atom feed15 messages in net.sourceforge.lists.courier-users[courier-users] Re: Multi-site theory...
FromSent OnAttachments
Sander Holthaus - Orange XLAug 22, 2004 11:11 am 
Sam VarshavchikAug 22, 2004 12:07 pm 
Sander Holthaus - Orange XLAug 22, 2004 12:37 pm 
Robert PfisterAug 22, 2004 8:55 pm 
Jerry AmundsonAug 26, 2004 9:03 am 
Ben KennedyAug 26, 2004 2:08 pm 
Sam VarshavchikAug 26, 2004 3:45 pm 
Georg LutzAug 26, 2004 3:48 pm 
Ben KennedyAug 26, 2004 4:31 pm 
Jacob S. BarrettAug 27, 2004 10:38 am 
Jerry AmundsonAug 27, 2004 11:18 am 
Sam VarshavchikAug 27, 2004 3:36 pm 
Jerry AmundsonAug 28, 2004 8:14 am 
Jerry AmundsonAug 28, 2004 9:37 am 
Ben KennedyAug 30, 2004 7:03 am 
Subject:[courier-users] Re: Multi-site theory (sort of long)
From:Sam Varshavchik (mrs@courier-mta.com)
Date:Aug 26, 2004 3:45:12 pm
List:net.sourceforge.lists.courier-users

Jerry Amundson writes:

This way, if the Internet goes down at either site, only Internet e-mail at that site is affected, whereas, currently, Internet downtime creates many problems (of course).

Crazy? Perhaps, but rsync'ing shouldn't cause any problems because of the unique file names, and it's --delete option should preserve the Maildir structure across to the "mirror" server, right? Our main office only has about 100 employee's, so the T1 bandwidth should suffice...

If one of the lines goes down and everyone switches over to using the rsync-ed mailboxes on the other server, then when service is restored the first rsync will obliterate any changes made to the rsync-ed copies of the mailboxes.

For purposes of providing backup access to mailboxes only, maybe you should install a cheap cablemodem in each office. Something that takes out a telco T1 is not likely to affect the cablemodem plant. Even with limited upstream bandwidth via cable, it should be sufficient for a dozen or so concurrent users. Furthermore, you can expect a T1 outage to be usually resolved fairly quickly, so you only need to bear with it for a little while.

Alternative wireless Internet may also be available in some areas.

Or, it's possible that a fractional T1 between the two offices may be cheaper than a pair of backup low-bandwidth circuits. Except that a backhoe incident in the immediate neighborhood will likely take out both circuits.