-<?xml version='1.0' encoding='UTF-8'?>
-<!-- This document was created with Syntext Serna Free. --><chapter xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en-US" xml:id="upgradinglustre">
- <title xml:id="upgradinglustre.title">Upgrading Lustre</title>
- <para>This chapter describes Lustre interoperability and how to upgrade from Lustre 1.8 to Lustre 2.x, and includes the following sections:</para>
+<?xml version='1.0' encoding='utf-8'?>
+<chapter xmlns="http://docbook.org/ns/docbook"
+xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en-US"
+xml:id="upgradinglustre">
+ <title xml:id="upgradinglustre.title">Upgrading a Lustre File System</title>
+ <para>This chapter describes interoperability between Lustre software
+ releases. It also provides procedures for upgrading from Lustre software
+ release 1.8 to Lustre softeware release 2.x , from a Lustre software release
+ 2.x to a more recent Lustre software release 2.x (major release upgrade), and
+ from a a Lustre software release 2.x.y to a more recent Lustre software
+ release 2.x.y (minor release upgrade). It includes the following
+ sections:</para>
<itemizedlist>
<listitem>
- <para><xref linkend="dbdoclet.50438205_82079"/>Lustre Interoperability</para>
+ <para>
+ <xref linkend="dbdoclet.50438205_82079" />
+ </para>
</listitem>
<listitem>
- <para><xref linkend="dbdoclet.50438205_51369"/>Upgrading Lustre 1.8 to 2.x</para>
+ <para>
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="Upgrading_2.x" />
+ </para>
</listitem>
<listitem>
- <para><xref linkend="dbdoclet.upgradetodne"/>Upgrading to multiple metadata targets</para>
+ <para>
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="Upgrading_2.x.x" />
+ </para>
</listitem>
</itemizedlist>
<section xml:id="dbdoclet.50438205_82079">
- <title><indexterm><primary>Lustre</primary><secondary>upgrading</secondary><see>upgrading</see></indexterm>
- <indexterm><primary>upgrading</primary></indexterm>
-
- Lustre Interoperability</title>
- <para>Lustre 2.x is built on a new architectural code base which is different than the one used with Lustre 1.8. These architectural changes require existing Lustre 1.8 users to follow a slightly different procedure to upgrade to Lustre 2.x - requiring clients to be unmounted and the file system be shut down. Once the servers are upgraded and restarted, then the clients can be remounted. After the upgrade, Lustre 2.x servers can interoperate with compatible 1.8 clients and servers. Lustre 2.x does <emphasis>not</emphasis> support 2.x clients interoperating with 1.8 servers.</para>
- <note>
- <para>Lustre 1.8 clients can interoperate with 2.x servers, but the servers should all be upgraded at the same time.</para>
- </note>
- <note>
- <para>Lustre 2.x servers are compatible with clients 1.8.6 and later, though it is strongly recommended that the clients are upgraded to the latest version of Lustre 1.8 available. If you are planning a heterogeneous environment (mixed 1.8 and 2.x servers), make sure that version 1.8.6 or later is installed on the client nodes that are not upgraded to 2.x.</para>
- </note>
- <warning condition='l24'><para>Lustre 2.4 allows remote sub-directories to be hosted on separate MDTs. Clients prior to 2.4 can only see the namespace hosted by MDT0, and will return an IO error if a directory on a remote MDT is accessed.</para></warning>
- </section>
- <section xml:id="dbdoclet.50438205_51369">
- <title><indexterm><primary>upgrading</primary><secondary>1.8 to 2.x</secondary></indexterm>Upgrading Lustre 1.8 to 2.x</title>
- <para>Upgrading from 1.8 to Lustre 2.x involves shutting down the file system and upgrading servers, and optionally clients, all at the same time. This upgrade process does <emphasis>not</emphasis> support a rolling upgrade in which the file system operates continuously while individual servers (or their failover partners) and clients are upgraded one at a time.</para>
- <note>
- <para>Although the Lustre 1.8 to 2.x upgrade path has been tested, optimum performance will be seen with a freshly formatted 2.x filesystem.</para>
- </note>
- <note>
