</refsect3>
+ <refsect3>
+ <title>GROW-DISK</title>
+ <cmdsynopsis>
+ <command>grow-disk</command>
+ <arg choice="req"><replaceable>instance</replaceable></arg>
+ <arg choice="req"><replaceable>disk</replaceable></arg>
+ <arg choice="req"><replaceable>amount</replaceable></arg>
+ </cmdsynopsis>
+
+ <para>
+ Grows an instance's disk. This is only possible for
+ instances having a <literal>plain</literal> or
+ <literal>drbd</literal> disk template.
+ </para>
+
+ <para>
+ Note that this command only change the block device size; it
+ will not grow the actual filesystems, partitions, etc. that
+ live on that disk. Usually, you will need to:
+ <orderedlist>
+ <listitem>
+ <simpara>use <command>gnt-instance grow-disk</command></simpara>
+ </listitem>
+ <listitem>
+ <simpara>reboot the instance (later, at a convenient
+ time)</simpara>
+ </listitem>
+ <listitem>
+ <simpara>use a filesystem resizer, such as
+ <citerefentry> <refentrytitle>ext2online</refentrytitle>
+ <manvolnum>8</manvolnum> </citerefentry> or
+ <citerefentry> <refentrytitle>xfs_growfs</refentrytitle>
+ <manvolnum>8</manvolnum> </citerefentry> to resize the
+ filesystem, or use <citerefentry>
+ <refentrytitle>fdisk</refentrytitle>
+ <manvolnum>8</manvolnum> </citerefentry> to change the
+ partition table on the disk
+ </simpara>
+ </listitem>
+ </orderedlist>
+ </para>
+
+
+ <para>
+ The <replaceable>disk</replaceable> argument is either
+ <literal>sda</literal> or <literal>sdb</literal>. The
+ <replaceable>amount</replaceable> argument is given either
+ as a number (and it represents the amount to increase the
+ disk with in mebibytes) or can be given similar to the
+ arguments in the create instance operation, with a suffix
+ denoting the unit.
+ </para>
+
+ <para>
+ Note that the disk grow operation might complete on one node
+ but fail on the other; this will leave the instance with
+ different-sized LVs on the two nodes, but this will not
+ create problems (except for unused space).
+ </para>
+
+ <para>Example (increasing sda for instance1 with 16GiB):
+ <screen>
+# gnt-instance grow-disk instance1.example.com sda 16g
+ </screen>
+ </para>
+
+ <para>
+ Also note that disk shrinking will not be supported; use
+ <command>gnt-backup export</command> and then
+ <command>gnt-backup import</command> to reduce the disk size
+ of an instance.
+ </para>
+ </refsect3>
+
</refsect2>
<refsect2>