we actually have two Zimbra servers running Mac OS X Server 10.5.8 with ZCS 5.0.22 but we are planning to migrate to Vmware ESXi 4.1 with Ubuntu 10.04_LTS 64 bit as the guest OS.
FYI, we have 3500 users; a server is the primary_ldap/primary_mta-antispam/logger while the other is the mailbox/backup_mta-antispam/backup_ldap; all incoming messages from other domains are filtered for viruses and spam by two clustered Sophos appliances before going to the ZCS servers.
I have read the 32 to 64 bit migration guides in the Zimbra wiki and searched though the forums, but could not find a valid solution to my problem.
On Moving ZCS to New Server - Zimbra :: Wiki and Network Edition: Moving from 32-bit to 64-bit Server - Zimbra :: Wiki I see that:
I thought that we could migrate our Mac servers installation from ZCS 5 to ZCS 6, then migrate ZCS 6 to a new Ubuntu 10.04 server and finally upgrade it to ZCS 7.1, but so far I see that the latest ZCS release for Mac OS X 10.5 is 6.0.7 while the first available release for Ubuntu 10.04 is 6.0.8 ... no common ZCS version between the old and new OSes.IMPORTANT: The ZCS release you install on the 64-bit server must be the same release as installed on the 32-bit server. The server can have a different operating system.
Could we ignore the warning and follow this migration path:
or we will end up with a messed up, non working mail server?
- on the old Mac OS 10.5 servers:
- upgrade ZCS 5.0.22 > ZCS 6.0.7
- apply zcs-patch-6.0.7_GA_2476
- on the new Ubuntu 10.04 servers:
- clean install of ZCS 6.0.8
- apply zcs-patch-6.0.8_GA_2685
- copy the existing data from ZCS 6.0.7_Mac to ZCS 6.0.8_Ubuntu
- upgrade ZCS 6.0.8 > ZCS 7.1.0