LaserSoft wrote:I would look at the roadmap for OCFS before making that statement. (It does not appear that it is going to be supported much longer in favor of ACFS. Having used both, I would dump OCFS at the earliest possible timeframe again, in favor of ACFS. AFGS in 11gR2 has been specifically optimized for shared Oracle Homes. The downside to using a SHARED ORACLE_HOME is that you lose the ability to do a "rolling" upgrade/patching. Rolling upgrade means: take down node 1 (everything fails to other nodes) patch it, restart it move to the next node. There is a reason RAC is considered HIGHLY AVAILABLE. Having to take everything down to do patching/upgrading defeats that purpose.
4. Which is better to use: ASM Cluster File System or Oracle Cluster File System ?
---> We Cannot compare like that. Becuase Oracle Automatic Storage Management Cluster File System (Oracle ACFS) extends Oracle Automatic Storage Management technology to support of all of your application data in both single host and cluster configurations.
you can use OCFS for shared oracle home data files & one might want to use ASM for datafiles and OCFS for shared oracle home.
977623 wrote:Wrong question IMO. You do not choose normal or high redundancy based on which rebalances the fastest. You make that choice wrt to redundancy and high availability.
1. Which type of ASM is better for the rebalancing perspective (and obviously the performance perspective), but considering the availability as well: Unprotected, 2-way (normal) or 3-way (high)? I know 3-way is the worst because we have to multiply by 3 the space of the database, but has great availability. Which of these do you use in your company?
2. If someone is using EMC/Fujitsu/Hitachi, do you use Unprotected or 2-way (normal) in ASM?That again depends on redundancy levels. If the SAN provides a RAID5 or RAID10 LUN, should you mirror it?
3. Which type of rebalancing (from zero to 11) is the best to use, considering the overall performance , I mean, when you have to add a new disk, ASm will perform the rebalancing.How busy is the I/O layer? What production processing is running? How will this be impacted by using power 11? How soon does the old (dropped) disks need to be physically decommissioned? Etc.
4. Which is better to use: ASM Cluster File System or Oracle Cluster File System ?For what purpose?