Re: RAC - mix Intel and AMD in same cluster ?

From: K Gopalakrishnan <kaygopal_at_gmail.com>
Date: Wed, 29 Jul 2009 10:51:29 -0700
Message-ID: <3b0f44a10907291051m674c8a45qe668993a005205b9_at_mail.gmail.com>

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.

--

http://www.freelists.org/webpage/oracle-l Received on Wed Jul 29 2009 - 12:51:29 CDT

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