HOWTO: DISK MAPPING TO CLIENT FROM DUAL VIOS USING VSCSI AND MPIO

Pre-Checks:

• Update the adapter settings:

   # chdev -l fscsi0 -a fc_err_recov=fast_fail 
   # chdev -l fscsi0 -a dyntrk=yes

• Make sure that exported Lun exported from SAN should be available  in both the VIOS which is going to be mapped to client lpar through vscsi.

• Set reserve_lock  to no for the disk which was added in both the vios from SAN.

    Use the below commands to set it to no

   #chdev -l hdisk1 -a reserve_lock=no   
   #chdev -l hdisk1 -a reserve_lock=no  -P 
   #

• Pre-check  whether disk was by mistakenly  used in any other client already 

     #lqueryvg -Atp hdisk1

     root@vio1:/ #lqueryvg -Atp hdisk1

     0516-320 lqueryvg: Physical volume hdisk1 is not  
      asigned   to  a volume group.

     0516-066 lqueryvg: Physical volume is not a volume group            member.

     Check the physical volume name specified.

     root@vio1:/ #

Map the disk to the client from both the  vios 

check the diagram

vioa

#mkvdev -vdev hdisk1 -vadapter vhost1 -dev myvio1clivtd

Viob 

#mkvdev -vdev hdisk2 -vadapter vhost1 -dev myvio2clivtd

Now in client:

Run config manager 

#cfgmgr 

root@cli1:/ #lspv

hdisk0          0004a256f06e0c6e      rootvg        active

hdisk1          0004a25613b2835f      datavg

hdisk2          0004a25613b287f1      datavg

hdisk3          0004a2561dc9d8bd      datavg

hdisk4          0004a2561dd57f15      datavg

hdisk5          0004a2561da57f16      None

root@cli1:/ #

Check the paths 

root@orange-lpar:/ #lspath -l hdisk5
Enabled hdisk5 vscsi1
Enabled hdisk5 vscsi2

Check the path priorities

 # lspath -AE -l hdisk5 -p vscsi1

   priority 1 Priority True

 # lspath -AE -l hdisk5 -p vscsi2

   priority 1 Priority True

set path which was  from  viob to 2

 # chpath -l hdisk5 -a priority=1 -p vscsi1

 # chpath -l hdisk5 -a priority=2 -p vscsi2

Its done now ...