Upgrade 5.0.11 NE to 6.0.6 NE Cluster

[Hatrix]

Hy guys,

I have a 5.0.11 NE Editition with approx. 1500 users.

We want to upgrade to 6.0.6 but i am challenged by the migration to a cluster as well, anybode done something like this?

I am not sure if I can do the following:

**
* Upgrade the server to 6.0.6
Make a full backup
Install a new cluster setup with 6.0.6
Restore the ldap, mysql and mailstore to the new cluster-partitions?

will this work? does the zimbra cluster setup anything special to the ldap, which would make the ldap-restore useless?

or

**
* Can I upgrade to 6.0.6, and in the same process upgrade to a cluster?
After reading the manuals I do not really think so ...

or

**
* Create first the 6.0.6 cluster fresh, then make a zimbra2zimbra transfer from the old machine?
I guess this approach would be nice, but i also guess it will take more time, I need more space on the filer, I have to deal with users working on the old machine whilst the transfered once need access on the new machine (difficult with 1500 users) ...
Is such a migration of 1500 users done in a reasonable amount of time (could it be done on a weekend?).
Is it possible to make Zimbra2Zimbra transfer from 5.0.11 NE to 6.0.6 NE?


Any Advice, best Idea?

thx
Ray