[4907] in linux-scsi channel archive
Re: dual-attached disk
daemon@ATHENA.MIT.EDU (Robert Dobozy)
Thu Oct 15 18:46:17 1998
Date: Thu, 15 Oct 1998 12:20:20 +0200 (MET DST)
From: Robert Dobozy <robo@idata.sk>
To: Andy Poling <andy@globalauctions.com>
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.3.96.981015000704.19200U-100000@roadrunner.realbig.c
om>
On Thu, 15 Oct 1998, Andy Poling wrote:
> > Yes it can be. If you want to share disk, but not in parallel. One machine
> > can reserve this disk and use it. Other machine will get reservation
> > conflict when accessing this device. When first machine is finished, it
> > must unreserve device.
>
> That could be a problem when the machine with the reservation is
> down/crashed...
No, you have to have some process which will detect other machine
down/crash and than make BUS DEVICE RESET, which will release all
reservations. What on of reasons, why scsi reset from time to time may
appear. You have to ensure, that this process (call him bus arbiter - I'm
not sure if it's correct in english) will run only one machine ....
Robert
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