How to find which scsi device you have.

Find out how to specify their control address (/dev/sg2 or /dev/sg4 ) on the Changer Device = Bacula ( my example)

1) check the command lssci if not found then install

#yum install lsscsi

#[root@inf1sysadm1 ~]# lsscsi -dg
[0:0:0:0] disk ATA WDC WD1600BEVT-7 11.0 /dev/sda [8:0] /dev/sg0[21:0]
[3:0:0:0] cd/dvd MATSHITA DVD+-RW UJ-875S D200 /dev/sr0 [11:0] /dev/sg1[21:1]


[root@inf1sysadm1 ~]# cat /proc/scsi/sg/
allow_dio def_reserved_size devices version
debug device_hdr device_strs
[root@inf1sysadm1 ~]# cat /proc/scsi/sg/device_hdr
host chan id lun type opens qdepth busy online
[root@inf1sysadm1 ~]# cat /proc/scsi/sg/devices
0 0 0 0 0 1 31 0 1
3 0 0 0 5 1 1 0 1