On 10/18/11 7:15 AM, Jake Vickers wrote:
On 10/17/2011 10:43 PM, Casey wrote:
One of my goals was to eventually setup some form of replication
(ideally it would be offsite, so if our main location ever went down we
could keep things going at the secondary). I've watched Jake's
"Replicated QMT" videos, and I'm watching the "QMT ISP Array" series
now. I'm trying to do a better job planning this one out, and wanted to
get some recommendations from other out there. Anyone else doing
replication? Say I setup a replicated toaster like Jake does in
"Replicated QMT"...how difficult, if even possible would it be to
convert that into something more like the "QMT ISP Array" setup down the
road?
The ISP array will have essentially the mailstore in common - each
server, for the most part, acts independently, only storing the mail
in a shared location. With the exception of the DB replication, the
rest should be easy to migrate to with almost no impact to your
clients - as you add a new server, just change the DNS record. After a
few days for DNS propagation, users will be using the new server added.
The QMT download mirrors work a lot like that, using DNS roundrobin.
As someone donates a mirror, I just add it to the A record. DNS
handles the load balancing between the mirrors for me. Not as tunable
or flexible as a $80K load balancer, but it does work :)
Nice! I'm sure I'll get more of my questions answered when I finish
watching your videos...I'm just starting the 3rd of 8 I believe. Ok, so
take this scenario for example:
If we get everything migrated onto our QMT box "Q2", how can I begin to
transform that into a back-end server? Doesn't sound too difficult if
you are working with 2 fresh installs, but what if you have an existing
production server? Can it be done?
Thanks!
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