......................................................................
Removing and adding back "Backing device"
For removing refer to ./using_rmbdsp.html ( also see link in main doc )

NOTE: 

Can only be done if the DB connection is working.
You can test this by running serveral of the SSP commands i.e

a) $ cluster -status -clustername [cluster-name]
b) $ lssp -clustername [cluster-name] -sp [storage-pool-name] -bd

Tested on VIO 2.2.1.4


Check mapping on vhost3:
$ lsmap -vadapter vhost3

SVSA      Physloc                                Client Partition ID
--------- -------------------------------------- ------------------
vhost3    U9117.MMB.064252P-V3-C40               0x00000013

VTD       NO VIRTUAL TARGET DEVICE FOUND


Assign Backing Device to vhost3:

$ mkbdsp -clustername ztrans -sp ztrans_sp 10G -bd v1_01_rootvg -vadapter vhost3
Lu Name:v1_01_rootvg
Lu Udid:748de5724270a6666faa8a7242432d45

Assigning file "v1_01_rootvg" as a backing device.
VTD:vtscsi0


Re-check mapping on vhost3:
$ lsmap -vadapter vhost3

SVSA      Physloc                              Client Partition ID
--------- ----------------------------------- ------------------
vhost3    U9117.MMB.064252P-V3-C40             0x00000013

VTD                   vtscsi0
Status                Available
LUN                   0x8100000000000000
Backing device        v1_01_rootvg.748de5724270a6666faa8a7242432d45
Physloc
Mirrored              N/A


Add back Backing Device:
$ cfgdev ( optional )
$ mkbdsp -clustername ztrans -sp ztrans_sp -luudid 748de5724270a6666faa8a7242432d45  -vadapter vhost3

Lu Name:v1_01_rootvg
Lu Udid:748de5724270a6666faa8a7242432d45

Assigning file "v1_01_rootvg" as a backing device.
VTD:vtscsi0


Re-check mapping on vhost3:
$ lsmap -vadapter vhost3
SVSA       Physloc                              Client Partition ID
---------- ------------------------------------ ------------------
vhost3     U9117.MMB.064252P-V3-C40             0x00000013

VTD                   vtscsi0
Status                Available
LUN                   0x8100000000000000
Backing device        v1_01_rootvg.748de5724270a6666faa8a7242432d45
Physloc
Mirrored              N/A