Sanjay,
There are ways to fix corrupt ASM disk headers (other than restoring a
backup of the header) so no, it is not true that all the data would be lost
if external redundancy disk header is lost.
However, this scenario is exactly why you would not use external redundancy
of you are unable to protect the disks and the headers at the storage layer.
There are scenarios where you would have separate disk groups for each
database but these would generally not be for protecting data, but
segregating it for purposes of using storage snapshots.
Seth Miller
On Tue, Feb 23, 2016 at 10:48 AM, Sanjay Mishra <dmarc-noreply@xxxxxxxxxxxxx
wrote:
Hi
Need some expert opinion on Oracle ASM best practices and high
availability. It is recommended to have minimum DG using ASM like DATA/FRA
for multiple database on the Cluster. Now I had seen some scenario, where
one disk header on External Redundancy DG causes to restore all Database
and hence Major failure. Does this not make sense to create multiple DG
like DATA for each Database and FRA can be shared ?
Please share your opinion and just for reference that Disk header in such
scenario was not recoverable from backup header.
TIA
Sanjay
