Subject: (fwd) An Ultrix device driver to stop and start disks
To: None <current-users@NetBSD.ORG>
From: Hubert Feyrer <>
List: current-users
Date: 04/23/1998 21:20:02
-------- forwarded-message -------------->
From: (Stuart Pook)
Newsgroups: comp.unix.ultrix,comp.sys.dec,comp.unix.bsd.openbsd.misc,comp.unix.bsd.netbsd.misc
Subject: An Ultrix device driver to stop and start disks
Date: 23 Apr 1998 14:02:33 +0200
Organization: GIS INFOBIOGEN
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Message-ID: <6hnakp$>
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Xref: comp.unix.ultrix:5967 comp.sys.dec:33911 comp.unix.bsd.openbsd.misc:851 comp.unix.bsd.netbsd.misc:8045

I have written a device driver for Ultrix (4.4 and up) on DECstations
that stops and starts SCSI disks.  With this driver, it is possible
to set a timeout on each disk. When the disk has been unused for that
length of time, the disk is stopped.  At the next disk access the disk
is restarted.  This a useful if you have lots of old noisy disks. You
can configure your system so that all the disks on your system will stop.

It is necessary to rebuild the kernel to install this driver but the
source to Ultrix is not required.

The URL has more
information and the GPLed source.

Does anybody want to add this sort of code to NetBSD or OpenBSD?

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Hubert Feyrer <>