[NTLUG:Discuss] Re: udev - how do get it to create a tape /dev? *solved - maybe*

[Richard Geoffrion]

Richard Geoffrion wrote:

> The SCSI Generic driver is loaded, the system sees the tape drive AND 
> the robotic arm (lun 1), and the tape drive is right there under 
> /dev/sg10 with the changer being /dev/sg11.  The problem is that those 
> device numbers won't always be the same depending on how many of the 
> hot pull SCSI drives are in the bays when the system powers up.  With 
> UDEV creating these devices on the fly, I need a way to have a stable 
> /dev/$name created so that I don't have to hit a moving target.
>
> I've searched in vain for examples and I'm coming up empty trying to 
> find the documentation on how to make udev auto create a stable 
> /dev/$name. 
> While putting together documentation and proof of how all of my 
> searches for help failed, I found
> http://www.reactivated.net/writing_udev_rules.html  .   I can't say 
> enough good things about this documentation!  The guy uses EXAMPLES!!! 
> I am ALMOST  in heaven --- almost because I still seem to be stuck.

I guess it helps when you have the drivers loaded for the devices..

/sbin/modprobe st   #load the ScsiTape driver
/sbin/modprobe ch  #load the scsi-CHanger driver

<whoo-hoo'age>
login at gwibkp:/dev$ ls -l *st*
crw-rw----  1 root root  9, 128 2006-01-25 14:02 nst0
crw-rw----  1 root root  9, 224 2006-01-25 14:02 nst0a
crw-rw----  1 root root  9, 160 2006-01-25 14:02 nst0l
crw-rw----  1 root root  9, 192 2006-01-25 14:02 nst0m
crw-rw----  1 root cdrom 9,   0 2006-01-25 14:02 st0
crw-rw----  1 root cdrom 9,  96 2006-01-25 14:02 st0a
crw-rw----  1 root cdrom 9,  32 2006-01-25 14:02 st0l
crw-rw----  1 root cdrom 9,  64 2006-01-25 14:02 st0m
</whoohoo>

I wonder why group cdrom is the owner of the /dev/st* devices....

at any rate... I'm off to go try to actually USE the drive! :)

-- 
Richard