XenServer 4.0 and 4.1 Dom0 Memory

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    Woohoo for XenServer 4.0 and 4.1, they run out of Dom0 memory because they don't configure themselves correctly.  This is probably most noticable when you are doing an import or export or when you are trying to do something unsupported like making the thing send emails from services that you'd normally like to hear from (like logrotate or smartd).

    If you're running 4.0 you're screwed, you can't get Dom0 any more memory because it would appear that it has a bug.  In 4.1 you can manage this by editing /etc/sysconfig/xapi and making sure you have something like this set:

    XAPI_DOM0_MEM_BASE="384"

    Set that to the amount of memory you'd like to add to the already 160 or so that is its default.  In my example there my Dom0 Memory goes up to ~560MB.  You don't need to reboot, just restart xapi.

    I've read that if you send your memory over 752MB (what an odd number for a default memory size) that is set in your /boot/grub/grub.conf you may create problems for yourself.  I've not tried this.

     

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