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Thread: zimbra: how much memory needs for server

  1. #1
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    Default zimbra: how much memory needs for server

    Hello.

    We had a Zimbra Collaboration Suite 6.0 Opensource on Centos x86_64.
    One domain, 33 000 user accounts. At the same time about 250 web sessions and 150 IMAP sessions active. All 4GB server memory and 4Gb server swap are busy.

    How much memory is optimal for this environment? Swap should not be used.

  2. #2
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    Default

    It'll depend on how much data the users are storing, too (how much leeway you give them with quota). Ideally the entire mysql database should fit in memory, plus you probably want about 6 GB of RAM for the various java stuff that runs. We've only got 1000ish users, but they're very heavy IMAP users and we usually have 600 to 700 IMAP sessions active during the daytime. There's also a lot of high quota usage accounts (5 to 10 GB). In our case we found we needed to have about 16 GB of RAM on the mailbox servers (with those users split up roughly 200 per server across 5 mailbox servers, but that's leaving us a little room to grow, I think).

  3. #3
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    Thanks. I think 8Gb is a minimum for what we need. For most of our users disk quota is set to 500Mb. And users do not like to clean the boxes.

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