ASM best configuration disks on EMC storage in RAC
511874Feb 4 2008 — edited May 8 2008After reading ASM best practices, suggesting to use a disk group for all datafiles and a disk group for FRA I was wondering how to optimize I/O on storage.
I mean.. what about if I add also a disk group for the redologs of the two RAC instances?
Moreover... what are the best practices to use the several disks offered by the storage compared with the possibility to use different LUN on the same big disk of of the storage?
Example...
My storage has 2 disks of about 2TB each one:
1) I could partition one disk into two LUN and use this two LUN for the DG_DATA and DG_FRA asm disk groups. Every LUN should be partitioned in small units.
2) I could use two disks and use one disk for DG_DATA asm disk group and the other for DG_FRA asm disk group.
3) I could use two disk partitioned in two LUN (and so I have 4 LUN). Add to the DG_DATA disk group the LUN partitions physically based on two different disks, and the others two LUN for the DG_FRA disk group.
Hope you can solve my doubts,
thanks Marco