SLES11 / udev rules / tape media changer
 

Dear all,
at our SLES11 server there is an iscsi tape roboter from OVERLAND attached.
From this great list we learnt to use udev rules in order to fix the device name
for the media changer /dev/sgN where N is altering after each reboot.
Here is the udevinfo output of our tape changer:

#udevinfo -a -p $(udevinfo -q path -n /dev/sg5)

looking at device
'/devices/platform/host4/session1/target4:0:0/4:0:0:2/scsi_generic/sg5':
KERNEL=="sg5"
SUBSYSTEM=="scsi_generic"
DRIVER==""

looking at parent device
'/devices/platform/host4/session1/target4:0:0/4:0:0:2':
KERNELS=="4:0:0:2"
SUBSYSTEMS=="scsi"
DRIVERS==""
ATTRS{device_blocked}=="0"
ATTRS{type}=="8"
ATTRS{scsi_level}=="6"
ATTRS{vendor}=="OVERLAND"
ATTRS{model}=="NEO Series "
ATTRS{rev}=="0510"
ATTRS{tgps}=="1"
ATTRS{state}=="running"
ATTRS{timeout}=="0"
ATTRS{iocounterbits}=="32"
ATTRS{iorequest_cnt}=="0xe"
ATTRS{iodone_cnt}=="0xe"
ATTRS{ioerr_cnt}=="0x3"
ATTRS{modalias}=="scsi:t-0x08"
ATTRS{evt_media_change}=="0"
ATTRS{queue_depth}=="32"
ATTRS{queue_type}=="none"

Therefore we built a new rule called 100-local.rules in /etc/udev/rules.d with
this line:

KERNEL=="sg*", SUBSYSTEMS=="scsi", ATTRS{rev}=="0510", SYMLINK+="loader0"

After running /etc/init.d/boot.udev restart we would expect to see
/dev/loader0. But it does'nt exist, why?

THX for any hint advice,
Rainer

You could try "udevadm monitor" before attaching the device to try debugging the problem.

Look if earlier rules are triggered instead or if a different raw scsi device is assigned.

I got it: SUBSYSTEMS=="generic_scsi" is the solution

Rainer