RAC and ASM disk layout

Hi!

We are new to RAC and are discovering serveral uncertainties regarding the best disk layout to use for ASM. We are running two EMC Clariion systems (under RAID-5) and want ASM to write to both Clariions simultaneously (i.e. use normal redundancy). ASM will balance the load across the two failover groups (i.e. two LUNs) which reside in two EMC Clariion arrays.

The question is, whether it is better to use a single LUN with 100 GB or have a number of smaller LUNs (totalling 100 GB). Since we are using a single raid group (i.e. 5 disks) for all database storage, all LUNs will end up on the same physical devices anyway. So it might be harmful having ASM to try and balance I/O across several LUNs which all reside on the same physical devices.

This is 10.2 on HP-UX 11.23.

Thanks,
Helmut

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