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Thread: Zimbra KVM locking up

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  1. #1
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    Default Zimbra KVM locking up

    Hi all,

    I have an Ubuntu 10.04 physical host running KVM. This host runs several
    Ubuntu 10.04 VMs, one of which is running Zimbra
    (7.0.1_GA_3105.UBUNTU10_64 UBUNTU10_64 NETWORK).

    5 times since September last year I've had just this VM completely lock
    up at seemingly irregular intervals, and I can find no pattern as to why
    it's happening, but would like to either be able to confirm or discount
    Zimbra as a cause.

    When the lock-up occurs, I can't ping the VM, view its console (using
    the KVM VNC console; it just sits there not even loading a blank
    screen), or shutdown the VM. When I try to shut it down, nothing appears
    to happen, and if I then try to kill the VM, the dead (zombie) process
    stuck around, and KVM thought it was still running, so wouldn't let me
    start it back up without rebooting the physical host. In 4 out of 5
    cases, all other VMs and the host OS were unaffected. In the 5th, all
    VMs locked up.

    Has anybody seen anything like this before?

  2. #2
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    I have seen such behaviour of KVM on Ubuntu and Debian.

    If there is room for testing, I would try to take this to RHEL or Fedora hosts and VMs.

    Having said that, can you elaborate on the host and VM configuration and resources available?

  3. #3
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    I could not confirm this specific behavior. But I also found some irregular behavior of the Zimbra KVM guest. No problems with other guests!

    So from my point of view it is worth for Zimbra to look into this.
    ---
    Ubuntu 12.04 - Release 8.0.2.GA.5569.UBUNTU12.64 UBUNTU12_64 FOSS edition. - z-push

  4. #4
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    Quote Originally Posted by friedmar View Post
    I could not confirm this specific behavior. But I also found some irregular behavior of the Zimbra KVM guest. No problems with other guests!
    Well, I know of a large (~5k users) Zimbra setup running on RHEL+KVM for years now, and no such issues were encountered.

    Zimbra seems to be a bit of a resource hog, probably due to all the Java stack it uses (still light as a feather compared to msexchange though). There might be some tweaks around the Java memory management side of things, but I'm not aware of those.

    BTW, my own setup is restarted every 24 hours, by the backup script, any chance you're running 24/7?

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    Quote Originally Posted by Olorin View Post
    BTW, my own setup is restarted every 24 hours, by the backup script, any chance you're running 24/7?
    Do you mean Zimbra or your complete server?

  6. #6
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    zimbra services

  7. #7
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    Hi all, thank you all for your responses, and sorry for the delay in
    getting back with more information.

    Zimbra is configured to do an incremental backup nightly (plus a full
    backup weekly), though I don't know whether that is supposed to restart
    Zimbra services in the process. If it doesn't, then yes, Zimbra not
    being restarted regularly to my knowledge (except for a reboot of the
    entire host once a month).

    More detail in my setup is:

    * I have an Ubuntu 10.04 host running KVM with libvirt.

    * Each VM's storage is a raw LV for the OS, and, for those that need it,
    another raw LV for data. The Zimbra VM has 4 LVs for it: / (2.0G of
    7.9G used, /opt (356G of 493G used), /opt/zimbra/backup (814G of 1.2T
    used), and swap (~9G).

    * The VMs themselves are also running Ubuntu 10.04. It's worth noting
    that these systems haven't had security patches applied for a long
    time, despite my best efforts (the customer is holding this up a bit).
    I'm hoping that once these updates happen, the problem will go away,
    but in the interim, I'm looking into other possible causes.

    * The Zimbra has 8GB RAM dedicated to it, as well as 4 cores of an AMD
    Opteron(tm) Processor 6134 dedicated to it. The whole server has 2 of
    these processors.

    * I'm not in a position to be able to test this setup on Redhat-based
    hosts.

    Hope this is enough information to evoke some new suggestions. Thanks
    again for your time.

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