- <para>From Lustre version 2.2, the large xattr (aka wide striping) feature is added to support up to 2000 OSTs. This feature is disabled by default at mkfs.lustre time. To upgrade from an existing filesystem to enable wide striping on the MDT, "<literal>tune2fs -O large_xattr</literal>" needs to be run on the MDT device before mounting it after the upgrade.</para>
- <para>Then, once the wide striping feature is enabled and in use on the MDT, it will not be possible to directly downgrade the MDT filesystem to an earlier version of Lustre that does not support wide striping. The only way to disable it would be to delete all of the files with large xattrs before downgrade, then unmount the MDT, and then run "<literal>tune2fs -O ^large_xattr</literal>" to turn off this filesystem feature.</para>
- </note>
- <section remap="h3">
- <title><indexterm><primary>upgrading</primary><secondary>file system</secondary></indexterm>Performing a File System Upgrade</title>
- <para>This procedure describes a file system upgrade in which Lustre 2.x packages are installed on multiple 1.8 servers and, optionally, clients, requiring a file system shutdown. You can choose to upgrade the entire Lustre file system to 2.x, or just upgrade the servers to Lustre 2.x and leave the clients running 1.8.6 or later.</para>
- <tip>
- <para>In a Lustre upgrade, the package install/update can be done either before or after the filesystem is unmount. To minimize downtime, this procedure first performs the 2.x package installation, and then unmounts the file system.</para>
- </tip>
- <orderedlist>
+ <title>
+ <indexterm>
+ <primary>Lustre</primary>
+ <secondary>upgrading</secondary>
+ <see>upgrading</see>
+ </indexterm>
+ <indexterm>
+ <primary>upgrading</primary>
+ </indexterm>Release Interoperability and Upgrade Requirements</title>
+ <para>
+ <emphasis role="italic">
+ <emphasis role="bold">Lustre software release 2.x (major)
+ upgrade:</emphasis>
+ </emphasis>
+ <itemizedlist>
<listitem>
- <para>Make a complete, restorable file system backup before upgrading Lustre. The Lustre 2.x on-disk format itself is compatible with the 1.8 on-disk format, but having a backup is always important. If it is not possible to backup the full filesystem, it is still valuable to have a full device-level backup of the MDT filesystem, as described in <xref linkend="backupandrestore"/>.</para>
+ <para>All servers must be upgraded at the same time, while some or
+ all clients may be upgraded.</para>
</listitem>
<listitem>
- <para>If you are planning a heterogeneous environment (1.8 clients and 2.x servers), make sure that at least version 1.8.6 is installed on clients that are not upgraded to 2.x.</para>
+ <para>All servers must be be upgraded to a Linux kernel supported by
+ the Lustre software. See the Linux Test Matrix at
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="LustreTestMatrixTable" />for a list of tested Lustre
+ distributions.</para>
</listitem>
<listitem>
- <para>Install the 2.x packages on the Lustre servers and, optionally, the clients.</para>
- <para>All servers must be upgraded from 1.8 to 2.x at the same time. Some or all clients can be upgraded to 2.x at this time.</para>
- <para>For help determining where to install a specific package, see <xref linkend="installinglustre.tab.req"/>.</para>
- <orderedlist>
- <listitem>
- <para>Install the kernel, modules and ldiskfs packages. For example:</para>
- <screen>$ rpm -ivh
-kernel-lustre-smp-<replaceable>ver</replaceable> \
-kernel-ib-<replaceable>ver</replaceable> \
-lustre-modules-<replaceable>ver</replaceable> \
-lustre-ldiskfs-<replaceable>ver</replaceable></screen>
- </listitem>
- <listitem>
- <para>Upgrade the utilities/userspace packages. For example:</para>
- <screen>$ rpm -Uvh lustre-<replaceable>ver</replaceable></screen>
- </listitem>
- <listitem>
- <para>If a new <literal>e2fsprogs</literal> package is available, upgrade it. For example:</para>
- <screen>$ rpm -Uvh e2fsprogs-<replaceable>ver</replaceable>
-</screen>
- <para>Use e2fsprogs-1.41.90-wc3 or later, available at:</para>
