#a:b:c:d
a = Hostadapter ID
b = SCSI channel
c = Device ID
d = LUN
[root@srvvmcsh-29 ~]# dmesg | grep -i 'Attached SCSI disk'
[ 2.358230] sd 0:0:2:0: [sdc] Attached SCSI disk
[ 2.358297] sd 0:0:0:0: [sda] Attached SCSI disk
[ 2.360209] sd 0:0:1:0: [sdb] Attached SCSI disk
[ 2.362170] sd 0:0:3:0: [sdd] Attached SCSI disk