Re: Udev and SCSI/Fiber channel devices

[Patrick Mansfield <patmans@us.ibm.com>]

On Tue, Feb 24, 2004 at 03:22:14AM +0100, Kay Sievers wrote:
> On Tue, 2004-02-24 at 03:09, Sabharwal, Atul wrote:
> >  You can use scsi_id in a callout rule with udev for scsi persistent
> > names.
> > scsi_id is released along with udev under extras/scsi_id.
> > >>  I tried a callout rule as follows :
> > 
> >      CALLOUT="/sbin/scsid -p 0x80 -s /block/sda| awk ' {}; end { print$3 }'", BUS="scsi", ID="325687809", NAME="host_scsi"

It's scsi_id, not scsid.

Should udev log an error if it can't find the CALLOUT program?

You don't need any arguments, scsi_id relies on the environment variable
DEVPATH for the sysfs path, though it might be cleaner if we could use a
udev string substitution.

And, make sure you have at least one line in your /etc/scsi_id.config
like:

	options=-g

I will add a udev example to the scsi_id man page, and more about its
behaviour when called with no arguments, though the udev man has a fine
example.

DEVPATH should probably be documented somewhere, maybe in hotplug(8). (I
can't find anything about it in man pages of udev, udevinfo, or hotplug.)

> Huh, do we really need this complex callout argument line.
> We are not prepared for something like this, cause we pass
> only 7 arguments down to the program.
> If it's really needed, I can have look.
> Pat?

No. The above rule should just be:

BUS="scsi", CALLOUT="/sbin/scsi_id", ID="325687809", NAME="your_disk"

But if the device is really using page 0x80, the ID will likely have
spaces in it, so run scsi_id manually to verify the value needed in the
ID, including all spaces *especially* any trailing spaces, i.e. run:

/sbin/scsi_id -s /block/sda

-- Patrick Mansfield


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