- <para><link xl:href="http://downloads.whamcloud.com/public/e2fsprogs/latest/">http://downloads.whamcloud.com/public/e2fsprogs/latest/</link></para>
- </listitem>
- <listitem>
- <para>If you want to add optional packages to your Lustre system, install them now.</para>
- </listitem>
- </orderedlist>
+ <para>Clients to be upgraded to the Lustre software release 2.4 or
+ higher must be running a compatible Linux distribution. See the Linux
+ Test Matrix at
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="LustreTestMatrixTable" />for a list of tested Linux
+ distributions.</para>
</listitem>
+ </itemizedlist>
+ </para>
+ <para>
+ <emphasis role="italic">
+ <emphasis role="bold">Lustre software release 2.x.y release (minor)
+ upgrade:</emphasis>
+ </emphasis>
+ </para>
+ <itemizedlist>
+ <listitem>
+ <para>All servers must be upgraded at the same time, while some or all
+ clients may be upgraded.</para>
+ </listitem>
+ <listitem>
+ <para>Rolling upgrades are supported for minor releases allowing
+ individual servers and clients to be upgraded without stopping the
+ Lustre file system.</para>
+ </listitem>
+ </itemizedlist>
+ </section>
+ <section xml:id="Upgrading_2.x">
+ <title>
+ <indexterm>
+ <primary>upgrading</primary>
+ <secondary>major release (2.x to 2.x)</secondary>
+ </indexterm>
+ <indexterm>
+ <primary>wide striping</primary>
+ </indexterm>
+ <indexterm>
+ <primary>MDT</primary>
+ <secondary>multiple MDSs</secondary>
+ </indexterm>
+ <indexterm>
+ <primary>large_xattr</primary>
+ <secondary>ea_inode</secondary>
+ </indexterm>
+ <indexterm>
+ <primary>wide striping</primary>
+ <secondary>large_xattr</secondary>
+ <tertiary>ea_inode</tertiary>
+ </indexterm>Upgrading to Lustre Software Release 2.x (Major
+ Release)</title>
+ <para>The procedure for upgrading from a Lustre software release 2.x to a
+ more recent 2.x release of the Lustre software is described in this
+ section.</para>
+ <note>
+ <para>This procedure can also be used to upgrade Lustre software release
+ 1.8.6-wc1 or later to any Lustre software release 2.x. To upgrade other
+ versions of Lustre software release 1.8.x, contact your support
+ provider.</para>
+ </note>
+ <note>
+ <para condition="l22">In Lustre software release 2.2, a feature has been
+ added that allows striping across up to 2000 OSTs. By default, this "wide
+ striping" feature is disabled. It is activated by setting the
+ <literal>large_xattr</literal> or
+ <literal>ea_inode</literal> option on the MDT using either
+ <literal>mkfs.lustre</literal> or
+ <literal>tune2fs</literal>. For example after upgrading an existing file
+ system to Lustre software release 2.2 or later, wide striping can be
+ enabled by running the following command on the MDT device before
+ mounting it:
+ <screen>tune2fs -O large_xattr</screen>
+ Once the wide striping feature is enabled and in use on the MDT, it is
+ not possible to directly downgrade the MDT file system to an earlier
+ version of the Lustre software that does not support wide striping. To
+ disable wide striping:
+ <orderedlist>
<listitem>
- <para>Shut down the file system.</para>
- <para>Shut down the components in this order: clients, then the MDT, then OSTs. Unmounting a block device causes Lustre to be shut down on that node.</para>
- <orderedlist>
- <listitem>
- <para>Unmount the clients. On each client node, run:</para>
- <screen>umount -a -t lustre</screen>
- </listitem>
- <listitem>
- <para>Unmount the MDT. On the MDS node, run:</para>
- <screen>umount -a -t lustre</screen>
- </listitem>
- <listitem>
- <para>Unmount the OSTs (be sure to unmount all OSTs). On each OSS node, run:</para>
- <screen>umount -a -t lustre</screen>
- </listitem>
- </orderedlist>
+ <para>Delete all wide-striped files.</para>
+ <para>OR</para>
+ <para>Use
+ <literal>lfs_migrate</literal> with the option
+ <literal>-c</literal>
+ <replaceable>stripe_count</replaceable>(set
+ <replaceable>stripe_count</replaceable>to 160) to move the files to
+ another location.</para>
</listitem>
<listitem>
- <para>Since the kernel will typically be upgraded with a 1.8 to 2.x upgrade, the nodes will need to be rebooted in order to use the new kernel.</para>
