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  1. #1
    Join Date
    Apr 2004
    Location
    Singapore
    Posts
    1,096

    Mail Server Performance Tuning

    Hi,

    I am using the following spec, for one of my customer as a mail server around 1000 email user, with clamav antivirus, spamassasin spam filter and sendmail, pop3/imap, but the server load is pretty high, load average 4, peak to 10 to 12.

    Dell PowerEdge 2850.
    2 x Intel Xeon 2.8Ghz 1MB Cache
    2GB ECC DDR2-400 RAM
    2 x 73GB SCSI HDD (Non raid)
    OS: Fedora1

    Below is the mail statistic of the mail server, average processing 10,000 a day. The load mainly can from, virus scan, spam filtering, and user login/logout of pop3/imap (around 15,000 login to pop3 per day).

    Statistics from Tue Aug 30 17:57:24 2005
    M msgsfr bytes_from msgsto bytes_to msgsrej msgsdis Mailer
    4 146970 14624267K 64201 6868926K 15927 0 esmtp
    9 59444 11008351K 291417 21041350K 3895 0 virthostmail
    10 223059 2425506K 61061 280865K 431 0 local
    ================================================== ===========
    T 429473 28058124K 416679 28191141K 20253 0
    C 413174 107852 20253

    Any recommendation to reduce the server load, will adding more RAM helps ?

    Alan
    __________________
    Alan Woo

    Technical Consultant
    NewMedia Express Pte Ltd
    Web Hosting Singapore
    http://www.newmediaexpress.com
    Tel: +65 62927661
    Alan Woo, alan [@] newmediaexpress.com
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  2. #2
    Join Date
    Mar 2004
    Location
    Singapore
    Posts
    6,984
    It would be much easier if you add a barracuda or sonic wall to filter off the spam and virus so that you can disable spamassassin and clamav. Disabling these two should bring about a great increase in the overall performance.

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