HPE Nimble Storage HF Series Hardware Manual page 125

Determine the model and OS version running on the array, and the state of the controllers. See Check Array Model,
OS Version, and Operating State Using the GUI on page 59.
Note the slot number for each NIC or HBA.
Synchronous replication:
Synchronous replication, with or without HPE Peer Persistence, cannot be configured when the array models do
not match. Do not start the upgrade unless all arrays in the group are being upgraded to the same model.
Synchronous replication cannot be enabled until all arrays have been upgraded.
If volumes are configured with Peer Persistence, create a snapshot before starting the controller upgrade. Then,
disable automatic group switchover (ASO) and unconfigure the synchronous replication volume collections. After
upgrading the controllers, reenable ASO and reconfigure the synchronous replication volume collections.
Procedure
1. Prepare the existing controller for the upgrade.
a) Log in to the array using the CLI.
b) Determine whether the existing controller is in Standby mode.
ctrlr --list --array array_name
c) Halt the standby controller.
halt --array array_name --controller {A | B}
Example
NimbleOS $ halt --array array123 --controller A
2. Remove the existing Standby controller to be upgraded.
a) Label all cables to ensure proper recabling later, then remove them from the controller.
b) Pinch the controller release lever catch to release the controller release lever.
1 Controller release lever
2 Controller release lever catch
c) Using one hand to support the bottom of the controller, firmly pull the controller release lever with the other hand
until the controller slides out of the chassis. Then place the controller on a flat surface.
3 Thumbscrew - PCIe cage release
4 Thumbscrew - PCIe card release
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Upgrade Procedures 125