After compression is enabled for an NSS volume, you cannot deselect the Compression attribute check box to turn off compression. Use one of the following methods to disable compression for a volume.
To effectively stop compression for a volume, set the Days Untouched Before Compression parameter’s elapsed time to the maximum value. Eventually, files are decompressed as they are used and remain uncompressed because they never cross the threshold for inactivity.
Restore the data to an uncompressed volume. For information, see Section 21.6, Restoring Data to a Uncompressed Volume.
Set Enable File Compression to Off. Eventually, files are decompressed as they are used and remain uncompressed.