You can’t resize a virtual disk after adding it to a Panorama virtual appliance running on a VMware ESXi server. Because the Panorama virtual appliance allows only one log storage location, you must replace the virtual disk to modify the log storage capacity.
You will lose the logs on the existing disk when you replace it. One way to preserve the logs is to set up a new Panorama virtual appliance for the new disk (see Set Up the Panorama Virtual Appliance) and maintain access to the Panorama containing the old disk for as long as you need its logs. A second way to preserve the logs is to copy them from the old disk to the new disk. Copying can take several hours, depending on how many logs the disk currently stores, and Panorama cannot collect logs during the process. Contact Palo Alto Networks Customer Support for instructions on how to copy logs between disks. A third way to preserve existing logs is to Configure Log Forwarding from Panorama to External Destinations before you replace the virtual disk.
Replace the Virtual Disk on an ESXi Server
Remove the old virtual disk. Access the VMware vSphere Client and select the Virtual Machines tab. Right-click the Panorama virtual appliance and select Power > Power Off. Right-click the Panorama virtual appliance and select Edit Settings. Select the virtual disk in the Hardware tab and click Remove. Select one of the Removal Options and click OK.
Add the new virtual disk. Add a Virtual Disk to Panorama on an ESXi Server. Panorama running on ESXi 5.5 and later versions supports a virtual disk of up to 8TB. Panorama running on an earlier ESXi version supports a virtual disk of up to 2TB. In the vSphere Client, right-click the Panorama virtual appliance and select Power > Power On. The reboot process might take several minutes and the message cache data unavailable will display.
Verify that the modified log storage capacity is correct. Log in to the Panorama virtual appliance. Select Panorama > Setup > Management and verify that the Logging and Reporting Settings section, Log Storage field, displays the modified log storage capacity accurately.

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