Backup Central

Hi All,

Performing a test upgrade of our Debian Squeeze server to the new Wheezy release has broken the mtx package.

MTX relies on a /dev/sg* device (under Squeeze, the autochanger was /dev/sg4) - however under Wheezy there is only /dev/sch0.

Trying to run mtx against it returns:

mtx -f /dev/sch0
/dev/sch0 is not an sg device, or old sg driver

lsscsi -g
[0:0:32:0] enclosu DP BACKPLANE 1.05 - -
[0:2:0:0] disk DELL PERC 6/i 1.22 /dev/sda -
[1:0:0:0] cd/dvd HL-DT-ST DVD-ROM GDR-T10N 1.02 /dev/sr0 -
[3:0:17:0] tape IBM ULT3580-TD4 B710 /dev/st0 -
[3:0:17:1] mediumx IBM 3573-TL 9t30 /dev/sch0 -
[3:0:18:0] tape IBM ULT3580-TD4 B710 /dev/st1 -


This is possibly a link to someone encountering the same problem: https://groups.google.com/forum/?fromgroups#!topic/linux.debian.bugs.dist/6thALMZOr8k

Anyone got any ideas?

On 6/07/2012 5:41 AM, comport3 wrote:
Hi All,

Performing a test upgrade of our Debian Squeeze server to the new Wheezy release has broken the mtx package.

MTX relies on a /dev/sg* device (under Squeeze, the autochanger was /dev/sg4) - however under Wheezy there is only /dev/sch0.

Trying to run mtx against it returns:

mtx -f /dev/sch0
/dev/sch0 is not an sg device, or old sg driver

lsscsi -g
[0:0:32:0] enclosu DP BACKPLANE 1.05 - -
[0:2:0:0] disk DELL PERC 6/i 1.22 /dev/sda -
[1:0:0:0] cd/dvd HL-DT-ST DVD-ROM GDR-T10N 1.02 /dev/sr0 -
[3:0:17:0] tape IBM ULT3580-TD4 B710 /dev/st0 -
[3:0:17:1] mediumx IBM 3573-TL 9t30 /dev/sch0 -
[3:0:18:0] tape IBM ULT3580-TD4 B710 /dev/st1 -


This is possibly a link to someone encountering the same problem: https://groups.google.com/forum/?fromgroups#!topic/linux.debian.bugs.dist/6thALMZOr8k

Anyone got any ideas?

Yes, I raised that Debian bug/wish-list item:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=657948

I have just held my udev package at the version that isn't broken (Debian package version 172-1).
But for a fresh install that wouldn't be an option.

The change removed the following lines from /lib/udev/rules.d/80-drivers.rules

SUBSYSTEM=="scsi", ENV{DEVTYPE}=="scsi_device", TEST!="[module/sg]", \
RUN+="/sbin/modprobe -b sg"

You you probably put that rule into your own local file underneath the /etc/udev/rule.d/ directory.
Failing that, manually running '/sbin/modprobe -b sg' at the right time would probably also do the trick.

Regards,

----------
Jim Barber
DDI Health

Jim, you are truly a life saver! Thank you very, very much!!!

On 6/07/2012 12:37 PM, comport3 wrote:
Jim, you are truly a life saver! Thank you very, very much!!!

FYI, Debian has just closed this bug today.
Version 175-4 of the udev package will re-enable the sg devices again.
It isn't in Debian testing yet as far as I can see, but I guess will filter down in a few days.

Regards,

Jim Barber
Senior Systems Administrator
Primary Health Care Limited
Innovations & Technology Group