Re: Moving to RAC
- From: Dave Morgan <oracle@xxxxxxxxxxx>
- To: Oracle-L <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 04 Mar 2015 07:56:28 -0700
Date: Wed, 4 Mar 2015 09:56:28 +1100
From: Stojan Veselinovski <stojan.veselinovski@xxxxxxxxx>
Agree with Jeremy's sentiments.
The initial stages you are likely to get less fault tolerance due to
configuration, bugs, learnings etc, etc, RAC is not a magic HA bullet.
Make sure you properly design and architect for it.
I agree, I always figure 6 months to reach the previous SLA and another 6 months
"tuning" the cluster to get true HA.
I also believe a 2 node cluster provides very little benefit and a lot of costs.
If both nodes are running at 60% load and one fails, the other will bind up
very quickly.
4 or more for HA, less if separating application loads, 1 node per load
Make sure you test load and resilience eg. downing nics in bonded
interfaces or haip, node evictions, losing io channel, etc, etc
+eleventy-million. My favourite is pulling plugs in the data centre. Always
watch the face of the storage admin :)
Dave
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Dave Morgan
Senior Consultant, 1001111 Alberta Limited
dave.morgan@xxxxxxxxxxx
403 399 2442
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