On Fri, 2011-06-03 at 10:56 -0500, Ian Foutch wrote: > I have been trying to find information and possible issues with > running a cluster of dovecot server with different versions without > any luck. > > We have an existing cluster with dovecot v1.1.10 and tried migrating > to a new cluster with dovecot v2.0.12. We ran into some issues when > we moved traffic to the new cluster and have been unable to reproduce > it in our own testing. We may need to put real usage on the new > servers but would like to be able to do this by adding newer servers > into the existing cluster. > > What are the potential issues with doing this?
Are they sharing mail files? It's similar to upgrading/downgrading then: v2.0 can read index files created by v1.1, but once v2.0 has done changes it's not a good idea for v1.1 to try to read the indexes anymore. Another possibility would have been to do this more gradually: First upgrade to v1.2.17. There are no problems with v1.1.10 reading its index files. After this upgrade to v2.0. v1.2.17 has no problems reading v2.0's index files.
