Date: Wed, 26 Mar 2003 10:16:10 +0100 From: Gerrit Hannaert <gerrit.hannaert@cropdesign.com> To: "Justin T. Gibbs" <gibbs@scsiguy.com> Cc: Sven Peters <sp@lucky-tv.de>, AIC7xxx@freebsd.org Subject: Re: AW: Problem with 29160 and ADIC Tape Library Message-ID: <3E816FDA.8020803@cropdesign.com> In-Reply-To: <1218140000.1048619084@aslan.btc.adaptec.com> References: <MJEPLDFELDEHIELPBICKGEBECFAA.sp@lucky-tv.de> <1218140000.1048619084@aslan.btc.adaptec.com>
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We have an OEM version of this library (IBM Ultrium 3583) which locked
up when unloading a tape too soon after it was inserted - some kernels
froze, others generated SCSI errors similar to this but continued
without tape access.
Unfortunately this was only one of many problems with this library and I
can't remember too many details. Our particular issue, as I recall, was
related to the fact that it was attached via a SAN gateway to a Qlogic
2300F, and was "solved" either by waiting longer before unloading (20s
was fine); switching to SCSI, or using an internal SAN gateway module. I
don't suppose this helps Sven a lot though ;-)
We now have the library attached to a 29160 which for us seems to work
flawlessly using 40Mhz/8-bit mode (we had problems with higher
settings). We will be upgrading our SAN gateway shortly.
- Gerrit
Justin T. Gibbs wrote:
>>Hi Justin,
>>
>>The backup package (legato) allows to change the timing settings - but these
>>for the time after the driver acknowledges the request..so this won't help.
>>The issue is the timeout of the scsi driver itself - who long it waits
>>before aborting a command. How is it set? Can these be modified?
>>I'll try the new driver today...
>>
>>
>
>The aic7xxx driver doesn't perform the timeout function in Linux. The
>mid-layer does. It gets this information either from the "peripheral
>driver" in use (e.g. disk, tape, cdrom) or via the userland application
>using the "SCSI Generic" driver (sg). You can try modifying the timeouts
>in the tape driver, but I really suspect that the problem is in the
>timeouts passed throught the sg driver to run the picker.
>
>
>
--
=={Gerrit Hannaert}==
IT Department, CropDesign N.V.
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