migration from zimbra to scalix with imapsync

[fabio]

Hi to everybody,
I have migrated my mail server from Zimbra to Scalix and I have used imapsync to transfer the mail; nevertheless I have noticed that the space occupied by the e-mails on scalix is very greater than the precedent (around the double one).
Is this normal?
What's the cause of this? How can it be resolved?

Thanks for the attention.

Fabio

[kanderson]

I'll make an educated guess. This won't necessarily be 100% correct.

When a message is receive by Scalix, it is stored in the message store and each recipient is given something similar to a symlink to it. This means that if a message with a 10 meg attachment was sent to 5 users, it would take 10 megs of data in the message store. This is obviously very space efficient, and I would assume Zimbra does something similar.

During your migration, it pulls out a message for each user, and migrates it to the Scalix server. That migration will not be aware of other copies, so if I continue with the previous example, each user will pull a 10 meg message from Zimbra, and push it into Scalix. Since Scalix is NOT looking for a duplicate of the message, this will result in Scalix showing a message store using 50 megs of space, where Zimbra had used only 10. If the message had initially been delivered to Scalix, it also would have used only 10 megs. So the issue is a temporary one related to the migration. Over time your Scalix box will become more efficient, as those 5 users delete their old messages, and they are replaced with new ones.

Hope that helps.
Kev.

[fabio]

Hi Kev,
thanks for the prompt answer, but it is not my case Zimbra it doesn't use this type of system mail archiving, besides the historical mail must have maintained on the system; insofar I would like that it didn't occupy excessive space.
I have not put the new system in production yet, therefore I search another efficient way to migrate mail accounts.

Thanks still for the help.

Fabio