| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="vboxwatchdog-ballonctrl">
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| 4 | <title>Memory Ballooning Control</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>The memory ballooning control inflates and deflates the memory balloon of VMs based on the VMs free memory and
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| 8 | the requested maximum balloon size. </p>
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| 9 | <p>To set up the memory ballooning control the maximum ballooning size a VM can reach needs to be set. This can be
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| 10 | specified using the command line, as follows: </p>
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| 11 | <pre xml:space="preserve">--balloon-max <Size in MB></pre>
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| 12 | <p>Using a per-VM basis extradata value, as follows: </p>
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| 13 | <pre xml:space="preserve">VBoxManage setextradata <VM-Name> VBoxInternal2/Watchdog/BalloonCtrl/BalloonSizeMax <Size in MB></pre>
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| 14 | <p>Using a global extradata value, as follows: </p>
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| 15 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonSizeMax <Size in MB></pre>
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| 16 | <note>
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| 17 | <p>If no maximum ballooning size is specified by at least one of the parameters above, no ballooning will be
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| 18 | performed at all. </p>
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| 19 | </note>
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| 20 | <p>Setting the ballooning increment in MB can be either done using command line, as follows: </p>
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| 21 | <pre xml:space="preserve">--balloon-inc <Size in MB></pre>
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| 22 | <p>Using a global extradata value, as follows: </p>
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| 23 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonIncrementMB <Size in MB></pre>
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| 24 | <p>The default ballooning increment is 256 MB if not specified. </p>
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| 25 | <p>The same options apply for a ballooning decrement. Using the command line, as follows: </p>
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| 26 | <pre xml:space="preserve">--balloon-dec <Size in MB></pre>
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| 27 | <p>Using a global extradata value, as follows: </p>
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| 28 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonDecrementMB <Size in MB></pre>
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| 29 | <p>The default ballooning decrement is 128 MB if not specified. </p>
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| 30 | <p>The lower limit in MB for a balloon can be defined using the command line, as follows: </p>
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| 31 | <pre xml:space="preserve">--balloon-lower-limit <Size in MB></pre>
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| 32 | <p>Using a global extradata value, as follows: </p>
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| 33 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonLowerLimitMB <Size in MB></pre>
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| 34 | <p>The default lower limit is 128 MB if not specified. </p>
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| 35 | </body>
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| 36 |
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| 37 | </topic>
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