keep cyrus in sync with cold standby

[Blake Hudson]

Marcus Schopen wrote the following on 10/16/2012 10:26 AM:
> Hi,
>
> I'm thinking about a strategy to keep my cyrus server (2.2.13 on Ubuntu
> 10.04 LTS) in sync with a cold standby server. This hasn't to be a
> live/hot sync and I'd like to keep it as simple as possible. A sync
> delay up to 30 minutes is acceptable for this small setup (250 Accounts,
> 80 GB mail storage, 5 emails per minute), but I don't want to stop cyrus
> while doing the snyc.
>
> Cyrus replication seems to be the most reasonable way, but I'm sitting
> on Ubuntu 10.04 LTS, which comes with cyrus 2.2.13 and I can't find any
> newer backports. Centos 6.x with Cyrus 2.3.16 could be an alternative
> setup, but I'm not sure if 2.3.16 is also to old for stable
> replication. :/
>
> DRBD could be an option but I never had DRBD running within a parallels
> virtualisation (bare metal setup); might be a timing/performance problem
> with a lot of very small files?
>
> Do I run in bad problems if I just run a simple rsync
> of /var/lib/cyrus, /var/spool/cyrus/ and /var/spool/sieve/ and dump
> mailboxes.db (skiplist) with "ctl_mboxlist -d" every 30 minutes? Is
> there a way give cyrus a flush of its databases without stopping it?
>
> Ciao
> Marcus
>
>
rsync will work. I've used it with good success. Replication might be 
less load as it negates some of the necessary checks inherent with rsync 
to determine if files have been modified.

--Blake