Re: Udev and SCSI/Fiber channel devices

[Kay Sievers <kay@vrfy.org>]

On Tue, 2004-02-24 at 05:58, Patrick Mansfield wrote:
> 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?

It does, but only with DEBUG=true.
I will have a look. We may change some critical debug to info().

> 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.)

Strange, hotplug(8) mentions ACTION but not DEVPATH.
I will prepare a patch fot hotplug and put a few words in SYNOPSIS of
udev, tonight. 

> > 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"

Nice, so we can stay with the current logic.

thanks,
Kay



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