Date: Wed, 23 Dec 1998 22:25:33 +1000 From: "Harry Starr" <starr3@gccs.com.au> To: <geoffb@demon.net>, "current" <freebsd-current@FreeBSD.ORG> Subject: Re: Problems with CAM and ncr Message-ID: <002f01be2e6f$56a16d60$0a9811cb@gccs.com.au>
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Actually, I did put a "disable tags" quirk into cam_xpt.c, and it seems to
be stable now.
Is/Has anyone had success using the CAM stuff against IBM Ultrastar drives
(9GB, 18GB) ??
I plan on switching to those when I retire these "old", problematic CONNERs.
Harry.
----- Original Message -----
From: Geoff Buckingham <geoffb@gti.noc.demon.net>
To: Harry Starr <starr3@gccs.com.au>; current <freebsd-current@FreeBSD.ORG>
Sent: Wednesday, December 23, 1998 9:21 PM
Subject: Re: Problems with CAM and ncr
>On Tue, Dec 22, 1998 at 10:45:38PM +1000, Harry Starr wrote:
>> There seems to be a major problem with the new CAM code and the ncr
driver.
>>
>> Config:
>>
>> Asus SC200 (ncr810) in Asus P2L97 M/B with PII-300 and 128MB mem.
>>
>> With "hard" disk access (Make world; or Make release), more than likely,
the
>> ncr driver will give an error message of ncr:::queue empty, at which
point
>> the system will lock up (pager errors, etc). This is almost 100%
>> reproducible.
>>
>> The SCSI drives are "old" Conner Cp3470. I'm not sure if there were
problems
>> with tagged queueing in this model; but they worked OK in a DG/UX system.
>>
>Someone more knowledgable than me will doubtless be along in a bit, but
>I have had the NCR driver working with CAM for build world etc without
>problems however that machine has a 'modern' drive.
>
>You may be able to eliminate TAG problems by adding a quirk to
>/usr/src/sys/cam/cam_xpt.c specifying a lower maxtags, then compiling
>a new kernel. I have one for a hardware RAID which was causing hangs:
>
> {
> /* Delf Stuff */
> {
> T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED,
> /*vendor*/"C_Design", /*product*/"DELFRaid",
/*revision*/"0131
>"
> },
> /*quirks*/0, /*mintags*/24, /*maxtags*/28
> },
>
>This seems to have fixed it (one week uptime, was crashing within 30 mins
of
>disk load)
>
>If someone from the CAM group happens along: Is there a methed for
submision
>and review of such quirks? I have raised a non critical kernel PR for the
>above, although I must revise it as I have altered min/maxtags since
>submiting it.
>
>There is no scientific method for the values chosen above, they just
>seem to prevent the hangs and excesivly uneven distribution of TAGs
>between logical devices within the RAID.
>
>> The ncr driver previously reports that "tagged openings is now 31".
>>
>> Reverting to a kernel dated "8-Aug-1998" alleviates the problem.
>>
>> Any thoughts ??
>>
>--
>GeoffB
>
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