sync_client bails out after 3 MAILBOXES need upgrading to USER in one run

Wesley Craig wes at
Tue Sep 12 18:00:13 EDT 2006

On 12 Sep 2006, at 16:51, Kjetil Torgrim Homme wrote:
> interesting.  is one of the replicas off-site?  you don't worry about
> EMP or stuff like that?  for how long do you keep the expunged  
> messages?
> I think turning off tape backup would be a very tough sell around
> here...

In our test runs, restoring our data (12 TB and growing) from TSM  
would take 6-8 weeks.  To get a reasonable restore time from our  
(YMMV) TSM installation for Cyrus IMAP for disaster recovery purposes  
is cost prohibitive -- more expensive that our entire IMAP  
installation.  It works fine for user-error, tho.

replicas are off site.  We're keeping unexpunged messages for one  
week, which is per University policy.  Our centrally run backup  
service is a rather old TSM installation.  It needs to be upgraded.   
The cost difference between upgrading TSM and duplicating our IMAP  
infrastructure was strongly in favor of duplicating IMAP.  As an  
added benefit, in the event of a more-likely disaster (fire / flood /  
power problem in our data center, all of which we've experienced in  
the last 10 years), the duplicate IMAP installation could be  
immediately put into production.  Our AFS installation is also moving  
to disk-only backups.

Personally, if UMich experienced a disaster involving EMP or other  
TEOTWAWKI scenarios, I suspect that losing archived email would be  
the least of our worries.  I haven't heard that from UMich disaster  
planners, tho.


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