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Thread: Ram requirements for 5 User Zimbra Deployment with MTA external relay

  1. #1
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    Default Ram requirements for 5 User Zimbra Deployment with MTA external relay

    Hi all,

    Ive referred to the documentation on system requirements and its mentioned that a minimum of 2gb ram is required for production environments. My understanding is that Zimbra MTA service eats up a chunk of the memory. I have a production linux email system that I am looking to use to relay the MTA. The purpose of this exercise is to use zimbra as the graphical front-end. I am looking to deploy a low end VPS to deploy Zimbra and as ram is the most expensive component in hosting, im trying to get a better understanding if my setup would suffice with 512mb or 1gb of ram.


    Cheers,
    Mango

  2. #2
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    Quote Originally Posted by mango View Post
    im trying to get a better understanding if my setup would suffice with 512mb or 1gb of ram.
    I have a 5 user installation running in a VM. Here's the top memory consumers.

    Code:
      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND    
     8756 zimbra    20   0  804m 458m 4956 S    1 22.9 163:04.55 java                                                                                            
    23244 zimbra    20   0  603m 198m  12m S    0  9.9  37:44.74 java                                                                                            
     8960 zimbra    20   0  274m 141m 1056 S    0  7.1   5:31.47 clamd                                                                                           
     7637 zimbra    20   0  565m 110m 2932 S    0  5.5  15:13.84 slapd                                                                                           
     8693 zimbra    20   0  586m  83m 2548 S    0  4.2  19:32.12 mysqld                                                                                          
     5414 zimbra    20   0  209m  67m 3740 S    0  3.4   0:05.20 amavisd                                                                                         
    18121 zimbra    20   0  209m  67m 3824 S    0  3.4   0:12.36 amavisd                                                                                         
    21830 zimbra    20   0  210m  64m 2780 S    0  3.2   0:14.29 amavisd                                                                                         
    19403 zimbra    20   0  210m  64m 2492 S    0  3.2   0:07.73 amavisd                                                                                         
     6334 zimbra    20   0  210m  63m 2876 S    0  3.2   0:10.15 amavisd                                                                                         
    14115 zimbra    20   0  209m  63m 3680 S    0  3.2   0:12.12 amavisd                                                                                         
     4173 zimbra    20   0  204m  63m 4180 S    0  3.2   0:03.08 amavisd                                                                                         
    27905 zimbra    20   0  208m  61m 2348 S    0  3.0   0:03.76 amavisd                                                                                         
     2418 zimbra    20   0  201m  55m 2868 S    0  2.8   0:01.03 amavisd                                                                                         
     8451 zimbra    20   0 96408  29m 1748 S    0  1.5   0:05.07 httpd
    There's almost a gig resident just in that lot. I had to allocate 2G of ram and a dedicated swap partition. Even with 2G I'm still looking at 500M paged out at any time.

  3. #3
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by mango View Post
    ..... im trying to get a better understanding if my setup would suffice with 512mb or 1gb of ram.
    You went through this in a thread in 2009, ZCS uses RAM and you need to (at least) the minimum for it to work correctly.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  4. #4
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    @Brad - Thanks for providing me a dump of your existing ram usage.
    @Phoenix - Thanks, I understand that zimbra requires a good 2-4gb ram to optimally operate. I guess the reason why I had surfaced the question was to see if disabling zimbra MTA would dramatically reduce the memory dependency or not, but courtesy of Brad I can see now that the memory is consumed by a variety of services not just the MTA. I have not worked with zimbra since 2009(pre-vmware days) so I wasnt sure if there have been major changes since.

  5. #5
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    Our setup has zimbra relaying through another mta, so there is not a lot of memory to be saved there either.

    I forget what I configured the VM with initially, it might have been a gig. I really had to wind it up to 2G to stop it thrashing.
    It's been at 2G now since about May last year, and the VM only comes down for host kernel upgrades (about every 100-200 days), so it's comfortable for a small deployment.

    Zimbra is fairly resource intensive, but nothing compared to the Windows XP VM that is running our BES Express instance.

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