don't know of another way to migrate to larger LUN, MetaLUN should work. Use concat and the target LUN should be availabe in the list.

what kind of expansion are you trying to do ? It's not recommended to do an striped expansion where component LUNs reside in the same raid group.

the migration takes too long. is there a better way to migrate a 50gb rdm lun to a 150gb rdm lun?

Another way could be create a new larger lun, attach to server and then use EMcopy to perform a file level copy or OpenMigrator to perform a volume level copy (in the end you have to expand the volume).

S.

yes that works. thank you. so metalun across rgs gives better performance over single rg?

yes, mode spindles at work ..just remember not to create striped MetaLUNs where component LUNs share same RG

They have to be the same number of blocks.

S.

how identical do they have to be in size?

lun1 is 119.587

lun2 is 120

but it does not work

when i create lun1 from rg1 and a lun2 from rg2.

then i try to expand lun1, concat shows lun2 available, but striping does not show lun2 available.

why is that?