environment.</para>
</caution>
</section>
- <section xml:id="dbdoclet.50438194_69255">
+ <section xml:id="dbdoclet.shutdownLustre">
+ <title>
+ <indexterm>
+ <primary>operations</primary>
+ <secondary>shutdownLustre</secondary>
+ </indexterm>Stopping the Filesystem</title>
+ <para>A complete Lustre filesystem shutdown occurs by unmounting all
+ clients and servers in the order shown below. Please note that unmounting
+ a block device causes the Lustre software to be shut down on that node.
+ </para>
+ <note><para>Please note that the <literal>-a -t lustre</literal> in the
+ commands below is not the name of a filesystem, but rather is
+ specifying to unmount all entries in /etc/mtab that are of type
+ <literal>lustre</literal></para></note>
+ <orderedlist>
+ <listitem><para>Unmount the clients</para>
+ <para>On each client node, unmount the filesystem on that client
+ using the <literal>umount</literal> command:</para>
+ <para><literal>umount -a -t lustre</literal></para>
+ <para>The example below shows the unmount of the
+ <literal>testfs</literal> filesystem on a client node:</para>
+ <para><screen>[root@client1 ~]# mount |grep testfs
+XXX.XXX.0.11@tcp:/testfs on /mnt/testfs type lustre (rw,lazystatfs)
+
+[root@client1 ~]# umount -a -t lustre
+[154523.177714] Lustre: Unmounted testfs-client</screen></para>
+ </listitem>
+ <listitem><para>Unmount the MDT and MGT</para>
+ <para>On the MGS and MDS node(s), use the <literal>umount</literal>
+ command:</para>
+ <para><literal>umount -a -t lustre</literal></para>
+ <para>The example below shows the unmount of the MDT and MGT for
+ the <literal>testfs</literal> filesystem on a combined MGS/MDS:
+ </para>
+ <para><screen>[root@mds1 ~]# mount |grep lustre
+/dev/sda on /mnt/mgt type lustre (ro)
+/dev/sdb on /mnt/mdt type lustre (ro)
+
+[root@mds1 ~]# umount -a -t lustre
+[155263.566230] Lustre: Failing over testfs-MDT0000
+[155263.775355] Lustre: server umount testfs-MDT0000 complete
+[155269.843862] Lustre: server umount MGS complete</screen></para>
+ <para>For a seperate MGS and MDS, the same command is used, first on
+ the MDS and then followed by the MGS.</para>
+ </listitem>
+ <listitem><para>Unmount all the OSTs</para>
+ <para>On each OSS node, use the <literal>umount</literal> command:
+ </para>
+ <para><literal>umount -a -t lustre</literal></para>
+ <para>The example below shows the unmount of all OSTs for the
+ <literal>testfs</literal> filesystem on server
+ <literal>OSS1</literal>:
+ </para>
+ <para><screen>[root@oss1 ~]# mount |grep lustre
+/dev/sda on /mnt/ost0 type lustre (ro)
+/dev/sdb on /mnt/ost1 type lustre (ro)
+/dev/sdc on /mnt/ost2 type lustre (ro)
+
+[root@oss1 ~]# umount -a -t lustre
+[155336.491445] Lustre: Failing over testfs-OST0002
+[155336.556752] Lustre: server umount testfs-OST0002 complete</screen></para>
+ </listitem>
+ </orderedlist>
+ <para>For unmount command syntax for a single OST, MDT, or MGT target
+ please refer to <xref linkend="dbdoclet.umountTarget"/></para>
+ </section>
+ <section xml:id="dbdoclet.umountTarget">
<title>
<indexterm>
<primary>operations</primary>
<secondary>unmounting</secondary>
- </indexterm>Unmounting a Server</title>
- <para>To stop a Lustre server, use the
+ </indexterm>Unmounting a Specific Target on a Server</title>
+ <para>To stop a Lustre OST, MDT, or MGT , use the
<literal>umount
- <replaceable>/mount</replaceable>
- <replaceable>point</replaceable></literal> command.</para>
- <para>For example, to stop
- <literal>ost0</literal> on mount point
- <literal>/mnt/test</literal>, run:</para>
- <screen>
-$ umount /mnt/test
-</screen>
+ <replaceable>/mount_point</replaceable></literal> command.</para>
+ <para>The example below stops an OST, <literal>ost0</literal>, on mount
+ point <literal>/mnt/ost0</literal> for the <literal>testfs</literal>
+ filesystem:</para>
+ <screen>[root@oss1 ~]# umount /mnt/ost0
+[ 385.142264] Lustre: Failing over testfs-OST0000
+[ 385.210810] Lustre: server umount testfs-OST0000 complete</screen>
<para>Gracefully stopping a server with the
<literal>umount</literal> command preserves the state of the connected
clients. The next time the server is started, it waits for clients to
</para>
</note>
</section>
- <section xml:id="dbdoclet.50438194_54138">
+ <section xml:id="dbdoclet.degraded_ost">
<title>
<indexterm>
<primary>operations</primary>
resets to
<literal>0</literal>.</para>
<para>It is recommended that this be implemented by an automated script
- that monitors the status of individual RAID devices.</para>
+ that monitors the status of individual RAID devices, such as MD-RAID's
+ <literal>mdadm(8)</literal> command with the <literal>--monitor</literal>
+ option to mark an affected device degraded or restored.</para>
</section>
<section xml:id="dbdoclet.50438194_88063">
<title>
<para>The Lustre 2.8 DNE feature enables individual files in a given
directory to store their metadata on separate MDTs (a <emphasis>striped
directory</emphasis>) once additional MDTs have been added to the
- filesystem, see <xref linkend="dbdoclet.addingamdt"/>.
