Hi All, I'm looking to set up a durable HA broker and had a few questions. First off, sorry if these questions are more appropriate on a Linux-HA forum... just trying to see if other people have come across the same issues.
After setting up a two node cluster and being quite happy with the ease of config - I realised that I would have to solve the split-brain problem. So, using 3 virtual machines, I followed the guide @ https://cwiki.apache.org/confluence/display/qpid/Configuring+qpidd+with+Cluster+Manager which works reasonable well - (I've had a few issues with rgmanager hanging occasionally during failover... but I digress...) The environment that I'm using at the moment is on a bunch of Linux KVM's, but it will eventually be moved to physical infrastructure. I have some reasonable performance requirements and the hardware I'm using is quite expensive - so adding another node for HA just to maintain a quorum seems "wasteful". So, I'm investigating if a 2 node setup is possible. Is it possible to do HA with two nodes (without a "real" qdisk)? I've tried adding a 3rd node (a cheap virtual machine) for quorum only - I.e. it doesn't run qpidd and is only used for quorum. It seems to work - although I haven't thoroughly tested all failure scenarios yet. Other idea's I've had are - Using Qdisk heuristics to generate more votes - everything I read seems to suggest not to do this... - Integrating with a load balancer (there's an existing LVS cluster on the same network - that I can piggy-back on) to protect against split-brain "somehow" :) - Leave it as a two node cluster and rely on corosync totem protocol, or interface bonding for fault tolerance. Then, if a split brain does occur, it's pretty certain (about 99.9% :) that clients wouldn't be able to access the cluster anyway. A couple of questions... Do cluster messages require acknowledgement from cluster nodes before sending ack's back to the client (if the clients require acknowledgement)? And hence, does adding more nodes degrade performance? Has anyone ever tried running qpid over something like drbd? Is it possible to specify a bind address for qpidd? Look forward to any replies/guidance/commentary Thanks, /gav --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@qpid.apache.org For additional commands, e-mail: users-h...@qpid.apache.org
