Results 1 to 10 of 10

Thread: Memory and Performance

  1. #1
    plan9 is offline Loyal Member
    Join Date
    Apr 2006
    Posts
    76
    Rep Power
    9

    Default Memory and Performance

    I'm working with a small installation of about 70 users, all using the web client.

    I'm running Zimbra on a dual Xeon 2.2 Ghz with 2 GB RAM and RAID 5.

    On such a small installation, will adding more memory to the server improve performance noticeably?

    Thanks.

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
    Join Date
    Sep 2005
    Location
    Vannes, France
    Posts
    23,201
    Rep Power
    56

    Default

    More memory will always help but getting rid of raid5 will help even more.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    plan9 is offline Loyal Member
    Join Date
    Apr 2006
    Posts
    76
    Rep Power
    9

    Default

    Really? I had no idea that would create much of a bottleneck. What RAID level will give me the best performance?

  4. #4
    Klug's Avatar
    Klug is offline Moderator
    Join Date
    Mar 2006
    Location
    Beaucaire, France
    Posts
    2,292
    Rep Power
    13

    Default

    RAID 10 (0+1) as stated in the document and multiple posts in the forum.

  5. #5
    plan9 is offline Loyal Member
    Join Date
    Apr 2006
    Posts
    76
    Rep Power
    9

    Default

    Okay, I've rebuilt my box to RAID 0+1.

    Will installing more than 4 gigabytes of memory be of any benefit? I've read some posts about 2 gigabyte limits and others about problems when exceeding 4 gigabytes.

  6. #6
    phoenix is online now Zimbra Consultant & Moderator
    Join Date
    Sep 2005
    Location
    Vannes, France
    Posts
    23,201
    Rep Power
    56

    Default

    If this isn't a 64bit system then you'll have problems with 4Gb, have a look at this post: memory related issue on FC5
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  7. #7
    Klug's Avatar
    Klug is offline Moderator
    Join Date
    Mar 2006
    Location
    Beaucaire, France
    Posts
    2,292
    Rep Power
    13

    Default

    Bill, do you know if this 2GB limit only hits FC5 or also CentOS ?

    I have a 4GB (quad 700 MHz Xeon) server running CentOS4.4 and Zimbra OSS and have not seen any issue yet.

  8. #8
    phoenix is online now Zimbra Consultant & Moderator
    Join Date
    Sep 2005
    Location
    Vannes, France
    Posts
    23,201
    Rep Power
    56

    Default

    I believe it's any 32bit system. There's no guarantee that you'll hit it, I can't remember offhand what triggers it - could be number of connected users.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  9. #9
    plan9 is offline Loyal Member
    Join Date
    Apr 2006
    Posts
    76
    Rep Power
    9

    Default

    The ZCS Installation Quick Start guide lists a 2 GB minimum, but a 4 GB recommended RAM configuration. I suppose the 4 GB applies to 64-bit processors.
    Last edited by plan9; 11-27-2006 at 07:27 AM.

  10. #10
    KevinH's Avatar
    KevinH is offline Expert Member
    Join Date
    Aug 2005
    Location
    San Mateo, CA
    Posts
    4,789
    Rep Power
    18

    Default

    64bit gives you more headroom than you need with memory. The key difference in 32bit v 64bit with respect to memory is how much memory a individual process can take. So MySQL, Tomcat(java), etc in a 64bit env can use more than 3GB each. So moving to 64bit will let you cache more data in memory which will give you a nice performance boost on a busy system assuming you add more RAM. Having more than 4GB of RAM on a 32bit system usually doesn't help too much other than file system caches.
    Looking for new beta users -> Co-Founder of Acompli. Previously worked at Zimbra (and Yahoo! & VMware) since 2005.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Need Help Troubleshooting Web Client Issues
    By soxfan in forum Administrators
    Replies: 2
    Last Post: 03-23-2007, 05:27 AM
  2. Concerns about Zimbra Performance
    By soxfan in forum Administrators
    Replies: 14
    Last Post: 11-15-2006, 11:38 AM
  3. Extremely High Memory Usage for Amavisd
    By atomicfission in forum Installation
    Replies: 4
    Last Post: 10-02-2006, 02:23 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •