Koozali.org: home of the SME Server

Legacy Forums => General Discussion (Legacy) => Topic started by: miguelalbore on June 24, 2005, 07:29:50 PM

Title: Two SME Sever's??
Post by: miguelalbore on June 24, 2005, 07:29:50 PM

is it possible that you can syncronize two SME server's and both working for one only domain. I mean, when one server is down the another server get the email of my site.

Thanks,
Miguel!

Title: Two SME Sever's??
Post by: Boris on June 24, 2005, 08:13:17 PM

If its just for e-mail, you could set up two servers for the same (e-mail) domain and assign MX records for them with different priority. One will become your primary e-mail server, other will be secondary (backup mail server).
If you need more fault tolerance then e-mail backup, check high-availability project for older version of SME and see if it can be fit to your version.

Title: :)
Post by: miguelalbore on June 24, 2005, 08:44:21 PM

Thanks for your anwser,

This is a good solution for external service. But i have a question for internal service.

If i use two email servers and i configure this with DNS high priority one of them, in case that my first server fail and the second get emails, everything was ok. But when the first is up again then i can think that i lost emails because when my user final check its email, Outlook always check the email server that have higher priority then Outlook never download the emails that arrived to the second server.

There's a way to the SME second server forward to the first server SME Server the emails that it received when the firts server was down??.

What about ETRN o "multi-drop" option?

Thanks,
Miguel!

Title: Two SME Sever's??
Post by: gardnc on June 25, 2005, 10:21:24 PM

>If i use two email servers and i configure this with DNS high priority one of them, in case that my first server fail and the second get emails, everything was ok. But when the first is up again then i can think that i lost emails because when my user final check its email, Outlook always check the email server that have higher priority then Outlook never download the emails that arrived to the second server. <

May not be the best solution, but we solved it by having each mail client check and get email from both mail servers.

Title: Two SME Sever's??
Post by: Boris on June 27, 2005, 11:31:30 PM

If secondary server is configured to use first as internal mail server, it will accept e-mails and try to forward them to the first server. If primary server is temporary is not available , secondary will retry for (i belive four days?) before gives up. When master server comes back online within this period, e-mail will be forwarded to it.

Title: Two SME Sever's??
Post by: miguelalbore on June 28, 2005, 12:10:20 AM

<<If secondary server is configured to use first as internal mail server>>

How do you make this?

Title: Two SME Sever's??
Post by: Boris on June 28, 2005, 08:40:41 PM

by using "Delegate mail servers" to internal server in server-manager

Title: Two SME Sever's??
Post by: miguelalbore on June 28, 2005, 10:14:57 PM

It's interesting =). But i have another question.

Both servers have to have the same number of users? Or the secondary server what special conditions have to have?

I mean in the first server i have an user, and the secondary server this user has to exist also? or the secondary server has to be "clean installation"?

Thanks for your time

Title: Two SME Sever's??
Post by: miguelalbore on June 30, 2005, 08:34:01 PM

I was doing test of this. It seems the best option was when i made and "clean installation "

The  only problem is the server smtp that it waits until the primary server is up for sending email.

Another solution for sending mail when the primary server is down?

Miguel!

Title: Two SME Sever's??
Post by: Boris on June 30, 2005, 09:05:01 PM

>> Another solution for sending mail when the primary server is down?
I don't see the solution on this level. Bigger networks ISP may use dynamic routing, failover, clusters etc... for redundancy, but it is expensive solutions. Talk to your ISP about e-mail backup option, they may offer you some solution. Many ISP do.