After running out of space on the scratch disk, the scratch disk is extended. However, the available space shown by the Linux df command is unchanged.
When a virtual appliance scratch disk is enlarged, the usable space is unchanged because the file system is not extended to fill the available space. If you replace the scratch disk with a larger disk, the file system will fill the disk, but the old contents are lost so the the VM disks must be rehashed before they can replicate.
This is simply the result of creating a file system first and then extending the disk.
Switch off the VA and set the new size on the scratch disk.
After setting a new size for the scratch disk, power on the VA and log in with the root account.
Enter the command resize2fs /dev/sdb
The file system will be extended to fill the disk and the contents of the file system will be retained.
Execute the command 'df -h'. The new scratch disk size will be displayed correctly.
When finished, reboot the VA.