In last blog we already talking about Migrate Zimbra from 32bit to 64bit , however Zmmailbox is quite slow when export and import when you have greate many mailboxes. Each mailbox will cost 5 second, so when you have for example more than 10000 account, that would be a disaster. In Zimbra official documentation, it also mentioned, when migrate 30GB data, will cost 5 days and night.
There would be a few ways to accelerate the speed, but it always be a good idea to find out how many data you are facing. The empty mailbox you wont need to migrate mailbox. That’s why we can create a script to find out the list of non-empty mailbox account.
Trying to migrate 32bit Zimbra Mailbox to 64bit Zimbra. You can migrate LDAP data first which including all the accounts and then migrate Mailbox which including messages, calendars … etc
I assume you using the same version of Zimbra with both 32 bit and 64 bit. But it should be able to work for all version > 6.0
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