pvcreate fails while using multipath device

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I am trying to use a multpath device (SAN) to create a logical volume using LVM. But the pvcreate fails to initialize the disk

# pvcreate /dev/mapper/mpathb
  Device /dev/mapper/mpathb not found (or ignored by filtering).

So then I tried adding a partition and re-attempted to initialize the disk. It still failed.
~~~

# parted /dev/mapper/mpathb print
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/mpathb: 22.0TB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt

Number  Start   End     Size    File system  Name     Flags
 1      2097kB  22.0TB  22.0TB               primary  lvm

# pvcreate -v /dev/mapper/mpathbp1
  Device /dev/mapper/mpathbp1 not found (or ignored by filtering).

Status of mulitpath device:

# multipath -l mpathb
mpathb (36000d31000afae00000000000000000e) dm-2 COMPELNT,Compellent Vol
size=20T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
  |- 1:0:0:1 sdc 8:32  active undef running
  |- 3:0:0:1 sdb 8:16  active undef running
  |- 1:0:3:1 sdh 8:112 active undef running
  `- 3:0:3:1 sdi 8:128 active undef running

Any help/advice is appreciated?

KM

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