Ok. Update - as you can see from the numbers below we are well, well into the migration. Had some issues initially with our load balanced MTAs. SpamAssassin is dog slow... Anyway, because we have spam wall protecting our mail servers, we turned antispam off.
We also decided to make a slight design change - instead of having a cluster of load balanced MTAs we decided to split the functionalitys of the MTAs. Half would perform relay functionality and the other half will performing inbound MX. This overcomes postix's problem of only having 1 queue.
Over 1/5 of our users have been migrated and we (at the moment) are not even requiring more than 1 MTA. OK, it does have 12Gb RAM and 8 Cores!
But we will be adding to them on Monday.
If anyone does considering using the external data source as a method of migrating mailbox data -
Quote:
|
zimbraScheduledTaskNumThreads
|
should be tuned to what is required.
zimbra_mail=# select count(*) from users;
count
--------
119160