Hi guys,

On Centos 7 system and had a working tape storage system. Then I restarted and 
the whole thing stopped working.

I have just noticed that the autochanger changed from /dev/sg2 to /dev/sg3.  My 
initial thought was to use the device UUID, but this device don't seem to use 
UUID.  

I thought I could use the alternate name that I pulled from lsscsi command, but 
it looks like either the device driver or the script only want to use the 
device with sg prefix on the name

[root@eng-backup01 ~]# mtx -f /dev/sch0 status
/dev/sch0 is not an sg device, or old sg driver
[root@eng-backup01 ~]# 

So, how do you guys solve this problem so that it don't fall apart on every 
restart?

[root@eng-backup01 ~]# lsscsi -l
[0:2:0:0]    disk    DELL     PERC H710P       3.13  /dev/sda 
  state=running queue_depth=256 scsi_level=6 type=0 device_blocked=0 timeout=90
[0:2:1:0]    disk    DELL     PERC H710P       3.13  /dev/sdb 
  state=running queue_depth=256 scsi_level=6 type=0 device_blocked=0 timeout=90
[1:0:0:0]    tape    IBM      ULTRIUM-HH7      J4D1  /dev/st0 
  state=running queue_depth=256 scsi_level=7 type=1 device_blocked=0 timeout=900
[1:0:0:1]    mediumx QUANTUM  UHDL             0094  /dev/sch0
  state=running queue_depth=256 scsi_level=3 type=8 device_blocked=0 timeout=0
[root@eng-backup01 ~]# 


Regards,
William 

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