Considerations for upgrading software and firmware for multiple controllers

Before you use SANtricity Unified Manager to upgrade multiple storage arrays, review the key considerations as part of your planning.

Current versions

You can view the current SANtricity OS software versions from the Manage page of Unified Manager for each discovered storage array. The version is shown in the SANtricity OS Software column. The controller firmware and NVSRAM information is available in a pop-up dialog box when you click on the SANtricity OS version in each row.

Other components requiring upgrade

As part of the upgrade process, you might also need to upgrade the host's multipath/failover driver or the HBA driver so that the host can interact with the controllers correctly.

For compatibility information, refer to the NetApp Interoperability Matrix. Also, see the procedures in the Express Guides for your operating system. Express Guides are available from the E-Series Documentation Center.

Dual controllers

If a storage array contains two controllers and you have a multipath driver installed, the storage array can continue to process I/O while the upgrade occurs. During the upgrade, the following process occurs:

  1. Controller A fails over all its LUNs to controller B.
  2. Upgrade occurs on controller A.
  3. Controller A takes back its LUNs and all of controller B's LUNs.
  4. Upgrade occurs on controller B.

After the upgrade completes, you might need to manually redistribute volumes between the controllers to ensure volumes return to the correct owning controller.

Immediate or staged upgrade

You can activate the upgrade immediately or stage it for a later time. You might choose to activate later for these reasons:

To activate staged software, go to Support > Upgrade Center and click Activate in the area labeled SANtricity OS Controller Software upgrade.

Health check

A health check runs as part of the upgrade process, but you can also run a health check separately before you begin (go to Upgrade Center > Pre-Upgrade Health Check).

The health check assesses all storage system components to make sure that the upgrade can proceed. The following conditions might prevent the upgrade: