[Oracleasm-users] Shifting from OCFS2 to ASM

[Karim Alkhayer]

Hello All,

 

We're considering ASM with Oracle Clusterware 10.2.0.4 as a replacement to
OCFS2 in order to maintain a more reliable RAC. We've been hitting stability
issues with our 2 node RAC running IA64 SLES9 SP3 and Oracle 10.1 and OCFS2
1.2.1 - As the upgrade options are limited, ASM seems to be a better
alternative and been recommended by Oracle support as well.

 

I've got a couple of questions and would appreciate your thoughts:

 

1.     The primary RAC is hosting 5 databases with around 500 GB divided
into a few disk groups with RAID 6 hosted in two SANs; these disk groups are
composed of disks of 36GB with 15K RPM and 146GB with 10K RPM. I'd like to
know if we need to break the RAID6. If so, what is the best recommended RAID
type? 

2.     We've got consistent shared LUN listing across the cluster, an
example is /dev/mapper/2003013840ad20008 (we're using this method to create
and mount OCFS2 volumes); is it possible to maintain the same way of
discovery? There is a note in "Configuring Oracle ASMLib on Multipath Disks"
saying that dm prefix must be used for the scan order and exclude. Do we
still need ASMLib, and can we use the device mapper instead of dm prefix?

 

Thanks, and looking forward to hearing from you

 

Best regards,

Karim Alkhayer

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