The L&TT support ticket contains drive configuration
information such as whether hardware data compression is enabled or not.
Use L&TT to pull the ticket then look in the
Drive->Drive Configuration section for details.
Here's an example:
||__ Data compression : Enabled
||__ Current block size : Not available
||__ Detect WORM tampering : WORM not supported
||__ Reads after WORM tampering : WORM not supported
||__ Media removal (software controlled) :
If data compression is not enabled then it is likely that
it has been turned off by the backup application. Check the options in your
application to ensure that software compression (done by the server) is turned
off and hardware compression (done by the drive) is turned on.
Data compression can be turned on in the drive by
The application ( the application will
usually override the drive configuration so configuring the application
correctly is of prime importance)
Resetting the drive
Power cycling the drive
Using the L&TT Set Drive Configuration utility (use
the options to enable compression -see the L&TT user guide
will turn off hardware compression in the drive at the end of each backup, so
when you look at it with Library and Tape Tools it will be off
. This is actually normal for NetBackup, so please check
the configuration of NetBackup to make sure that compression is configured
correctly. In this case see 'Measure Compression Ratio' (go back one level) as
that will show whether compression has been in operation in the drive.
Click here to download the free L&TT
) - this will also access the L&TT user guide
Use the L&TT FAQ to find out how to pull a
Click here for the L&TT FAQ.
) Look for
How do I generate a support ticket?
in the contents.