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Date:      Thu, 10 Jul 1997 10:08:04 -0600
From:      "Justin T. Gibbs" <gibbs@plutotech.com>
To:        Wayne.Farmer@mailhost.dpie.gov.au
Cc:        freebsd-scsi@FreeBSD.ORG (Reply Requested)
Subject:   Re: Adaptec 2940UW hang with multiple Wide SCSI Disks - FreeBSD 2.2.2 
Message-ID:  <199707101608.KAA17853@pluto.plutotech.com>
In-Reply-To: Your message of "Thu, 10 Jul 1997 10:11:26 +1000." <"970710001128Z.WT27093. 0*/PN=Wayne.Farmer/OU=CORPHQ/O=DPIE/PRMD=AUSGOVDPIE/ADMD=TELEMEMO/C=AU/"@MHS> 

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>I think I read recently that doing a "newfs" on a wide SCSI disk with an 
>Adaptec 2940UW hangs the system (a deadlock ?)

The problem has nothing to do with the Adaptec driver or controller.  This
was a buffer deadlock bug that could be triggered by using the block 
instead of raw device when performing a newfs (newfs sd0a instead of newfs 
rsd0a).  By disabling wide negotiation to the device, you are changing the
timing characteristics slightly and perhaps avoiding this deadlock.  My
guess is that if you perform a newfs on the raw partition it will work
just fine even if wide negotiation is turned on.

--
Justin T. Gibbs
===========================================
  FreeBSD: Turning PCs into workstations
===========================================





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