Multipath Duplicate Drives

I am setting up multipaths for Veritas backup on SAN storage. I noticed that lsblk shows duplicate disks, which is quite confusing. For example, both sdc and sdd represent the same disk, and similarly, sde and sdf represent the same device. sdc 8:32 0 50G 0 disk ├─sdc1 8:33 0 50G 0 part └─san69 253:10 0 50G 0 mpath └─san69p1 253:11 0 50G 0 part sdd 8:48 0 50G 0 disk ├─sdd1 8:49 0 50G 0 part └─san69 253:10 0 50G 0 mpath └─san69p1 253:11 0 50G 0 part sde 8:64 0 69G 0 disk ├─sde1 8:65 0 69G 0 part └─mpathb 253:12 0 69G 0 mpath └─mpathb1 253:13 0 69G 0 part /mnt sdf 8:80 0 69G 0 disk ├─sdf1 8:81 0 69G 0 part └─mpathb 253:12 0 69G 0 mpath └─mpathb1 253:13 0 69G 0 part /mnt multipath -ll output is as follow mpathb (360050763808106804800000000000001) dm-12 IBM,2145 size=69G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw |-+- policy='round-robin 0' prio=50 status=active | `- 11:0:1:1 sde 8:64 active ready running `-+- policy='round-robin 0' prio=10 status=enabled `- 11:0:3:1 sdf 8:80 active ready running san69 (360050763808106804800000000000000) dm-10 IBM,2145 size=50G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw |-+- policy='round-robin 0' prio=50 status=enabled | `- 11:0:3:0 sdc 8:32 active ready running `-+- policy='round-robin 0' prio=10 status=enabled `- 11:0:1:0 sdd 8:48 active ready running