Re: udev naming for scsi disk partitions

[Greg KH <greg@kroah.com>]

On Fri, Nov 07, 2003 at 11:53:29AM +0530, Surekha.PC wrote:
> 
> Please find my comments interspersed below with "=>" mark.
> 
> 
> > In sysfs the scsi device path looks as shown below.
> > 
> > The sysfs's "block" device path lists the block devices detected on 
> > the system. Here "sdc" is the iSCSI device and "sdc1" and "sdc2" are 
> > listed as 2 partitions on the iSCSI disk.
> > 
> > The device field below is pointing to the iSCSI host/bus/tgt/lun path.
> > 
> > #ls -l /sys/block/sdc
> > total 0
> > -r--r--r--    1 root     root         4096 Nov  7 08:25 dev
> > lrwxrwxrwx    1 root     root           35 Nov  7 08:25 device ->
> > ../../devices/legacy/host6/6:0:69:0
> 
> Hm, yeah that rule should have worked.  Mind enabling debugging in
> namedev.c by uncommenting the line: //#define DEBUG_PARSER
> at the top of the file?  If you rebuild udev, and then send me the
> syslog debug messages when you plug the device in, I'd really apreciate
> it.
> 
> => I have enabled the debug as mentioned above. Could you pls tell me
> where the messages are logged, "/var/log/messages" file doesn't have any
> ?

You need to tell syslogd to write the system wide debug messages
somewhere.  I have the following line in my /etc/syslog.conf:

*.debug         /var/log/debug

Restart syslogd and look in that file.

> > I think the sysfs file "/sys/block/sdc/sdc1" should be ideal to use 
> > for setting the LABEL rule as you have mentioned.
> 
> Hm, if it's always sdc1, why not just use a simple REPLACE rule?
> Something like the following rules should work for you:
> 
> REPLACE, KERNEL="sdc1", NAME="c6b0t69l01"
> REPLACE, KERNEL="sdc2", NAME="c6b0t69l02"
> 
> Will that work?
> 
> => But it need not be sdc1 always, a disk can have any number of
> partitions, then the config file will need to be changed always :(

Yes, you are correct, I just thought you said it would always be those
kernel names :)

How about any of the sysfs files?  Are they going to hold unique values?
The vendor file?  model file?

thanks,

greg k-h


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