+ filesystem, see <xref linkend="dbdoclet.adding_new_mdt"/>.
The result of this is that metadata requests for
files in a striped directory are serviced by multiple MDTs and metadata
service load is distributed over all the MDTs that service a given
<replaceable>new_parameters</replaceable>
</screen>
<para>The tunefs.lustre command can be used to set any parameter settable
- in a /proc/fs/lustre file and that has its own OBD device, so it can be
- specified as
+ via <literal>lctl conf_param</literal> and that has its own OBD device,
+ so it can be specified as
<literal>
<replaceable>obdname|fsname</replaceable>.
<replaceable>obdtype</replaceable>.
are active as long as the server or client is not shut down. Permanent
parameters live through server and client reboots.</para>
<note>
- <para>The lctl list_param command enables users to list all parameters
- that can be set. See
+ <para>The <literal>lctl list_param</literal> command enables users to
+ list all parameters that can be set. See
<xref linkend="dbdoclet.50438194_88217" />.</para>
</note>
<para>For more details about the
<literal>/proc/{fs,sys}/{lnet,lustre}</literal>. The
<literal>lctl set_param</literal> command uses this syntax:</para>
<screen>
-lctl set_param [-n]
+lctl set_param [-n] [-P]
<replaceable>obdtype</replaceable>.
<replaceable>obdname</replaceable>.
<replaceable>proc_file_name</replaceable>=
</section>
<section xml:id="dbdoclet.50438194_64195">
<title>Setting Permanent Parameters</title>
- <para>Use the
+ <para>Use <literal>lctl set_param -P</literal> or
<literal>lctl conf_param</literal> command to set permanent parameters.
In general, the
<literal>lctl conf_param</literal> command can be used to specify any
</section>
<section xml:id="dbdoclet.setparamp" condition='l25'>
<title>Setting Permanent Parameters with lctl set_param -P</title>
- <para>Use the
- <literal>lctl set_param -P</literal> to set parameters permanently. This
- command must be issued on the MGS. The given parameter is set on every
- host using
- <literal>lctl</literal> upcall. Parameters map to items in
- <literal>/proc/{fs,sys}/{lnet,lustre}</literal>. The
- <literal>lctl set_param</literal> command uses this syntax:</para>
+ <para>The <literal>lctl set_param -P</literal> command can also
+ set parameters permanently. This command must be issued on the MGS.
+ The given parameter is set on every host using
+ <literal>lctl</literal> upcall. Parameters map to items in
+ <literal>/proc/{fs,sys}/{lnet,lustre}</literal>. The
+ <literal>lctl set_param</literal> command uses this syntax:</para>
<screen>
lctl set_param -P
<replaceable>obdtype</replaceable>.
<para>To copy the contents of an existing OST to a new OST (or an old MDT
to a new MDT), follow the process for either OST/MDT backups in
<xref linkend='dbdoclet.backup_device' />or
- <xref linkend='dbdoclet.backup_target_filesystem' />.
+ <xref linkend='backup_fs_level' />.
For more information on removing a MDT, see
<xref linkend='dbdoclet.rmremotedir' />.</para>
</section>
git://git.whamcloud.com / doc / manual.git / blobdiff