[3054] in linux-scsi channel archive
Re: Dual-hosting SCSI and failure modes (was Re: RAID & unhappy
daemon@ATHENA.MIT.EDU (sage)
Wed Jan 7 20:04:56 1998
Date: Wed, 07 Jan 1998 16:39:13 -0800
From: sage <sage@newdream.net>
To: Doug Ledford <dledford@dialnet.net>
CC: linux-scsi@vger.rutgers.edu, linux-raid@vger.rutgers.edu
> The Adaptec aic7xxx driver doesn't have any problem with this. We will
> currently share a bus with another controller, including things such as
> keeping track of when bus resets occur, regardless of who does them, and
> performing the appropriate action. Actually, the spec is fairly well
> defined on how to operate here and it isn't to hard to implement, but the
> card has to be able to signal the kernel that someone other than the card
> tripped the reset pin.
Does this mean you can have two different hosts on the same SCSI bus
controlling the same device, or does the raid hardware have to have
special support for multiple controllers (and disable caching read/write
caching in the OS)? Alternatively, is it possible to have two
controllers (on two different servers) on the same bus and leave one
inactive, only using it when the primary host goes down?
thanks-
sage
