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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="storage-bandwidth-limit">
<title>Limiting Bandwidth for Disk Images</title>
<body>
<p>
Oracle VM VirtualBox supports limiting of the maximum bandwidth used for
asynchronous I/O. Additionally it supports sharing limits through
bandwidth groups for several images. It is possible to have more
than one such limit.
</p>
<p>
Limits are configured using <userinput>VBoxManage</userinput>. The
example below creates a bandwidth group named Limit, sets the
limit to 20 MB per second, and assigns the group to the attached
disks of the VM:
</p>
<pre xml:space="preserve">VBoxManage bandwidthctl "VM name" add Limit --type disk --limit 20M
VBoxManage storageattach "VM name" --storagectl "SATA" --port 0 --device 0 --type hdd
--medium disk1.vdi --bandwidthgroup Limit
VBoxManage storageattach "VM name" --storagectl "SATA" --port 1 --device 0 --type hdd
--medium disk2.vdi --bandwidthgroup Limit</pre>
<p>
All disks in a group share the bandwidth limit, meaning that in
the example above the bandwidth of both images combined can never
exceed 20 MBps. However, if one disk does not require bandwidth
the other can use the remaining bandwidth of its group.
</p>
<p>
The limits for each group can be changed while the VM is running,
with changes being picked up immediately. The example below
changes the limit for the group created in the example above to 10
MBps:
</p>
<pre xml:space="preserve">VBoxManage bandwidthctl "VM name" set Limit --limit 10M</pre>
</body>
</topic>
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