Herman wrote:
I made a change to IPTables, and did a "service iptables restart", and next thing I knew, I had a split brain.
Are you sure it was a split-brain on DRBD level, or perhaps OCFS2 "freaked" out and nodes started fencing each other?
Default OCFS2 cluster rules have quite low timeout levels -- I used to have some problems with default settings even in active/standby mode.
'service o2cb status' should be able to tell you timeouts etc. If it's going to be 2000ms, I would raise it to something around 10000ms and try reloading firewall then.
I have DRBD running on few nodes and reloading firewall, although I am using filtergen -- so 'fgadm reload' -- never caused any issues with neither DRBD nor OCFS2.
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