How to Enabling Multipath I/O for an Existing Root Device

i have attached one boot lun in my server with multipath (4 paths), during installation installed SLES 12 sp1 on single path (/dev/sda), now i am trying to enable multipath on existing root file system, anybody has idea how to do it?

Four paths:
/dev/sda (OS installed)
/dev/sdb
/dev/sdc
/dev/sdd

Thanks
Mahesh

jackmahesh,

It appears that in the past few days you have not received a response to your
posting. That concerns us, and has triggered this automated reply.

These forums are peer-to-peer, best effort, volunteer run and that if your issue
is urgent or not getting a response, you might try one of the following options:

Be sure to read the forum FAQ about what to expect in the way of responses:
http://forums.suse.com/faq.php

If this is a reply to a duplicate posting or otherwise posted in error, please
ignore and accept our apologies and rest assured we will issue a stern reprimand
to our posting bot…

Good luck!

Your SUSE Forums Team
http://forums.suse.com