LVM manager is not an option to utilize the additional disk space because the disk added exceeds the 2TB limit.
I worked with a CP SE this afternoon, and here's the answers/solution that we came up with:
1. With the current Linux kernel version we cannot configure log storage to utilize space on both the install disk and the additional disk that's greater than 2TB.
2. After completing the steps to create & mount the >2TB disk in sk61081, then we need to follow the steps in sk66003 to change path used to store the firewall log files using the symbolic link method.
Caution/Warning: If a software version upgrade is completed on this system, the /etc/fstab file will be overwritten and logs will be directed back to the default location. So after the version upgrade the mount & fstab steps in sk61081, and removal of the default directory and creation of the symbolic link steps in sk66003 will need to be recreated.