Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > Dell PowerScale: Non-Disruptive Upgrade Best Practices > Patch upgrade
This section focuses on the guideline and methodologies of troubleshooting patch upgrade issues.
Since patch system activity is asynchronous, you will drop back to the command prompt immediately after issuing a patch system request. You can monitor the status of the patch installation or uninstallation by using the following commands:
tme-sandbox-2# isi upgrade node list
tme-sandbox-2# isi upgrade cluster view
You can also use the following commands to view the detailed messages of the patch upgrade:
isi_upgrade_status
To collect the log bundles of patch upgrade, use the following command:
isi_upgrade_logs
It may be possible for a patch request to fail for some reasons. When this happens, both the patch system and the NDU framework will remain in use until either the patch request is completed or aborted. Both of these options can be completed using the following command:
tme-sandbox-2# isi upgrade retry-last-action all
tme-sandbox-2# isi upgrade retry-last-action 2,4,6
tme-sandbox-2# isi upgrade patches abort
Once this is completed, you can use the following command to archive and clean up the NDU status:
tme-sandbox-2# isi upgrade cluster archive --clear
Note: After the commands in option 2 have completed, the patch may still be installed on some nodes. This is likely if you were doing a rolling patch install and it failed in the middle. To uninstall from the remaining nodes, run a normal patch uninstall command: isi upgrade patches uninstall <patch name>.