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ffuchs

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hi,

we want to replace our mac os x 10.6 server with a new mac mini and os x 10.8-server. but for email/addressbook/calendar we want to use kerio.

because of no "real" server (no 2 power supplies, no server grade harddisks,...) and our simple xdsl-connection we made a setup, that mac os x 10.6-server pull via POP with fetchmail from our provider, who host every mail-account from us. on our workstations we setup a connection to the imap-service of our mac os x server.

the idea behind: if our mac os x server has technically difficulties and is not reachable - we don't lose emails, because new emails wait at our provider until our os x server fetches them again.

I looked at the manual of kerio and I can't find such a feature, so I would like to ask, what are the best ways with a kerio-mailserver to don't lose emails, if there is a hardware problem with the mac mini or with our internet connection.

thx! regards, ferdinand
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fishtech

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Hi,

SMTP servers should be configured to retry sending to you for a period 4-5 days in case you have a problem.

http://www.ietf.org/rfc/rfc2821.txt

In our Kerio Connect setup we use a Mac Mini, but the boot disk and mailstore are on an external Pegasus thunderbolt RAID.

We keep a second Mac Mini on hand in case of problems with the primary mail server hardware.

If there is a problem with the mailserver hardware, I would hope we would be able to switch the Pegasus RAID to the new hardware within the 4-5 day retry period without losing any mail.

Regards,

ft.
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tonyswu

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Here is the solution closest to true redundancy that I've come up with. What you'll need:

1. 2 Mac Mini. Ideally with 2 hard drives in them, mirrored.
2. 2 storage. Kerio Connect performance largely depends on drive speed, so this needs to be fast. Promise R6 with RAID 10 is good, or you can even go higher end and use the V-Trak.
3. IP switched power strip

Here is the setup:
1. Primary Mac Mini stays up and running, secondary Mac Mini in target disk mode
2. Connect both Mac Mini and 2 storage RAIDs together using either FireWire or Thunderbolt
3. Keep system files on Mac Mini, mail storage on RAID.
4. Weekly clone from primary Mac Mini to target disk mode secondary Mac Mini.
5. Clone (rsync) mail store from primary RAID to secondary RAID every 3 hours.

If the primary Mac Mini goes down, you would login to your IP switch power strip. Turn off power for primary Mac Mini so it shuts down, cycle power on the secondary Mac Mini so it boots up normally.

If the primary RAID goes down, you would shut down Kerio Connect, rename your secondary RAID volume name to match primary RAID volume name (like Data Clone to Data), restart Kerio Connect. You will lose the emails since the last sync, but if you need it back up ASAP this is what you'll get.

Of course, this assumes even if the RAID fails the connection (firewire or Thunderbolt) still works. If it doesn't, then you'll have to drive down to your datacenter and re-wire.
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ffuchs

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hi fishtech & tonyswu,
thanks for your input!
regards, ferdinand
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