[554] in linux-scsi channel archive
Re: Errors & Unit Attention
daemon@ATHENA.MIT.EDU (Fons Botman)
Mon Aug 28 18:17:48 1995
To: linux-scsi@vger.rutgers.edu
Date: Mon, 28 Aug 95 11:05:49 MET
From: Fons Botman <ND3995!botman@relay.nl.net>
In-Reply-To: <199508270314.XAA00527@kf8nh.wariat.org>; from "Brandon S. Allbery KF8NH" at Aug 26, 95 11:14 pm
Reply-To: botman@rabo.nl
Are there any boards which have proven to handle hot plug correctly?
Brandon S. Allbery wrote:
> In your message of Sat, 26 Aug 1995 15:32:13 EDT, you write:
> +-----
> | This is one of those areas that separates a good OS from a great one:
> |
> | SCSI can electrically and protocol wise handle hot connection and disconnecti
> on
> | of drives, but many OS's (if not most) don't retry operations sufficiently
> | to handle it.
> +-----
>
> Try it with a PC SCSI device sometime. AHA1542s in particular will freeze
> solid - the on-board microcode crashes and you have to reset/powerdown to
> get it back. (I have had it happen.) Most other PC SCSI cards of my
> acquaintance also fail rather poorly in such a situation. (And for the
> multi-architecture folks: you can destroy an SBus SCSI card by trying to
> hot-plug devices...)
>
> It hardly seems worth catering to a facility not supported by much if any
> hardware.
>
> ++Brandon
> --
> Brandon S. Allbery Linux & Solaris 2 hack; ham; soccer nut; pipe smoker
> bsa@kf8nh.wariat.org APK Net Ltd. *is* The Internet in Northern Ohio
> bsa@telotech.com Telotech, Inc., custom Unix database solutions
