Best practice RAC installation in two datacenter zones?
Datacenter has two separate zones.
In each zone we have one storage system and one rac node.
We will install RAC 11gR2 with ASM.
For data we want to use diskgroup +DATA, normal redundancy mirrored to both storage systems.
For CRS+Voting we want to use diskgroup +CRS, normal redundancy.
But for CRS+Voting diskgroup with normal redundancy we need 3 luns and we have only 2 storage systems.
I believe the third lun is needed to avoid split brain situations.
If we put two luns to storage #1 and one lun to storage #2, what will happen when storage #1 faills - this means that two of three disks for diskgroup +CRS are unaccessible?
What will happen, when all equipment in zone #1 fails?
Is human intervention required: at failure time, when zone#1 is coming up again?
Is there a best practice for a 2-zone 2-storage rac configuration?
Joachim