentium 133 machine that had 4xUW and 2xU2W drives,
so the drive speed to CPU speed ratio was quite high.
--
Doug Ledford <dledford@redhat.com>
Opinions expressed are my own, but
they should be everybody's.
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