SLES11 / udev rules / tape media changer

[xunil321]

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

[deano_ferrari]

Your rule looks ok to me, but I wonder if an earlier rule with 'OPTIONS+="last_rule"' is being processed, preventing yours from being applied. (Just a guess). You could try renaming your rule to 5-tape,rules or similar with the last_rule option included and see how that goes.

This key might work for you:

KERNEL=="sg[0-9]*"

[xunil321]

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

Rainer

[deano_ferrari]

Good work. Yes, another key was worth a go!