CTX134951
XenServer
XenServer 6_2_0,XenServer 6_1_0
Installation/Upgrade
2016-04-29
2005-06-06
This article describes how to configure Control Domain (dom0) memory in XenServer 6.1.0 or later.

Objective

This article describes how to configure Control Domain (dom0) memory in XenServer 6.1.0??and later.

Customers running more than 50 Virtual Machines (VM)??per XenServer host might wish to increase the memory allocated to dom0. The following section provides instructions to configure the dom0 memory.

Instructions

To configure the dom0 memory, complete the following procedure:

  1. On the XenServer host, open a local shell and log on as root.

  2. Enter the following command:
    /opt/xensource/libexec/xen-cmdline --set-xen dom0_mem=<nn>M,max:<nn>M??
    Note:
    <nn> represents the memory in megabytes, to be allocated to dom0. This value should be between 1024 and 4096, depending on the number of VMs that are expected to run and the total memory of the host. A higher value results in less memory being available to the VMs.

    Example :??/opt/xensource/libexec/xen-cmdline --set-xen dom0_mem=4096M,max:4096M
    Note:??
    The above command will set the dom0 memory to 4GB or 4096 MB.
    User-added image

  3. Reboot the XenServer host using XenCenter or reboot command on the console.
    After the host is rebooted, run the command free on the console to verify the new memory settings.

Note: On smaller memory machines (less than 16GiB), some customers may want to reduce the memory allocated to dom0??lesser than the default of 752MiB. Customers can follow the preceding instructions??to reduce the dom0 memory. However, Citrix recommends that you should not reduce the dom0 memory??to??lesser??than 400MB.


Additional Resources

If you experience any difficulties, contact Citrix Technical Support. For more information about XenServer 6.1.0 refer to CTX134582 - XenServer 6.1.0 Release Notes

To increase dom0 memory in prior versions of XenServer, refer CTX126531??- How to Configure dom0 Memory in XenServer 5.6 or Later

 

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