*BSD News Article 89495


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From: torbjorn.carlsson@unilog.se (Torbjörn Carlsson)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Weird CCD behaviour...
Date: Fri, 14 Feb 1997 10:33:28 GMT
Organization: Unilog Systems AB
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On 13 Feb 1997 10:52:22 GMT, roberto@eurocontrol.fr (Ollivier Robert)
wrote:

>    [courtesy cc of this posting sent to cited author via email]
>
>In article <33018D70.773C2448@doc.ic.ac.uk>,
>Paul Dias  <pbd@doc.ic.ac.uk> wrote:
>> Can anyone tell me what the largest filesystem size supported by FreeBSD
>> is, please?
>
>A few TB I think. We got rid of the 2 GB limitation a while ago.
>-- 

Hmm...
Looks like I've run into some remains of that limitation.

We are trying to build a News spool using the ccd driver that comes
with 2.1.6

Hardware: Adaptec 3940UWD SCSI adapter, and Micropolis 3391 WS
Diskdrives. (9.1 GB)

When using the standard /dev/sd2 devices there is no problems with
making 1 partition out of the whole disk and then running newfs on
that partition.

But when we're trying to use the ccd and map the single large
partition the machine crashes with an error-message like this:

Feb  7 15:28:19 news1 /kernel: ahc1: ahc_scsi_cmd: more than 256 DMA
segs
Feb  7 15:28:19 news1 /kernel: sd2: oops not queued 
Feb  7 15:28:19 news1 /kernel: biodone: buffer already done

And from there the only response we get from the machine is when the
reset button is pressed.

The only way we've been able to use the disks in a ccd-configuration
is to partition them down to 2GB partitions and then use ccd to
concatenate the partitions.
Partitions slightly larger than 2GB crashes the machine in the same
way as the single large one.

The adaptec driver itself seems to be working, but the combination of
adaptec and ccd does not really work.

Question:
Has anyone else seen this behaviour ?
What about other brands of SCSI-adapters ? 


/Torbjörn

--
Torbjörn Carlsson  Phone: +46 18 13 20 10 Mobile: +46 705 27 01 11  
Unilog Systems AB  Fax:   +46 18 13 20 11 Email:  tc@unilog.se
Kungsängsvägen 29  WWW:   http://www.unilog.se/tc.html
S-753 23 Uppsala, Sweden