Supported Upgrade Paths - Hitless

For all platforms, the OCCSM supports the following hitless upgrade and rollback paths:

• S-CZ8.2.5 to S-CZ8.4.5

Supported Upgrade Paths - Non-Hitless

For VMWare and KVM and XEN platforms, the OCCSM supports the following non-hitless upgrade and rollback paths:

• S-CZ7.3.5 to S-CZ8.4.5

You cannot upgrade these virtual machines from S-CZ7.3.5 release to S-CZ8.4.5 because the platform code does not support an in-place upgrade of a virtual machine hard disk from one OS version to another. This is due to bootloader support, as follows:

• 7.x is based on OL6 and uses the grub bootloader
• 8.x is based on OL7 and uses the grub2 bootloader

Follow these steps to perform these non-hitless upgrades:

1. Stop the standby node
2. Deploy a new 8.x based virtual machine as standby.
3. Configure the original standby IP and machine name to be the same as the former standby in the boot parameters.
4. Set licenses and entitlements to be the same as the former standby.
5. Perform an acquire-config from the active 7.x based node.
6. Once it is in sync, fail over and repeat for the other VM.