migration and seen flag

[Ron Vachiyer]

> Seen data is only stored in .seen files for shared or other user
> mailboxes.  The seen data for the mailbox owner is stored in the
> cyrus.index.  This has two benefits:
> 
> 1) lower IO for the most common case.  We need to update the
>    cyrus.index file anyway to record the new MODSEQ.
> 2) owner seen becomes shared seen if you switch to shared seen
>    mode on the mailbox, so that you don't wind up with one huge
>    file full of shared seen data if you have a lot of shared
>    mailboxes.
> 
> Seen files were actually a lot of extra IO on 2.3, small files
> with multiple fsyncs!
> 
> Bron.

Hello,

I am beginning to see this.  Is there a mecanism to read from these .seen files to recover this data during a migration?  Because from what I am seeing, if I move a .seen file from the old server, the new server never reads from it and all my seen data is lost.

Thanks in advance,

Ron.

 		 	   		  
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