[Info-vax] Processes hang on USB-access
abrsvc
dansabrservices at yahoo.com
Thu Feb 17 14:27:16 EST 2022
On Thursday, February 17, 2022 at 2:07:29 PM UTC-5, Dave Froble wrote:
> On 2/17/2022 4:15 AM, Joukj wrote:
> > Hi all,
> >
> > I have an 2 TB USB-disk attached to a DPWS500 running OpenVMS Alpha V8.4-2L1.
> > After a couple of hours to couple of days the process reading/writing to the
> > disk seems to hang on the disk access. When some other process tries to access
> > this disk in this state, it also hangs. A normal reboot of the machine is not
> > possible anymore since also the dismount of the disk hangs. I have to reset the
> > machine.
> >
> > No errors are logged for the device.
> >
> > What could be the problem and how can I avoid processes hanging on access to
> > this disk?
> >
> > I already changed the USB-disk for a brand new one and I changed the machine to
> > which it is connected. I think I also tried a XP1000.
> >
> >
> > regards
> > Jouk
> I seem to recall that the USB implementation on older systems from DEC was less
> than great. You may discover the problem with a system dump and SDA, but, then
> what?
>
> --
> David Froble Tel: 724-529-0450
> Dave Froble Enterprises, Inc. E-Mail: da... at tsoft-inc.com
> DFE Ultralights, Inc.
> 170 Grimplin Road
> Vanderbilt, PA 15486
As with any "problem", knowing what exactly is wrong yields a potential solution. With a nebulous report of "hangs", there is nothing to go on here. Is the process waiting for an I/O completion that was missed or never occurred? An examination of the dump would answer this question. Perhaps there is a code path that results in a deadlock and that is what happened here. Who knows without additional investigation?
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