I have a 13 node cluster that I want to increase ramsize (http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-admin-tasks-quotas.html) to use more ram per server.
The reason is I am rebalancing 4 nodes out( currently 17 in ) and those 4 had significantly less RAM than the rest.
I want to go from a 52G to 100G, this nodes have 141G of RAM.
First question is, how risky is it? will the memcached process just allocate the extra ram inmediately? or will restarts happen? Should I expect data issues or performance issues? How long does it take?
Second, is 100G a reasonable number on 141G servers?