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C-Mail C-DNS ... is this a HA Clustering?

Discussion in 'Plesk Expand 2.0 and Legacy General Discussion' started by knocx, Oct 1, 2006.

  1. knocx

    knocx Guest

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    we are considering several PLESK + Expand , but it is not clear what actually expand provides.

    i.e if we add 3 Centralized PLESK - Qmail instances to Expand what does expand do?

    Treat them a a single mail server? if so how is load balancing and sync provided?
     
  2. Sergey L

    Sergey L Golden Pleskian Staff Member

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    The centralized mail solution does not provide automated redundancy or load balancing.

    You can use a single Mail server for few Web servers. Or you can use 2 Mail servers - first mail server for one group of Web servers and second mail server for another group of web servers.
     
  3. knocx

    knocx Guest

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    thank you ... do you know if it is in the todo list?

    unfortunately without clustering exapand is not offering too much...

    what is the advantage of using a saparate mail server for each plesk server?

    we need some type of HA & parallel proccessing for 5 PLESK servers Qmail instances , we wish to merge 5 plesk servers in to 3 Qmail instances and a file server
     
  4. Sergey L

    Sergey L Golden Pleskian Staff Member

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    Yes, that's included in TODO list for 2007 year.

    What you consider being more important - redundancy or load balancing?

    Could you describe your vision of HA features in details?

    E.g. the cheapest solution is having 2 mail servers:
    1. real mail server (mailboxes)
    2. auxiliary mail server - redirecting whole mail traffic to real mail server.

    Both servers are registered in DNS (MX) and when 1st server is down, mail delivery is performed to 2nd one. 2nd server can not redirect mail to 1st one, but it can store incoming email in queue for about a week. When 1st server is up again, 2nd server starts delivering emails.

    This solution solves problem for sender (email is sent succesfully), but it does not help a receiver. He can not connect to maibox and see incoming email. Is it important for you? Are there any other aspects important for your business?
     
  5. knocx

    knocx Guest

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    hello;

    load balancing %60
    HA %40

    i.e we plan a setup

    2 Qmail instances with a file server

    Queue is shared between qmail instances on the file server this provides redundancy and parallel processing.

    Both servers are registered in DNS (MX) and when 1st server is down, mail delivery is performed to 2nd one


    ... yes its OK for HA

    but it can store incoming email in queue for about a week. When 1st server is up again, 2nd server starts delivering emails.

    ...nope it should continue stand alone

    icewarps (Merak) Clustering example is great it the means of HA and Performance however it is a windows product
     
  6. knocx

    knocx Guest

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    thus Qmail1 , Qmail2 , QMail3...etc get synced while they use a single que for processing
     
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