| 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>
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| 8 | The memory ballooning control inflates and deflates the memory
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| 9 | balloon of VMs based on the VMs free memory and the desired
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| 10 | maximum balloon size.
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| 11 | </p>
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| 12 | <p>
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| 13 | To set up the memory ballooning control the maximum ballooning
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| 14 | size a VM can reach needs to be set. This can be specified using
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| 15 | the command line, as follows:
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| 16 | </p>
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| 17 | <pre xml:space="preserve">--balloon-max <Size in MB></pre>
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| 18 | <p>
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| 19 | Using a per-VM basis extradata value, as follows:
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| 20 | </p>
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| 21 | <pre xml:space="preserve">VBoxManage setextradata <VM-Name> VBoxInternal2/Watchdog/BalloonCtrl/BalloonSizeMax <Size in MB></pre>
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| 22 | <p>
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| 23 | Using a global extradata value, as follows:
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| 24 | </p>
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| 25 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonSizeMax <Size in MB></pre>
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| 26 | <note>
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| 27 | <p>
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| 28 | If no maximum ballooning size is specified by at least one of
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| 29 | the parameters above, no ballooning will be performed at all.
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| 30 | </p>
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| 31 | </note>
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| 32 | <p>
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| 33 | Setting the ballooning increment in MB can be either done using
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| 34 | command line, as follows:
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| 35 | </p>
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| 36 | <pre xml:space="preserve">--balloon-inc <Size in MB></pre>
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| 37 | <p>
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| 38 | Using a global extradata value, as follows:
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| 39 | </p>
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| 40 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonIncrementMB <Size in MB></pre>
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| 41 | <p>
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| 42 | The default ballooning increment is 256 MB if not specified.
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| 43 | </p>
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| 44 | <p>
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| 45 | The same options apply for a ballooning decrement. Using the
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| 46 | command line, as follows:
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| 47 | </p>
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| 48 | <pre xml:space="preserve">--balloon-dec <Size in MB></pre>
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| 49 | <p>
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| 50 | Using a global extradata value, as follows:
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| 51 | </p>
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| 52 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonDecrementMB <Size in MB></pre>
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| 53 | <p>
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| 54 | The default ballooning decrement is 128 MB if not specified.
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| 55 | </p>
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| 56 | <p>
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| 57 | The lower limit in MB for a balloon can be defined using the
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| 58 | command line, as follows:
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| 59 | </p>
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| 60 | <pre xml:space="preserve">--balloon-lower-limit <Size in MB></pre>
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| 61 | <p>
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| 62 | Using a global extradata value, as follows:
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| 63 | </p>
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| 64 | <pre xml:space="preserve">VBoxManage setextradata global VBoxInternal2/Watchdog/BalloonCtrl/BalloonLowerLimitMB <Size in MB></pre>
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| 65 | <p>
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| 66 | The default lower limit is 128 MB if not specified.
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| 67 | </p>
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| 68 | </body>
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| 69 |
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| 70 | </topic>
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