Date: Sun, 12 Oct 1997 01:36:18 -0700 From: John-Mark Gurney <gurney_j@efn.org> To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de> Cc: scsi@FreeBSD.ORG Subject: Re: Trouble with dump on ncr Message-ID: <19971012013618.36452@hydrogen.nike.efn.org> In-Reply-To: <19971012094515.RT52487@uriah.heep.sax.de>; from J Wunsch on Sun, Oct 12, 1997 at 09:45:15AM %2B0200 References: <19971011091605.32335@mi.uni-koeln.de> <199710120615.AAA18578@pluto.plutotech.com> <19971012094515.RT52487@uriah.heep.sax.de>
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J Wunsch scribbled this message on Oct 12:
> As Kenneth Merry wrote:
>
> > FWIW, that's what the new CAM SCSI code does. The da (i.e. sd)
> > driver does a read capacity upon open. If the read capacity returns with
> > 0x04, 0x02 ("Logical unit not ready, initializing cmd. required"), the error
> > recovery code issues a start unit command to the drive.
>
> Hmm, why doing it at open time? Quite a number of people have been
> asking for a disk auto-spindown in the past (for filesystems that are
> seldom used). I'm using a crock of an auto-spindown in the od driver
> (the device is spun down at close time, and spun up at open time), but
> i think the more generic solution would be to trigger the spindown by
> a period of disc inactivity. Then, simply try the next command, and
> if the drive is not ready, attempt to start it, and retry.
actually.. I'm about to get the CAM scsi code up and running on a test
box of mine (ahc2842 w/ an IBM WDS-3200 !J S560)... and would VERY
much like to have this hd auto spin down... right now it's open air and
is quite loud...
hmm... would a simple timeout that is rescheduled upon no remaining
commands outstanding for the drive work? (I haven't looked at the
CAM scsi code yet, so I don't know how this would work exactly)
--
John-Mark Gurney Modem/FAX: +1 541 683 6954
Cu Networking
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