multipath problem

Please i'm presently having a challenge with dm-multipath, i need somebody to please help.
I just added another disk to extend my existing volume but i discover that my existing multipath is scattered.

Existing disk multipath

[root@exabkp /]# multipath -d
create: mpath0 (36001438005df018b0000b00001e30000) undef HP,HSV450
size=5.9T features='0' hwhandler='0' wp=undef
|-+- policy='round-robin 0' prio=50 status=undef
| |- 9:0:1:1 sdh 8:112 undef ready running
| `- 7:0:1:1 sdd 8:48  undef ready running
`-+- policy='round-robin 0' prio=10 status=undef
  |- 9:0:0:1 sdf 8:80  undef ready running
  `- 7:0:0:1 sdb 8:16  undef ready running


New disk multipath:

[root@exabkp /]# multipath -ll