+ <para>Unmount the MDT.</para>
</listitem>
<listitem>
- <para>Start the upgraded file system.</para>
- <para>Start the components in this order: OSTs, then the MDT, then clients.</para>
- <orderedlist>
- <listitem>
- <para>Mount the OSTs (be sure to mount all OSTs). On each OSS node, run:</para>
- <screen>oss# mount -a -t lustre</screen>
- <para>This command assumes that all OSTs are listed in the /etc/fstab file. If the OSTs are not in the /etc/fstab file, they need to be mounted individually by running the mount command:</para>
- <screen>oss# mount -t lustre <replaceable>/dev/block_device</replaceable> <replaceable>/mount_point</replaceable> </screen>
- </listitem>
- <listitem>
- <para>Mount the MDT. On the MDS node, run:</para>
- <screen>mds# mount -a -t lustre</screen>
- </listitem>
- <listitem>
- <para>Mount the file system on the clients. On each client node, run:</para>
- <screen>client# mount -a -t lustre</screen>
- </listitem>
- </orderedlist>
+ <para>Run the following command to turn off the
+ <literal>large_xattr</literal> option:
+ <screen>tune2fs -O ^large_xattr</screen></para>
</listitem>
- </orderedlist>
- <para>If you have a problem upgrading Lustre, use the <link xl:href="https://groups.google.com/a/whamcloud.com/group/wc-discuss/">wc-discuss</link> mailing list, or file a ticket at the <link xl:href="https://bugs.whamcloud.com">Intel Lustre</link> bug tracker.</para>
- </section>
+ </orderedlist>Using either
+ <literal>mkfs.lustre</literal> or
+ <literal>tune2fs</literal> with
+ <literal>large_xattr</literal> or
+ <literal>ea_inode</literal> option reseults in
+ <literal>ea_inode</literal> in the file system feature list.</para>
+ </note>
+ <note condition="l23">
+ <para>To generate a list of all files with more than 160 stripes use
+ <literal>lfs find</literal> with the
+ <literal>--stripe-count</literal> option:
+ <screen>lfs find ${mountpoint} --stripe-count=+160</screen></para>
+ </note>
+ <note condition="l24">
+ <para>In Lustre software release 2.4, a new feature allows using multiple
+ MDTs, which can each serve one or more remote sub-directories in the file
+ system. The
+ <literal>root</literal> directory is always located on MDT0.</para>
+ <para>Note that clients running a release prior to the Lustre software
+ release 2.4 can only see the namespace hosted by MDT0 and will return an
+ IO error if an attempt is made to access a directory on another
+ MDT.</para>
+ </note>
+ <para>To upgrade a Lustre software release 2.x to a more recent major
+ release, complete these steps:</para>
+ <orderedlist>
+ <listitem>
+ <para>Create a complete, restorable file system backup.</para>
+ <caution>
+ <para>Before installing the Lustre software, back up ALL data. The
+ Lustre software contains kernel modifications that interact with
+ storage devices and may introduce security issues and data loss if
+ not installed, configured, or administered properly. If a full backup
+ of the file system is not practical, a device-level backup of the MDT
+ file system is recommended. See
+ <xref linkend="backupandrestore" />for a procedure.</para>
+ </caution>
+ </listitem>
+ <listitem>
+ <para>Shut down the file system by unmounting all clients and servers
+ in the order shown below (unmounting a block device causes the Lustre
+ software to be shut down on that node):</para>
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Unmount the clients. On each client node, run:</para>
+ <screen>umount -a -t lustre</screen>
+ </listitem>
+ <listitem>
+ <para>Unmount the MDT. On the MDS node, run:</para>
+ <screen>umount -a -t lustre</screen>
+ </listitem>
+ <listitem>
+ <para>Unmount all the OSTs. On each OSS node, run:</para>
+ <screen>umount -a -t lustre</screen>
+ </listitem>
+ </orderedlist>
+ </listitem>
+ <listitem>
+ <para>Upgrade the Linux operating system on all servers to a compatible
+ (tested) Linux distribution and reboot. See the Linux Test Matrix at
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="LustreTestMatrixTable" />.</para>
+ </listitem>
+ <listitem>
+ <para>Upgrade the Linux operating system on all clients to Red Hat
