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Don Burleson Blog 







Archived Redo Logs on Shared ASM Storage 

Expert Oracle Database Tips by Donald BurlesonNovember 24, 2015

Question:  I have EMC disks using ASM shared storage.  I want to set-up archivelog mode in RAC, but I don't know if it is wise to use ASM because it used Stripe-and-mirror-everywhere, with disk file striping.  Does it make sense to place archivelog on ASM (shared storage)?

Answer:  ASM uses RAID-10, striping and mirroring, not good for archive redo logs.  Plus, Oracle's OFA standard suggests that the archive redo logs be duplexed on two separate disk spindles.

Remember, you NEED archive logs to roll-forward, and because ASM stripes the files across multiple disk platters, a disk failure would make it impossible to recover.

 Also, all DML (insert, update delete) write to the archivelog file, so you need it on a separate disk to prevent disk I/O bottlenecks.  

Instead, Oracle recommends duplexing your redo logs on two separate, dedicated disk spindles.  

Use EMC Symmetrics (or have EMC support) set-up two plain disks for your archive redo logs, one for each RAC node.  

Also, see these related pages.


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