A stripe expansion will give you the best performance but the space will not be immediately available. Concatenation will provide immediate access to the storage but will not improve performance.

To expand using a stripe the LUNs have to be the same RAID type and size. To concatenate they do not have to be the same RAID type or size.

See the Navisphere Admin guide for more details.

Hope this helps,
Aran

Well, I noticed a couple things.

I moved the LUN out of the storage group. I then expanded the moved 6G LUN with a new 6G LUN and used the total 12G. I now have (2) Private LUNS showing instead of my single LUN.

What did I do wrong?

First, thank you for the good feedback here.

Since they are "Private" now they will not let me place it back in the Storage Group to be used again.

I will follow up on your link.

NCESC,
The behaviour you experienced sounds normal. See the section on metaLUNs in the Navisphere Admin Guide at:
Support > Documentation/White Paper Library > Software ~ J-O ~ Documentation > Navisphere Management Suite > Maintenance/Administration

In short, the LUNs in a meta become private LUNs and the metaLUN ID takes the ID of the base LUN.

now LUN 17 has become a meta lun ...it will have a different icon ..in navisphere expand SPA or SPB under physical components ..and you should find it.

on any type *nix system i would recommend you do not expand luns, rather provision new luns and your use native volume manager to expand capacity.

Thank you dynamox, I will follow up with our sys admin on that.

Any note on how to remove the "Private" status on this now? I had LUN 17, did the expand process with LUN19 and now have (2) separate LUNS (17,19) showing up as "Private" that were not there before.