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kenf

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We are currently running Kerio Connect 7.1.4 patch 1 build 3411. We had a power outage and were unable to access our email. Is there a way to setup a second server that can be replicated from the first? If the first server goes down, the second server will be accessible. Would the "Distributed Domains" feature work for this?
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tonyswu

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Unfortunately, Kerio doesn't have any cluster functionality. I use Mac server for Kerio, and the closet thing I can come to a cluster is to have two computers, 1 running, another in target disk mode connected to the first one with a firewire cable. Use Carbon Copy Cloner to clone the server in a regular basis, and if the running server goes down, you can fire up the second one within minimum down time.
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unityweb

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We use rsync to sync the /opt folder. Works fine.
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TCMMac

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Is Rsync or CCC a better solution? I take it Distributed Domains does not solve the issue.

I ask because we are about to do the same thing, and need a redundant (Mac) Connect server.
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tonyswu

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We use CCC, which I believe uses rsync.
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sfpete

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How often are you running the clone? This seems pivotal. Do you run it every day? hour? 5 mins?

In the event that you had to revert to the clone, what is the impact of the difference between the master and the clone on the connected email clients that may be more up to date than the server clone? I'm just _guessing_ they'll sync back in time? Or freak out.

And, are you using the network "Remote Macintosh" function in Carbon copy cloner?

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tonyswu

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We run the clone every 3 hours.

In the event that we had to revert to the clone, we would lose at worst 3 hours worth of emails. If the master is later recovered, you should be able to just sync them again and preserve the newer files. We've not had to do this yet, so I guess I should probably go fail my server purposely and try out my recovery process.

No, we don't sync to a remote Mac. The secondary mac mini is connected to the primary in target disk mode over firewire. We have switched power strip, so if the primary fails, we turn off power on the primary server, and cycle the secondary server so it boots up normally.
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yukiomishima

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why not try the following (not my solution... but one i found when looking at creating an RAIS using the mac-mini... so i can't take any credit for it)... as you are 3/4 the way there.... and this gives you 100% "live" redundancy

http://www.precursor.ca/rais/

i am not running it this way at the moment... but plan to do so when we migrate our servers over within the next few weeks

yukioMishima

[Updated on: Mon, 22 October 2012 13:07]

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MacLab

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nice idea. Too bad you can't pull the cable remotely. But not bad!

MacLab, Inc.
Kerio Certified Partner, Reseller, Hosting Provider, Kerio Connect Certified.
http://maclaboratory.com
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andrewrob

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Has anyone using CCC had problems with corrupt mailboxes etc? I want to set up a quicker backup than the 48 hours it takes to do a full backup for me at the moment. CCC seems like a good option.
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sfpete

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And Regarding the RAIS idea...

Isn't there a concern with leaving the mini in target disk mode with it's uncontrolled fans running full-bore 24 hours a day?
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tonyswu

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The RAIS idea is pretty much the same as my solution. Difference is I sync my system drive once a week, and RAIS is raided. You still need to shut down the primary server and bring up the secondary if something goes wrong. If you have a switched PDU, you can remotely turn off power on the primary, and cycle power on the secondary. Then your primary will power down, and secondary should boot normally. This is nice if your server is sitting in the datacenter.
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tonyswu

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sfpete wrote on Fri, 26 October 2012 08:55

And Regarding the RAIS idea...

Isn't there a concern with leaving the mini in target disk mode with it's uncontrolled fans running full-bore 24 hours a day?


I am not sure if fan spins in full power while in TDM. Legitimate concern though, I should look it up.
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tonyswu

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andrewrob wrote on Fri, 26 October 2012 07:25
Has anyone using CCC had problems with corrupt mailboxes etc? I want to set up a quicker backup than the 48 hours it takes to do a full backup for me at the moment. CCC seems like a good option.


I have not had problems with CCC corrupting indexes.
tonyswu

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MacLab wrote on Thu, 25 October 2012 18:02
nice idea. Too bad you can't pull the cable remotely. But not bad!



With a switched power distribution unit, you can remotely shutdown the primary and cycle the secondary, basically the same as pulling the cable.
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