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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="ts_sol-host-zfs">
<title>Cannot Start VM, Not Enough Contiguous Memory</title>
<body>
<p>
The ZFS file system is known to use nearly all available RAM as
cache if the default system settings are not changed. This may
lead to a heavy fragmentation of the host memory preventing
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> VMs from being started. We recommend to limit the
ZFS cache by adding the following line to
<filepath>/etc/system</filepath>, where
<varname>xxxx</varname> bytes is the amount of memory
usable for the ZFS cache.
</p>
<pre xml:space="preserve">set zfs:zfs_arc_max = xxxx</pre>
</body>
</topic>
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