Recommend how to move 31GB of mail to a new server

[Ulrich Spoerlein]

On Sat, 23.06.2007 at 22:34:33 -0300, Patrick Boutilier wrote:
> Daniel O'Connor wrote:
> > On Sunday 24 June 2007 07:37, Gary Mills wrote:
> >> For only 30 gigabytes, you might be better off just copying the files
> >> over, with IMAP down.  It could only take a few hours.  You can copy
> >> a sample from the live system to get an idea of the timing.
> > 
> > You could rsync the mail spool while it is live, take it down and then 
> > rsync again.
> > 
> > That should save considerable time as I would imagine the vast majority 
> > of email would be unchanged between the first & second copy.
> 
> But unfortunately rsync will still have to scan each file to determine 
> what has changed, and that can chew up a lot of time.

Better than to speculate is to measure.
Time the rsync of the mailboxes to your new server. *Don't* shutdown
cyrus, but rsync right again. Measure the second run, too. This will
roughly be your expected downtime. I would be surprised if it is more
than 5-10 minutes.

You could also do: rsync (long time), rsync (short time), shutdown
cyrus, rsync (even shorter time).

hth
Ulrich Spoerlein
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