+ Enterprise Linux 6 or other compatible (tested) distribution and
+ reboot. See the Linux Test Matrix at
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="LustreTestMatrixTable" />.</para>
+ </listitem>
+ <listitem>
+ <para>Download the Lustre server RPMs for your platform from the
+ <link xl:href="https://wiki.hpdd.intel.com/display/PUB/Lustre+Releases">
+ Lustre Releases</link>repository. See
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="table_cnh_5m3_gk" />for a list of required packages.</para>
+ </listitem>
+ <listitem>
+ <para>Install the Lustre server packages on all Lustre servers (MGS,
+ MDSs, and OSSs).</para>
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Log onto a Lustre server as the
+ <literal>root</literal> user</para>
+ </listitem>
+ <listitem>
+ <para>Use the
+ <literal>yum</literal> command to install the packages:</para>
+ <para>
+ <screen># yum --nogpgcheck install pkg1.rpm pkg2.rpm ... </screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Verify the packages are installed correctly:</para>
+ <para>
+ <screen>rpm -qa|egrep "lustre|wc"</screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Repeat these steps on each Lustre server.</para>
+ </listitem>
+ </orderedlist>
+ </listitem>
+ <listitem>
+ <para>Download the Lustre client RPMs for your platform from the
+ <link xl:href="https://wiki.hpdd.intel.com/display/PUB/Lustre+Releases">
+ Lustre Releases</link>repository. See
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="table_j3r_ym3_gk" />for a list of required packages.</para>
+ <note>
+ <para>The version of the kernel running on a Lustre client must be
+ the same as the version of the
+ <literal>lustre-client-modules-</literal>
+ <replaceable>ver</replaceable>package being installed. If not, a
+ compatible kernel must be installed on the client before the Lustre
+ client packages are installed.</para>
+ </note>
+ </listitem>
+ <listitem>
+ <para>Install the Lustre client packages on each of the Lustre clients
+ to be upgraded.</para>
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Log onto a Lustre client as the
+ <literal>root</literal> user.</para>
+ </listitem>
+ <listitem>
+ <para>Use the
+ <literal>yum</literal> command to install the packages:</para>
+ <para>
+ <screen># yum --nogpgcheck install pkg1.rpm pkg2.rpm ... </screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Verify the packages were installed correctly:</para>
+ <para>
+ <screen># rpm -qa|egrep "lustre|kernel"</screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Repeat these steps on each Lustre client.</para>
+ </listitem>
+ </orderedlist>
+ </listitem>
+ <listitem>
+ <para>(Optional) For upgrades to Lustre software release 2.2 or higher,
+ to enable wide striping on an existing MDT, run the following command
+ on the MDT :
+ <screen>mdt# tune2fs -O large_xattr <replaceable>device</replaceable></screen></para>
+ <para>For more information about wide striping, see
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="section_syy_gcl_qk" />.</para>
+ </listitem>
+ <listitem>
+ <para>(Optional) For upgrades to Lustre software release 2.4 or higher,
+ to format an additional MDT, complete these steps:
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Determine the index used for the first MDT (each MDT must
+ have unique index). Enter:
+ <screen>client$ lctl dl | grep mdc
+36 UP mdc lustre-MDT0000-mdc-ffff88004edf3c00
+ 4c8be054-144f-9359-b063-8477566eb84e 5</screen></para>
+ <para>In this example, the next available index is 1.</para>
+ </listitem>
+ <listitem>
+ <para>Add the new block device as a new MDT at the next available
+ index by entering (on one line):
+ <screen>mds# mkfs.lustre --reformat --fsname=<replaceable>filesystem_name</replaceable> --mdt \
+ --mgsnode=<replaceable>mgsnode</replaceable> --index <replaceable>1</replaceable>
+<replaceable>/dev/mdt1_device</replaceable></screen></para>
+ </listitem>
+ </orderedlist></para>
+ </listitem>
+ <listitem>
+ <para>(Optional) If you are upgrading to Lustre software release 2.3 or
+ higher from Lustre software release 2.2 or earlier and want to enable
