Re: Udev and SCSI/Fiber channel devices

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

On Tue, Feb 24, 2004 at 10:11:31AM -0800, Sabharwal, Atul wrote:
> The output of command /sbin/scsi_id -s /block/sda giver <vendor, model,
> serialnumber> .
> I can put -p 0x80 but it defaults to page 0x80 anyway.  
> 
> The reason to separate the three field with awk was to have exact match
> without worrying
> about spaces. Putting vendor, model number information in a udev rule
> does not belong
> Over there.  In fact, if like scsi_id, it was okay to have an custom
> callout programs
> And use their output to match the RESULT field, that would be great. 

It's normal to use vendor and model in udev rules.

Page 0x80 gives a unique serial number only for a given vendor and model,
so if you use only the serial number, it is possible though perhaps
unlikely that it will collide with other ID's.

> The reason I am explotring CALLOUT is to have a method to give
> persistant device names
> Using bus#, chasis# & slot#. 

If you want to name based on position or hardware location you don't want
to use scsi_id, you probably want to key off of the bus id, plus other
sysfs host adapter (i.e. pci) attributes.

-- Patrick Mansfield


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