Give a tape to a vm, but the tape change the host ID at reboot.

[Gianni]

Good morning,
a friend asked me an opinion on a problem that happens on a machine proxmox v 1.8.
He wants to give a tape to a vm.
No problem, fill in the file:

proxmox: ~ # cat /etc/scst.conf

[HANDLER tape]
DEVICE [6:0:3:0]

[ASSIGNMENT Default]
DEVICE [6:0:3:0], 0

The problem arises however when rebooting the virtualizer proxmox.
The tape changes the host ID [host:bus:target:lun] as you can see:

First reboot:
[6:0:3:0] tape HP Ultrium 1-SCSI P61D / dev/st0

Second:
[0:0:3:0] tape HP Ultrium 1-SCSI P61D / dev/st0

Third:
[4:0:3:0] tape HP Ultrium 1-SCSI P61D / dev/st0

our genial friend Diaolin advised us through a work arround with this script:

##Script creato per gestire il cambiamento dei map sui device
DEVICE=$(lsscsi | grep tape| awk '{print $1}' )


DEVICE=${DEVICE##*[}
DEVICE=${DEVICE%%]*}

cp /etc/scst.conf /etc/scst.conf.$$

echo -ne "
[HANDLER tape]
DEVICE ${DEVICE}

[ASSIGNMENT Default]
DEVICE ${DEVICE},0
" > /etc/scst.conf

/etc/init.d/scst reload

###Fine dello script creato per gestire i device

This work fine!
But we will understand why this happens?
I read here that if you have a device that is sometimes off line the kernel remap the following device sequentially. (Example iscsi)
http://www.linuxdocs.org/HOWTOs/SCSI-2.4-HOWTO/scsiaddr.html
Have you any idea?

Thanks in advanced,
Gianni

 

[dietmar]

You get that behavior when you boot the same kernel version? Or only when you boot into another kernel?

 

[Gianni]

The same kernel.
Alex type only reboot at prompt, with all vm stopped and when the proxmox restart the tupla [h:b:t:id] is changed.

Jan

 

[dietmar]

The same kernel.
Alex type only reboot at prompt, with all vm stopped and when the proxmox restart the tupla [h:b:t:id] is changed.

Maybe the SCST people knows the problem - please can you ask on the SCST list?