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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_ide-sata-flush">
<title>Responding to Guest IDE/SATA Flush Requests</title>
<body>
<p> If required, the virtual disk images can be flushed when the guest issues the IDE FLUSH
CACHE command. Normally these requests are ignored for improved performance. The parameters
below are only accepted for disk drives. They must not be set for DVD drives. </p>
<p>
To enable flushing for IDE disks, issue the following command:
</p>
<pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal/Devices/piix3ide/0/LUN#[<varname>x</varname>]/Config/IgnoreFlush" 0</pre>
<p><codeph>[<varname>x</varname>]</codeph> specifies the
disk. Enter <codeph>0</codeph> for device 0 on the primary
channel, <codeph>1</codeph> for device 1 on the primary
channel, <codeph>2</codeph> for device 0 on the secondary
channel, or <codeph>3</codeph> for device 1 on the secondary
channel.
</p>
<p>
To enable flushing for SATA disks, issue the following command:
</p>
<pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal/Devices/ahci/0/LUN#[x]/Config/IgnoreFlush" 0</pre>
<p>
The value [x] that selects the disk can be a value between 0 and
29.
</p>
<p>
Note that this does not affect the flushes performed according
to the configuration described in
<xref href="ts_config-periodic-flush.dita#ts_config-periodic-flush"/>. Restoring the
default of ignoring flush commands is possible by setting the
value to 1 or by removing the key.
</p>
</body>
</topic>
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