# This script will look at all Flashcopy mappings.
# For each Flashcopy Mappings, it will look at the source volume preferred id and if required
# change the target preferred node id to match the source.
# In the case where there are many cascaded Flashcopy
# it may take a couple runs of this script for all preferred nodes to be optimized
# If moving preferred path of a volume from one I/O group to an other, the movevdisk will fail. 
# This is normal.
# This script is provided as is with no warranty.
#
svcinfo lsfcmap -nohdr | 
while read item1 item1value
 do svcinfo lsfcmap $item1 |
 while read item2 item2value
 do 
  if [[ $item2 == "source_vdisk_id" ]]
    then SourceVdiskID=$item2value
  fi
  if [[ $item2 == "target_vdisk_id" ]]
   then TargetVdiskID=$item2value
   echo "lsfcmap: "$item1", SourceVdiskID: "$SourceVdiskID", TargetVdiskID: "$TargetVdiskID
   SourceVdiskPrefNodeID=$(svcinfo lsvdisk $SourceVdiskID |
   while read item3 item3value
   do
    if [[ $item3 == "preferred_node_id" ]]
    then 
     echo $item3value
     break
    fi
   done
   )
   TargetVdiskPrefNodeID=$(svcinfo lsvdisk $TargetVdiskID |
   while read item4 item4value
   do
    if [[ $item4 == "preferred_node_id" ]]
    then
     echo $item4value
     break
    fi
   done
   )
   echo "      Result: Source volume ID: "$SourceVdiskID" Preferred node ID: "$SourceVdiskPrefNodeID" target volume ID: "$TargetVdiskID" Preferred node ID: "$TargetVdiskPrefNodeID
   if [[ $SourceVdiskPrefNodeID == $TargetVdiskPrefNodeID ]]
    then echo "      Preferred node ok no change required" 
   else 
    echo "      Optimizing target volume to match source"
    movevdisk -node $SourceVdiskPrefNodeID $TargetVdiskID
    if [[ $? -eq 0 ]]
     then 
      echo "      movevdisk -node "$SourceVdiskPrefNodeID $TargetVdiskID"          Change successful" 
    else 
     echo "         ***   ERROR *** changing Preferred node: movevdisk -node "$SourceVdiskPrefNodeID $TargetVdiskID
     Echo "Cannot move preferred path to $SourceVdiskPrefNodeID for volume ID $TargetVdiskID related to Flashcopy Mapping $item1 $item1value"
     read -p "Pausing because of the error, press any key to continue..."
    fi
   echo "Pause for 2 seconds"
   sleep 2
   fi
  fi
 done
done