Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!samsung!uunet!auspex!yuping
From: yuping@auspex.auspex.com (YuPing Cheng)
Newsgroups: comp.periphs.scsi
Subject: Re: Two HAs on single SCSI bus
Message-ID: <6989@auspex.auspex.com>
Date: 3 Apr 91 18:42:02 GMT
References: <55@opel.COM> <1991Mar27.175719.3474@seachg.uucp>
Organization: Auspex Systems, Santa Clara
Lines: 14

In article <1991Mar27.175719.3474@seachg.uucp> burke@seachg.UUCP (Michael Burke) writes:
>Yes, one can configure a SCSI channel as above. A problem may occur if the
>two hosts try to access the data at the same time (in Unix each host "owns"
>the super block). Even in this situation you can get around the problem
>by having two partitions, each host "owning" one partition.
>

SCSI provides RESERVE and RELEASE commands to allow one host to own the
disk drive temporarily when disk data are updated.

What happen when one host reserves the drive and never releases it.  This
is an application problem. :-)

Yu-Ping Cheng, Auspex Systems Inc., ycheng@auspex.com