<para>where <replaceable>devicename</replaceable> is the Lustre target name, e.g.
<literal>testfs-OST0013</literal></para>
</listitem>
- <listitem>
- <para>If the MGS and MDS share a partition, stop the MGS:</para>
- <screen>umount <replaceable>mount_point</replaceable></screen>
- </listitem>
+ <listitem>
+
<para>If the MGS and MDS share a partition, stop the MGS:</para>
+ <screen>umount <replaceable>mount_point</replaceable></screen>
+ </listitem>
</orderedlist>
- <note><para>The <literal>replace_nids</literal> command also cleans all old, invalidated records out of the configuration log, while preserving all other current settings.</para></note>
- <note><para>The previous configuration log is backed up on the MGS disk with the suffix <literal>'.bak'</literal>.</para></note>
+ <note><para>The <literal>replace_nids</literal> command also cleans
+ all old, invalidated records out of the configuration log, while
+ preserving all other current settings.</para></note>
+ <note><para>The previous configuration log is backed up on the MGS
+ disk with the suffix <literal>'.bak'</literal>.</para></note>
</section>
<section xml:id="dbdoclet.addingamdt" condition='l24'>
<title><indexterm>
<primary>maintenance</primary>
<secondary>adding an MDT</secondary>
</indexterm>Adding a New MDT to a Lustre File System</title>
- <para>Additional MDTs can be added to serve one or more remote sub-directories within the
- file system. It is possible to have multiple remote sub-directories reference the same MDT.
- However, the root directory will always be located on MDT0. To add a new MDT into the file
- system:</para>
+ <para>Additional MDTs can be added using the DNE feature to serve one
+ or more remote sub-directories within a filesystem, in order to
+ increase the total number of files that can be created in the
+ filesystem, to increase aggregate metadata performance, or to isolate
+ user or application workloads from other users of the filesystem. It
+ is possible to have multiple remote sub-directories reference the
+ same MDT. However, the root directory will always be located on
+ MDT0. To add a new MDT into the file system:</para>
<orderedlist>
<listitem>
-
<para>Discover the maximum MDT index. Each MDTs must have unique index.</para>
- <screen>
+ <para>Discover the maximum MDT index. Each MDTs must have unique index.</para>
+<screen>
client$ lctl dl | grep mdc
36 UP mdc testfs-MDT0000-mdc-ffff88004edf3c00 4c8be054-144f-9359-b063-8477566eb84e 5
37 UP mdc testfs-MDT0001-mdc-ffff88004edf3c00 4c8be054-144f-9359-b063-8477566eb84e 5
38 UP mdc testfs-MDT0002-mdc-ffff88004edf3c00 4c8be054-144f-9359-b063-8477566eb84e 5
39 UP mdc testfs-MDT0003-mdc-ffff88004edf3c00 4c8be054-144f-9359-b063-8477566eb84e 5
- </screen>
+</screen>
</listitem>
<listitem>
- <para>Add the new block device as a new MDT at the next available index. In this example, the next available index is 4.</para>
- <screen>
-mds# mkfs.lustre --reformat --fsname=<replaceable>filesystem_name</replaceable> --mdt --mgsnode=<replaceable>mgsnode</replaceable> --index 4 <replaceable>/dev/mdt4_device</replaceable>
- </screen>
+ <para>Add the new block device as a new MDT at the next available
+ index. In this example, the next available index is 4.</para>
+<screen>
+mds# mkfs.lustre --reformat --fsname=<replaceable>testfs</replaceable> --mdt --mgsnode=<replaceable>mgsnode</replaceable> --index 4 <replaceable>/dev/mdt4_device</replaceable>
+</screen>
</listitem>
<listitem>
-
<para>Mount the MDTs.</para>
- <screen>
+ <para>Mount the MDTs.</para>
+<screen>
mds# mount –t lustre <replaceable>/dev/mdt4_blockdevice</replaceable> /mnt/mdt4
- </screen>
+</screen>
</listitem>
</orderedlist>
- </section>
+ </section>
<section xml:id="dbdoclet.50438199_22527">
<title><indexterm><primary>maintenance</primary><secondary>adding a OST</secondary></indexterm>
Adding a New OST to a Lustre File System</title>
git://git.whamcloud.com / doc / manual.git / blobdiff