Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!usc!rpi!crdgw1!sixhub!davidsen
From: davidsen@sixhub.UUCP (Wm E. Davidsen Jr)
Newsgroups: comp.unix.sysv386
Subject: Re: ISC 2.2 Hangs on disk I/O
Message-ID: <3446@sixhub.UUCP>
Date: 17 Mar 91 22:13:47 GMT
References: <24113@hydra.gatech.EDU>
Reply-To: davidsen@sixhub.UUCP (bill davidsen)
Organization: *IX Public Access UNIX, Schenectady NY
Lines: 26

In article <24113@hydra.gatech.EDU> doug@pravda (Doug MacKenzie) writes:
| I have a Modular Circuit Technology's 25MHz cache 386 system.
| I have a Western Digital WD1006V-SR2 RLL controller with a Segate

|   Some times during disk I/O, the disk light will just stay on solid
|   and the system is locked up.  I can not get any response other than
|   turning the stupid thing off.

| Does anyone have any ideas?

  I think I know what the problem is, you see this with 1006 and 1007
disk controllers. SCO put a fix in their driver for it, which cure the
problem. ISC hasn't figured it out, as far as I know, and at one time
was blaming it on the controller.

  This family of controllers has a possibility of returning interrupts
in an unusual way. Since it's documented to be possible I can't call it
a bug. Replacing the controller will probably fix it, switching to SCO
will definitely fix it.

  ISC may have a fix by now, I haven't been tracking it.
-- 
bill davidsen - davidsen@sixhub.uucp (uunet!crdgw1!sixhub!davidsen)
    sysop *IX BBS and Public Access UNIX
    moderator of comp.binaries.ibm.pc and 80386 mailing list
"Stupidity, like virtue, is its own reward" -me