+ the quota feature, complete these steps:
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Before setting up the file system, enter on both the MDS and
+ OSTs:
+ <screen>tunefs.lustre --quota</screen></para>
+ </listitem>
+ <listitem>
+ <para>When setting up the file system, enter:
+ <screen>conf_param $FSNAME.quota.mdt=$QUOTA_TYPE
+conf_param $FSNAME.quota.ost=$QUOTA_TYPE</screen></para>
+ </listitem>
+ </orderedlist></para>
+ </listitem>
+ <listitem>
+ <para>(Optional) If you are upgrading from Lustre software release 1.8,
+ you must manually enable the FID-in-dirent feature. On the MDS, enter:
+ <screen>tune2fs –O dirdata /dev/<replaceable>mdtdev</replaceable></screen></para>
+ <warning>
+ <para>This step is not reversible. Do not complete this step until
+ you are sure you will not be downgrading the Lustre software.</para>
+ </warning>
+ <para condition='l24'>This step only enables FID-in-dirent for newly
+ created files. If you are upgrading to Lustre software release 2.4,
+ you can use LFSCK to enable FID-in-dirent for existing files. For
+ more information about FID-in-dirent and related functionalities in
+ LFSCK, see <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="understandinglustre.storageio" />.</para>
+ </listitem>
+ <listitem>
+ <para>Start the Lustre file system by starting the components in the
+ order shown in the following steps:</para>
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Mount the MGT. On the MGS, run
+ <screen>mgs# mount -a -t lustre</screen></para>
+ </listitem>
+ <listitem>
+ <para>Mount the MDT(s). On each MDT, run:
+ <screen>mds# mount -a -t lustre</screen></para>
+ </listitem>
+ <listitem>
+ <para>Mount all the OSTs. On each OSS node, run:</para>
+ <screen>oss# mount -a -t lustre</screen>
+ <note>
+ <para>This command assumes that all the OSTs are listed in the
+ <literal>/etc/fstab</literal> file. OSTs that are not listed in
+ the
+ <literal>/etc/fstab</literal> file, must be mounted individually
+ by running the mount command:</para>
+ <screen>mount -t lustre <replaceable>/dev/block_device</replaceable><replaceable>/mount_point</replaceable></screen>
+ </note>
+ </listitem>
+ <listitem>
+ <para>Mount the file system on the clients. On each client node,
+ run:</para>
+ <screen>client# mount -a -t lustre</screen>
+ </listitem>
+ </orderedlist>
+ </listitem>
+ </orderedlist>
+ <note>
+ <para>The mounting order described in the steps above must be followed
+ for the intial mount and registration of a Lustre file system after an
+ upgrade. For a normal start of a Lustre file system, the mounting order
+ is MGT, OSTs, MDT(s), clients.</para>
+ </note>
+ <para>If you have a problem upgrading a Lustre file system, see
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="dbdoclet.50438198_30989" />for some ways to get help.</para>
</section>
- <section xml:id='dbdoclet.upgradetodne' condition='l24'>
- <title><indexterm><primary>upgrading</primary><secondary>multiple metadata targets</secondary></indexterm>Upgrading to multiple metadata targets</title>
- <para>Lustre 2.4 allows separate metadata servers to serve separate sub directories. To upgrade a filesystem to Lustre 2.4 that support multiple metadata servers:</para>
- <orderedlist>
- <listitem>
- <para>Stop MGT/MDT/OST and upgrade to 2.4</para>
- </listitem>
- <listitem>
- <para>Format new MDT according to <xref linkend="dbdoclet.addingamdt"/>.</para>
- </listitem>
- <listitem>
- <para>Mount all of the targets according to <xref linkend="dbdoclet.addingamdt"/>.</para>
- </listitem>
- <listitem>
- <para>After recovery is completed clients will be connected MDT0.</para>
- <note><para>Clients prior to 2.4 will only be have the namespace provided by MDT0 visible and will return an IO error if a directory hosted on a remote MDT is accessed.</para></note>
- </listitem>
- </orderedlist>
+ <section xml:id="Upgrading_2.x.x">
+ <title>
+ <indexterm>
+ <primary>upgrading</primary>
+ <secondary>2.X.y to 2.X.y (minor release)</secondary>
+ </indexterm>Upgrading to Lustre Software Release 2.x.y (Minor
+ Release)</title>
