Upgrading OneFS

Two options are available for upgrading the OneFS operating system: a rolling upgrade or a simultaneous upgrade. Before upgrading OneFS software, a pre-upgrade check must be performed.

A rolling upgrade individually upgrades and restarts each node in the Isilon cluster sequentially. During a rolling upgrade, the cluster remains online and continues serving clients with no interruption in service, although some connection resets may occur on SMB clients. Rolling upgrades are performed sequentially by node number, so a rolling upgrade takes longer to complete than a simultaneous upgrade. The final node in the upgrade process is the node that you used to start the upgrade process.

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Rolling upgrades are not available for all clusters. For instructions on how to plan an upgrade, prepare the cluster for upgrade, and perform an upgrade of the operating system, see the OneFS Upgrades – Isilon Info Hub

A simultaneous upgrade installs the new operating system and restarts all nodes in the cluster at the same time. Simultaneous upgrades are faster than rolling upgrades but require a temporary interruption of service during the upgrade process. Your data is inaccessible during the time that it takes to complete the upgrade process.

Before beginning either a simultaneous or rolling upgrade, OneFS compares the current cluster and operating system with the new version to ensure that the cluster meets certain criteria, such as configuration compatibility (SMB, LDAP, SmartPools), disk availability, and the absence of critical cluster events. If upgrading puts the cluster at risk, OneFS warns you, provides information about the risks, and prompts you to confirm whether to continue the upgrade.

If the cluster does not meet the pre-upgrade criteria, the upgrade does not proceed, and the unsupported statuses are listed.

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We recommend that you run the optional pre-upgrade checks. Before starting an upgrade, OneFS checks that your cluster is healthy enough to complete the upgrade process. Some of the pre-upgrade checks are mandatory, and will be performed even if you choose to skip the optional checks. All pre-upgrade checks contribute to a safer upgrade.