discover newly addded LUN

what type of HBAs do you have in your system ? Each vendor provides a little script that can assist with detecting new LUNs, but even then it's not bullet proof.

if you are using emulex driver 8.x ...take a look here:

http://www-dl.emulex.com/support/linux/801617/pdf/manual.pdf

look for section "Dynamically Adding LUNs and Targets"

I'm using emulex.

Ok found the the script and run it..

After the scan.. I run again powermt display dev=all

This time it detected the LUN 2 but there is no associted Pseudo name???

Any advise?

I think I'm close.

thanks! it works..

Last question
Let say you have 500/gb of LUN and you want to use it as one volume of ext3 of 500GB.

Do you still have to use fdisk? or no need and run straight mkfs.ext to format?
just worried about lun misalignment just in case..

fdisk the drive first and set recommended alignment and then mkfs it. Align only on new LUNs as partition table will be rewritten and all data on the LUN destroyed.

Sorry I didnt get you on this..

Can you elaborate?

Do I still to run fdisk? eventhough, I will have only one big partition?
thanks

yes, still run fdisk. Even though it's only one partition you want to make sure it's properly aligned.

Thanks Mate., you really helped me alot.