[241] in linux-scsi channel archive
My Plextor locks up under Linux. Why?
daemon@ATHENA.MIT.EDU (Mark Gleaves)
Sun Jun 11 18:38:00 1995
Date: Sun, 11 Jun 1995 17:01:57 -0500 (CDT)
From: Mark Gleaves <mgleaves@Venus.mcs.com>
To: linux-scsi@vger.rutgers.edu
Does anyone else have a problem with their Plextor 4Plex CD-ROM drive
locking up under Linux?
I have a Plextor model PX-4XCH quad-speed CD-ROM drive that often
locks up if I access it after long periods of inactivity. For example:
The other night I mounted a CD and then forgot about it. I started up X
and spent some time reading my mail across a SLIP link and doing some other
stuff. About two hours later I tried to do an "ls" on the directory
where I had mounted the CD. It hung. The light on the SCSI controller
was on solid and I had to reboot.
I've had this same problem with kernel 1.1.59 and all of the 1.2.x kernels
I've tried. It has occurred when I've had the CD-ROM drive connected to
both an NCR53c810 controller and to the BusLogic 946C controller I'm
currently using.
What I find most peculiar is that, most of the time, the drive works fine.
If I mount a disk and immediately start using it, I never seem to have a
problem. It's only when I try to access a mounted disk after a long
period of CD-ROM inactivity that I see the lock ups.
Since this problem seems to happen with two (very?) different SCSI
controllers, I've got to believe that it's almost certainly not a bug
in the low-level driver code. I've checked and rechecked the termination
and I've swapped the cable (all my drives are internal), without any
noticeable change.
At this point I think there are three likely possibilities for the
source of my problems:
1. A bug in the mid-level Linux SCSI code (doubtful).
2. A bug in the Plextor firmware.
3. It's just my drive that's broken.
Any ideas? Am I the only person who uses a Plextor 4Plex with Linux?
Thanks,
Mark Gleaves
--
Mark Gleaves mgleaves@mcs.com
