I just moved our Zimbra install from Centos 5 32-bit to Ubuntu 6 LTS 64, following these instructions, Network Edition: Moving from 32-bit to 64-bit Server - Zimbra :: Wiki
and this thread as a guide, Problem With Moving ZCS to New Server
Everything went OK and the server is up and running. Simply fantastic.
There were only two extra things I had to do:
1. SSH keys for the Zimbra user had to be re-generated, I was experiencing this problem Can't access server details
2. I also ran the /opt/zimbra/libexec/zmfixperms (as root) script to update permissions after moving the data directories and before starting the Zimbra server for the first time (step 8 in the wiki).
Question 1: I noticed that the zimbra.log now contains a LOT SLAPD debug messages which makes it pretty hard to read the logs. I don't know if this is a Ubuntu option or Zimbra 5.06. Does anyone know how to reduce the log level for SLAPD?
Question 2: The Wiki page, Network Edition: Moving from 32-bit to 64-bit Server - Zimbra :: Wiki states that it is safe to delete /opt/zimbra/backup/*. This has GREATLY reduced the size of the installation, we've been using Zimbra since R3. Looking into that directory I can see a lot of 'upgrade' backups which seem redundant. Should it be a regular administrative task to delete this directory and perform a full backup? Thereby clearing out all the old backup data.
Thanks for the great documentation which made life much easier and the whole process much faster.