KenRawlings: added Lustre Configuration Example from old wiki as part of migration

2016-08-25T14:27:15Z

added Lustre Configuration Example from old wiki as part of migration

KenRawlings: Initial creation as part of accelerated wiki migration

2016-08-10T15:52:42Z

Initial creation as part of accelerated wiki migration

New page

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!Note: This page originated on the old Lustre wiki. It was identified as likely having value and was migrated to the new wiki. It is in the process of being reviewed/updated and may currently have content that is out of date.
|}

<small>''(Updated: Sep 2009)''</small>
__TOC__
This page describes how to configure a simple Lustre™ file system comprised of a combined MGS/MDT, an OST and a client. The administrative utilities provided with Lustre, however, can be used to set up systems with many different configurations.

'''''Note:''''' We recommend that you use dotted-quad (dot-decimal) notation for IP
addresses (IPv4) rather than host names. This aids in reading debug logs and helps
when debugging configurations with multiple interfaces.

== Configuring the Lustre File System ==
This section contains a procedure for configuring the Lustre File System. For an example showing configuration of a Lustre installation comprising a combined MGS/MDT, an OST and a client see the [[Lustre Configuration Example]].

To configure Lustre Networking (LNET) and the Lustre file
system, complete these steps:

1. ''Define the module options for Lustre networking (LNET)'' by adding this line
to the ''/etc/modprobe.conf'' file. The ''modprobe.conf'' file is a Linux file that specifies which parts of the kernel are loaded.

:<pre>options lnet networks=<network interfaces that LNET can use></pre>

:This step restricts LNET to using only the specified network interfaces and prevents LNET from using all network interfaces.

:As an alternative to modifying the ''modprobe.conf'' file, you can modify the ''modprobe.local'' file or the configuration files in the ''modprobe.d'' directory.

:'''''Note:''''' For details on configuring networking and LNET, see [http://wiki.lustre.org/manual/LustreManual20_HTML/UnderstandingLustreNetworking.html#50438191_pgfId-1289854 Chapter 2: ''Understanding Lustre Networking (LNET'')] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].

2. ''(Optional) Prepare the block devices to be used as OSTs or MDTs.'' Depending on the hardware used in the MDS and OSS nodes, you may want to set up a hardware or software RAID to increase the reliability of the Lustre system. For more details on how to set up a hardware or software RAID, see the documentation for your RAID controller or see [http://wiki.lustre.org/manual/LustreManual20_HTML/ConfiguringStorage.html#50438208_pgfId-1289851 Chapter 6: ''Configuring Storage on a Lustre File System''] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].

3. ''Create a combined MGS/MDT file system on the block device.'' On the MDS
node, run:

:<pre>mkfs.lustre --fsname=<fsname> --mgs --mdt <block device name>
</pre>

:The default file system name (''fsname'') is ''lustre''.

:'''''Note:''''' If you plan to generate multiple file systems, the MGS should be on its own dedicated block device.

4. ''Mount the combined MGS/MDT file system on the block device.'' On the MDS
node, run:
:<pre>mount -t lustre <block device name> <mount point>
</pre>

5. ''Create the OST.'' On the OSS node, run:

:<pre>mkfs.lustre --ost --fsname=<fsname> --mgsnode=<NID> <block device name>
</pre>

:You can have as many OSTs per OSS as the hardware or drivers allow.

:You should use only one OST per block device. Optionally, you can create an OST which uses the raw block device and does not require partitioning.

:'''''Note:''''' If the block device has more than 8 TB of storage, it must be partitioned due to the ext3 file system limitation. Lustre can support block devices with multiple partitions, but they are not recommended because bottlenecks may result.

6. ''Mount the OST.'' On the OSS node where the OST was created, run:

:<pre>mount -t lustre <block device name> <mount point>
</pre>

:'''''Note:''''' ''To create additional OSTs, repeat Steps 5 and 6.''

7. ''Create the client (mount the file system on the client).'' On the client node, run:

:<pre>
;mount -t lustre <MGS node>:/<fsname> <mount point>
</pre>

:'''''Note:''''' To create additional clients, repeat Step 7]].

8. ''Verify that the file system started and is working'' by running the UNIX
commands ''df'', ''dd'' and ''ls'' on the client node.

:a. ''Run the ''df'' command.''

:<pre>
;[root@client1 /] df -h
</pre>

:b. ''Run the ''dd'' command.''

:<pre>
;[root@client1 /] cd /lustre
;[root@client1 /lustre] dd if=/dev/zero of=/lustre/zero.dat bs=4M count=2
</pre>

c. ''Run the ''ls'' command.''

:<pre>
;[root@client1 /lustre] ls -lsah
</pre>

If you have a problem mounting the file system, check the syslogs for errors.

== Lustre Configuration Example ==

For an example illustrating the configuration steps described in the previous section for
a Lustre installation comprising a combined MGS/MDT, an OST and a client, see [[Lustre Configuration Example]].

== Lustre Configuration Utilities ==

Once the Lustre file system is configured, it is ready for use. If additional configuration is necessary, see [[Lustre System Configuration Utilities]].

Configuring the Lustre File System - Revision history

KenRawlings: added Lustre Configuration Example from old wiki as part of migration

KenRawlings: Initial creation as part of accelerated wiki migration