Enabling ASM fast resync - backout considerations.

Hi,
I've just completed some testing in a sandpit environment of the ASM fast resync functionality. This was done by ensuring all databases using by the ASM instance had their 'compatible' setting at 11.1 and then altering the compatible.asm and compatible.rdbms parameters for each of the ASM groups. eg
ALTER DISKGROUP TESTDATA SET ATTRIBUTE 'compatible.asm' = '11.1';
ALTER DISKGROUP TESTFRA SET ATTRIBUTE 'compatible.rdbms' = '11.1';
All seemed to work ok, and during a test, in which I chmodded a candidate disk, asm took it offline, and then the countdown timers started , after which I fixed the problem, brought it online, and ASM performed the fast resync.
I'm about to roll this change out to our dev cluster, and wondered if anybody had any ideas for a backout plan, or if there were any potential problems that I might come across that would necessitate a back out. It seems that when you make this change, it cannot be undone, so I want to make sure I don't get any nasty surprises.
Thanks

Hi,
unfortunately this parameter can only be increased (not decreased), so the only fallback method is a restore. So make sure you have actual RMAN backups.
Because you need to recreate the diskgroups and to the restore the databases...
Before activating it, make sure you don't run any 10g databases on these diskgroups!
However I don't know of any issues (expect still having 10g databases) which would require a "downgrade" ....
Regards
Sebastian

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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
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Hello
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*omit
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*omit
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*omit
Product : Cat3750X
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Best Regards,
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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
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