[565] in linux-scsi channel archive
Re: Errors & Unit Attention
daemon@ATHENA.MIT.EDU (Stephen D. Williams)
Wed Aug 30 18:49:35 1995
From: sdw@lig.net (Stephen D. Williams)
To: drm89121@pegasus.cc.ucf.edu
Date: Wed, 30 Aug 1995 10:29:18 -0400 (EDT)
Cc: sdw@lig.net, bsa@kf8nh.wariat.org, eric@aib.com, lnz@dandelion.com,
linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.3.91.950829035221.9161A-100000@chaos.sub.ucf.edu> from "Harik A'ttar" at Aug 29, 95 04:02:20 am
...
> > (Note: most of my SCSI hacking/assembling days was in 8-bit/16-bit era...)
>
> Ahh yes. of course, my machine originated in the 8 bit/16 bit days.
> It's been slowly upgraded since. What FD scsi card are you using?
> Ive had no problems either, mine is the TMC-1680 (ISA bus) And it works
> like a charm. Now if I only had a DAT to test it with. :(
TMC-1680 also in my dev machine, with 2 large SCSI drives and a Tandberg
2.5GB (3M Magnus 2.[0-5] tapes)
...
> > I disagree: one of the things that I'm slowly working on is RAID and
> > RAID like support built into the kernel and/or device drivers: having
> > a kernel that will support hot-swap gracefully and robustly as
> > possible is a must!
>
> Ohh! (drooling at the thought of a kernel supported hot-swapable raid
> system) That would be a very nice addition right there. :)
> Would make all those "linux is not a REAL os" people shaddup...
Exactly! Raid is not that complex. Having hot swappability would add
a lot though.
> (Assuming at least some hardware out there will
> > support it. One trick often used by the hot-swappable hardware is
> > simply to build connectors where either power or a reset line always
> > breaks first and makes last.)
>
> Ah, that's a hardware issue. :) Seriously, if they can hack in support
> for dos-based hot swapping ISA drives (seen it done) then it shouldn't be
> too bad to use it in linux.
True, but not too difficult: I've seen simple edge connectors where they
just scrape off the ends of a couple pins. Even with SCSI-II, you should
be able to figure out how much to clip off appropriate pins.
Hopefully with the proper reset signal, the bus tri-states sufficiently.
Not sure if debounce is a problem though. Sliding pins might have noise.
> chaos@dynamic.ip.don't.reply Guess what? I really _DO_ speak for my
> Dan Merillat / Harik A'ttar system. And if you share my opinions,
> drm89121@pegasus.cc.ucf.edu you should seek professional help.
sdw
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