Date: Wed, 17 Mar 1999 23:16:47 -0500 (EST) From: "Matthew N. Dodd" <winter@jurai.net> To: "Kenneth D. Merry" <ken@plutotech.com> Cc: joerg_wunsch@uriah.heep.sax.de, freebsd-scsi@FreeBSD.ORG Subject: Re: SONY SMO-C501-09 not recognized under CAM Message-ID: <Pine.BSF.4.02.9903172241210.2158-100000@sasami.jurai.net> In-Reply-To: <199903160607.XAA23750@panzer.plutotech.com>
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On Mon, 15 Mar 1999, Kenneth D. Merry wrote:
> One question I have is this -- once the media is spinning, how long
> does it take to do a read capacity? You can find out like this:
>
> /usr/bin/time camcontrol cmd -t 60 -v -n da -u 2 -c "25 0 0 0 0 0 0 0 0 0" -i 8 "i4 i4"
<SONY SMO-C501-00 2.07> at scbus2 target 3 lun 0 (pass13,da5)
576998 512
0.04 real 0.01 user 0.01 sys
> What happens if the media is not spinning and you do a read capacity?
> Does the drive try to spin itself up?
eisa-test# camcontrol stop -n da -u 5
Unit stopped successfully
eisa-test# camcontrol tur -n da -u 5
Unit is not ready
eisa-test# /usr/bin/time camcontrol cmd -t 60 -v -n da -u 5 -c "25 0 0 0 0
0 0 0 0 0" -i 8 "i4 i4"
576998 512
0.04 real 0.00 user 0.02 sys
eisa-test# camcontrol tur -n da -u 5
Unit is not ready
It doesn't spin it up if its been spun down.
> The default timeout for the read capacity in the DA driver is 5
> seconds. If the MO drive attempts, for whatever reason, to spin itself
> up when it gets a read capacity, we may need to bump the timeout on
> the read capacity commmand.
Once the drive eats the disk it reads the capacity. My unit doesn't -not-
do a read capacity. I haven't seen it 'forget' the capacity either.
I just hooked up a second unit to the system and booted w/o a media unit.
A start/tur on the pass device followd by a rescan doesn't result in the
device being attached to the da driver.
Any chance that camcontrol could gaing the ability to remove a device from
the system? 'camcontrol detach' maybe?
--
| Matthew N. Dodd | 78 280Z | 75 164E | 84 245DL | FreeBSD/NetBSD/Sprite/VMS |
| winter@jurai.net | This Space For Rent | ix86,sparc,m68k,pmax,vax |
| http://www.jurai.net/~winter | Are you k-rad elite enough for my webpage? |
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