Symantec Drive Encryption (previously PGP Whole Disk Encryption) Encryption and Decryption processes can be paused. In certain cases, pausing the encryption or decryption process may not be desired. Pausing during encryption or decryption processes is controlled via the Consumer Policy in PGP Universal Server under Disk Encryption section.
In the Disk Encryption section of Consumer Policy on Universal Server, if the box "Allow Encryption" is checked for PGP Whole Disk Encryption, then it will be possible to pause during encryption process.
*Note: There were some issues with systems inadvertently pausing when it wasn't allowed in versions PGP WDE 10.2 through 10.2.1. This issue has been resolved in 3.2.1 MP1/10.2.1 MP1 and above (etrack 2586361).