+ <para>Rolling upgrades are supported for upgrading from any Lustre software
+ release 2.x.y to a more recent Lustre software release 2.X.y. This allows
+ the Lustre file system to continue to run while individual servers (or
+ their failover partners) and clients are upgraded one at a time. The
+ procedure for upgrading a Lustre software release 2.x.y to a more recent
+ minor release is described in this section.</para>
+ <para>To upgrade Lustre software release 2.x.y to a more recent minor
+ release, complete these steps:</para>
+ <orderedlist>
+ <listitem>
+ <para>Create a complete, restorable file system backup.</para>
+ <caution>
+ <para>Before installing the Lustre software, back up ALL data. The
+ Lustre software contains kernel modifications that interact with
+ storage devices and may introduce security issues and data loss if
+ not installed, configured, or administered properly. If a full backup
+ of the file system is not practical, a device-level backup of the MDT
+ file system is recommended. See
+ <xref linkend="backupandrestore" />for a procedure.</para>
+ </caution>
+ </listitem>
+ <listitem>
+ <para>Download the Lustre server RPMs for your platform from the
+ <link xl:href="https://wiki.hpdd.intel.com/display/PUB/Lustre+Releases">
+ Lustre Releases</link>repository. See
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="table_cnh_5m3_gk" />for a list of required packages.</para>
+ </listitem>
+ <listitem>
+ <para>For a rolling upgrade, complete any procedures required to keep
+ the Lustre file system running while the server to be upgraded is
+ offline, such as failing over a primary server to its secondary
+ partner.</para>
+ </listitem>
+ <listitem>
+ <para>Unmount the Lustre server to be upgraded (MGS, MDS, or
+ OSS)</para>
+ </listitem>
+ <listitem>
+ <para>Install the Lustre server packages on the Lustre server.</para>
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Log onto the Lustre server as the
+ <literal>root</literal> user</para>
+ </listitem>
+ <listitem>
+ <para>Use the
+ <literal>yum</literal> command to install the packages:</para>
+ <para>
+ <screen># yum --nogpgcheck install pkg1.rpm pkg2.rpm ... </screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Verify the packages are installed correctly:</para>
+ <para>
+ <screen>rpm -qa|egrep "lustre|wc"</screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Mount the Lustre server to restart the Lustre software on the
+ server:
+ <screen>server# mount -a -t lustre</screen></para>
+ </listitem>
+ <listitem>
+ <para>Repeat these steps on each Lustre server.</para>
+ </listitem>
+ </orderedlist>
+ </listitem>
+ <listitem>
+ <para>Download the Lustre client RPMs for your platform from the
+ <link xl:href="https://wiki.hpdd.intel.com/display/PUB/Lustre+Releases">
+ Lustre Releases</link>repository. See
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="table_j3r_ym3_gk" />for a list of required packages.</para>
+ </listitem>
+ <listitem>
+ <para>Install the Lustre client packages on each of the Lustre clients
+ to be upgraded.</para>
+ <orderedlist numeration="loweralpha">
+ <listitem>
+ <para>Log onto a Lustre client as the
+ <literal>root</literal> user.</para>
+ </listitem>
+ <listitem>
+ <para>Use the
+ <literal>yum</literal> command to install the packages:</para>
+ <para>
+ <screen># yum --nogpgcheck install pkg1.rpm pkg2.rpm ... </screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Verify the packages were installed correctly:</para>
+ <para>
+ <screen># rpm -qa|egrep "lustre|kernel"</screen>
+ </para>
+ </listitem>
+ <listitem>
+ <para>Mount the Lustre client to restart the Lustre software on the
+ client:
+ <screen>client# mount -a -t lustre</screen></para>
+ </listitem>
+ <listitem>
+ <para>Repeat these steps on each Lustre client.</para>
+ </listitem>
+ </orderedlist>
+ </listitem>
+ </orderedlist>
+ <para>If you have a problem upgrading a Lustre file system, see
+ <xref xmlns:xlink="http://www.w3.org/1999/xlink"
+ linkend="dbdoclet.50438198_30989" />for some suggestions for how to get
+ help.</para>
</section>
</chapter>
git://git.whamcloud.com / doc / manual.git / blobdiff