Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > Dell PowerScale: Non-Disruptive Upgrade Best Practices > Firmware upgrade
This section focuses on the guideline and methodologies of troubleshooting firmware upgrade issues.
For isi_upgrade_helper, the logs are located on the PowerScale node where the tool is run at /var/log/isi_upgrade_helper.log. It is recommended to add the --debug parameter for verbose log information.
To monitor the upgrade process, use the following command:
isi upgrade view
The behaviors are different between rolling firmware upgrade and simultaneous firmware upgrade. The details are: