Discs ASM on EBS. Increase the size?

Hello

My apologies if this is in the wrong forum...

In any case, I'm experimenting in the EC2 cloud. (After considerable bother...), I have a database of 11.2 oracle running with a pair of ASM starts. I decided to try and increase the size of one of my groups of disks.
I couldn't really find ' how - to of "on this subject so decided to jump in full. I took the following approach.

Closing database
Disassemble the asm diskgroup
detach the ebs volumes (there 6 in my diskgroup).
snapshot volumes s3
create new larger volumes of the photos above.
attatch the new volumes
-Here, the plan was to go back the asm diskgroup and finish.
HOWEVER... it really happened that way.

ORA-15017: diskgroup "RECON" can not be mounted.
ORA-15063: ASM discovered an insufficient number of drives for diskgroup "RECCE".

I kinda messed up with oracleasm, verification that he could see the disks etc., reload etc all without success.

I restarted the server and, Lo and behold, all my starts returned. With the new volumes. I was going to congratulate me when I noticed that the diskgroup was still the same size as before!
I tried a resizing of the disk group, but that did not help either.

So, my questions are

(1) how can I increase the size of the disks?
(2) this valid approach is at all?
(3) are there documents anywhere that tell me exactly how to perform this kind of operation?

Thanks for your time.


Ralph.

Published by: user13024707 on February 5, 2011 08:44

Maybe it's too late but here goes...

ASM disk group can have volumes that differ in size.
Add new volumes to the existing disk group.
rebalance
lower old smaller volumes that you want to resize.
rebalance
old volume is now out of ASM and can be delt with at the level of the OS to make it what you want.

Repeat until all the old volumes have disappeared.

re - integrate the new volumes once they have been rebuilt.

All without interruption and ASM maintains all the data.

It works best if you have enough new larger volumes to take all the data on the old volumes where you can drop all the old volumes at the same time.

Tags: Oracle

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