6027-3588 [E] Aborting compression as the file is currently memory mapped, opened in direct I/O mode, or stored in a horizontal storage pool.
Explanation
Compression operation is not performed because it
is inefficient or unsafe to compress the file at this time.
User response
Compress this file after the file is no longer memory
mapped, opened in direct I/O mode, or stored in a horizontal storage
pool.