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Upgrading to a New Version of Lustre

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Use the procedures in this chapter to upgrade Lustre 1.6.x to Lustre 1.8.0.

Note: In Lustre version 1.6 and later, the file system name (--fsname parameter) is limited to 8 characters so that it fits on the disk label.

Supported Upgrade and Downgrade Paths

For Lustre 1.8.x, the following upgrades are supported:

  • Lustre 1.6.x to Lustre 1.8.0.
  • One minor version to the next (for example, 1.8.0 > 1.8.x).

For Lustre 1.8.0, downgrades in the same ranges are supported.

  • If you upgrade from Lustre 1.6.x > 1.8.0, you can downgrade to version 1.6.x.
  • If you upgrade from one minor version to the next (for example Lustre 1.8.0 > 1.8.x), you can downgrade to an earlier minor version (e.g., version 1.8.x). Is this correctly stated?

Caution: A fresh installation of Lustre 1.8.x is not guaranteed to be downgradable to an earlier Lustre version.

For supported upgrade paths for earlier releases, see Upgrading from 1.4.6 and later to 1.6.

Prerequisites to Upgrading Lustre

Are these procedures that must be completed before the upgrade is started? Do they apply to any upgrade path?

Remember the following points before upgrading Lustre.

The MDT must be upgraded before the OSTs are upgraded. 1. Shut down lconf failover. 2. Install the new modules. 3. Run tunefs.lustre. 4. Mount startup.

A Lustre upgrade can be done across a failover pair. 1. On the backup server, install the new modules. 2. Shut down lconf failover. 3. On the new server, run tunefs.lustre. 4. On the new server, mount startup. 5. On the primary server, install the new modules.

Upgrade procedures

Which should be included here and which referred to in the manual?

Upgrading from Lustre 1.6.x to Lustre 1.8.0

  • Prerequisites to Upgrading Lustre
  • Starting Clients
  • Upgrading a Single File System
  • Upgrading Multiple File Systems with a Shared MGS

Upgrading Lustre 1.8.0 to the Next Minor Version

Downgrading from Lustre 1.8.0 to Lustre 1.6.x

  • Downgrade Requirements
  • Downgrading a File System




Lustre Failover and Rolling Upgrades in OM.

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