Re: RAC - mix Intel and AMD in same cluster ?
- From: K Gopalakrishnan <kaygopal@xxxxxxxxx>
- To: john.kanagaraj@xxxxxxxxx
- Date: Wed, 29 Jul 2009 10:51:29 -0700
John,
You are correct. The issue is not just DML locking, it is the distribution
of GC resources across the cluster members. Everything is global in RAC
environment and If there is a non responsive member (or slow responsive
member) in the cluster, it will affect the performacne of the entire
cluster.
During startup or reconfiguration (node joining/leaving) the resources are
equally distributed. However you can control the behavior with some
underscore parameters (like _lm_master_weight or _lm_ress,etc). If there is
a lazy member in the cluster and if you don't want him to own any resources,
you can disable the lock mastering for that member by setting _lm_ress to 0
for that member. It is like going back to old OPS days where we control the
lock management, and most of them are not supported in RAC environment.
-Gopal
BTW RAC is more simpler than it looks for the end users.
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