Date: Sat, 16 May 1998 11:32:24 -0400 From: Randall Hopper <rhh@ct.picker.com> To: Julian Elischer <julian@whistle.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Rescanning SCSI-Bus without Rebooting? Message-ID: <19980516113224.A10553@ct.picker.com> In-Reply-To: <355CDE1B.6201DD56@whistle.com>; from Julian Elischer on Fri, May 15, 1998 at 05:30:19PM -0700 References: <19980514220155.B20919@ct.picker.com> <Pine.BSF.3.95.980514192123.12079A-100000@current1.whistle.com> <19980515192717.A8491@ct.picker.com> <355CDE1B.6201DD56@whistle.com>
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Julian Elischer:
|Randall Hopper wrote:
|> SCENARIO 1 : SCANNER OFF, BOOT UP FREEBSD, THEN TURN SCANNER ON
|> # dmesg | grep uk0
|> # echo < /dev/uk0
|> /dev/uk0: Device not configured.
|> # scsi -f /dev/uk0 -d 255
|use scsi -f /dev/rsd0 -r
|
|remember WHAT scsi device you use is irrelevant. you just need one
|that IS there.. (any one).
Oh! [light goes on], OK. Thanks. Now I see the disconnect.
Specifying an already-attached device to reprobe another device not yet
attached seemed so odd it just didn't even register.
I just tried this, and this will work for my situation. I have a ZIP on
sd0, but unfortunately I have to go dig up a disk to stick in it for "scsi
-f /dev/rsd0 -r" not to return "Device not configured".
Now that we're on the same page, you may find my trials getting here a bit
amusing, and possibly could help me with where I've gone wrong trying to
get -p to work (sounds like that's the best option):
1. Earlier in the this thread, you mentioned:
|use the scsi -r command. you will need to use it against an already
|existing device, e.g. /dev/rsd0
|man 8 scsi
By existing, I thought you meant that the special device file existed
in /dev). Not that a physical device had been probed and successfully
attached to the existing device file (and in the ZIPs case, that a
disk had been loaded).
2. In scsi(8), it says this "-r" form of scsi isn't needed in FreeBSD >=
2.1 since "opening a fixed SCSI device has the side effect of
reprobing it".
When I reopened the wired-down /dev/uk0, no such reprobe/attach
seemed to occur -- it was still "Device not configured".
3. scsi(8) goes on to say in the reprobe paragraph:
and probing with the bus with the -p option should bring on line
any newly found devices. See scsi(4) for a description of fixed
scsi devices.
a. (nit) scsi(4) didn't even contain the word fixed.
b. Following up on -p (mentioned above), scsi(8) also goes on to say:
The -p option can be used against the "super scsi" device
/dev/scsi/super to probe all devices with a given SCSI lun on a
given SCSI bus. The bus can be selected with the -b option and
the default is 0. The lun can be selected with the -l option and
the default is 0. See scsi(4) for a description of the "super
scsi" device.
c. It sounded like -p was what I wanted. So to try -p, I built a
kernel with SuperSCSI ("su" & "ssc"), but I couldn't figure out how
to mknod the "scsi/super" SuperSCSI device. There was no reference
to it in MAKEDEV.
So I'm not sure how to use -p, or if it still works. Brian Somers
mentioned it earlier in this thread I noticed, so I assume there's
"some" way to use it.
|if not try the device ssc (if you configured it in) After that you can
|use uk..
This sounds like it'd be the best option for me (so I don't have to go find
a ZIP disk to load into my ZIP drive to be able to use "scsi -r").
So I guess my question here is, what device file path do I specify for the
"scsi -p" command line?:
# scsi -f /dev/uk0 -p -b 0 -l 6
scsi: unable to open device /dev/uk0: Device not configured
# scsi -f /dev/rsd0 -p -b 0 -l 6
scsi: unable to open device /dev/rsd0: Device not configured
# cd /dev
/dev # sh MAKEDEV ssc
ssc - no such device name
/dev # sh MAKEDEV scsi/super
scsi/super - no such device name
/dev # ls -l ssc* scsi/*
ls: No match.
Thanks. I appreciate your help!
Randall
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