On Sun, Jun 24, 2007 at 10:50:28AM +0200, Ulrich Spoerlein wrote: > 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). I did this a couple of years ago with some 250GB mail. Machines physically close, so good connectivity, but 250GB still takes forever. I ran rsync over a few nights, just killing it at 8am. This got us close to where we wanted to be, then on a Saturday I took everything down and ran a final rsync that, IIRC, took about 1/2 hour; switched cyrus/mail/... on the new server on and voila - migration completed. -- Alain Williams Linux Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer. +44 (0) 787 668 0256 http://www.phcomp.co.uk/ Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php #include <std_disclaimer.h> ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
