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

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