| 1 | <?xml version='1.0' encoding='UTF-8'?>
|
|---|
| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
|
|---|
| 3 | <topic xml:lang="en-us" id="ts_ide-sata-flush">
|
|---|
| 4 | <title>Responding to Guest IDE/SATA Flush Requests</title>
|
|---|
| 5 |
|
|---|
| 6 | <body>
|
|---|
| 7 | <p>
|
|---|
| 8 | If desired, the virtual disk images can be flushed when the
|
|---|
| 9 | guest issues the IDE FLUSH CACHE command. Normally these
|
|---|
| 10 | requests are ignored for improved performance. The parameters
|
|---|
| 11 | below are only accepted for disk drives. They must not be set
|
|---|
| 12 | for DVD drives.
|
|---|
| 13 | </p>
|
|---|
| 14 | <p>
|
|---|
| 15 | To enable flushing for IDE disks, issue the following command:
|
|---|
| 16 | </p>
|
|---|
| 17 | <pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal/Devices/piix3ide/0/LUN#[<varname>x</varname>]/Config/IgnoreFlush" 0</pre>
|
|---|
| 18 | <p><codeph>[<varname>x</varname>]</codeph> specifies the
|
|---|
| 19 | disk. Enter <codeph>0</codeph> for device 0 on the primary
|
|---|
| 20 | channel, <codeph>1</codeph> for device 1 on the primary
|
|---|
| 21 | channel, <codeph>2</codeph> for device 0 on the secondary
|
|---|
| 22 | channel, or <codeph>3</codeph> for device 1 on the secondary
|
|---|
| 23 | channel.
|
|---|
| 24 | </p>
|
|---|
| 25 | <p>
|
|---|
| 26 | To enable flushing for SATA disks, issue the following command:
|
|---|
| 27 | </p>
|
|---|
| 28 | <pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal/Devices/ahci/0/LUN#[x]/Config/IgnoreFlush" 0</pre>
|
|---|
| 29 | <p>
|
|---|
| 30 | The value [x] that selects the disk can be a value between 0 and
|
|---|
| 31 | 29.
|
|---|
| 32 | </p>
|
|---|
| 33 | <p>
|
|---|
| 34 | Note that this does not affect the flushes performed according
|
|---|
| 35 | to the configuration described in
|
|---|
| 36 | <xref href="ts_config-periodic-flush.dita#ts_config-periodic-flush"/>. Restoring the
|
|---|
| 37 | default of ignoring flush commands is possible by setting the
|
|---|
| 38 | value to 1 or by removing the key.
|
|---|
| 39 | </p>
|
|---|
| 40 | </body>
|
|---|
| 41 |
|
|---|
| 42 | </topic>
|
|---|
