Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > Dell PowerScale: Non-Disruptive Upgrade Best Practices > Balanced Firmware Upgrade Recommendation
This recommendation which is also known as intermediate firmware upgrade is a balance between simultaneous and rolling firmware upgrade. It runs faster than a rolling upgrade but is less intrusive than a simultaneous firmware upgrade. The recommendation adheres to the following restrictions:
To check the power redundancy for all the PowerScale node in the cluster, use the following command:
isi_for_array isi_hw_status | grep "Power Supp"
The following example indicates that all four nodes in the PowerScale cluster have redundant power supplies.
hop-isi-n-4: Power Supplies OK
hop-isi-n-4: Power Supply Slot3-PS0 good
hop-isi-n-4: Power Supply Slot4-PS1 good
hop-isi-n-2: Power Supplies OK
hop-isi-n-2: Power Supply Slot1-PS0 good
hop-isi-n-2: Power Supply Slot2-PS1 good
hop-isi-n-3: Power Supplies OK
hop-isi-n-3: Power Supply Slot3-PS0 good
hop-isi-n-3: Power Supply Slot4-PS1 good
hop-isi-n-1: Power Supplies OK
hop-isi-n-1: Power Supply Slot1-PS0 good
hop-isi-n-1: Power Supply Slot2-PS1 good
This recommendation will ensure that there is minimal impact during the simultaneous upgrade process.