[550] in linux-scsi channel archive
Errors & Unit Attention
daemon@ATHENA.MIT.EDU (Brandon S. Allbery KF8NH)
Sun Aug 27 03:43:34 1995
To: sdw@lig.net (Stephen D. Williams)
cc: eric@aib.com, lnz@dandelion.com, linux-scsi@vger.rutgers.edu
Date: Sat, 26 Aug 1995 23:14:05 -0400
From: "Brandon S. Allbery KF8NH" <bsa@kf8nh.wariat.org>
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
