06-14-2013 02:59 PM
Does anyone have a walk through on enabling tape drive compression(NOT software compression)? I've been doing some research and it appears commands such as: sdparm - <device>, and sginfo -a displays the following information:
Solved! Go to Solution.
06-15-2013 10:23 AM
A LTO tape drive will always compress the data. The native capacity of LTO6 is 2.5TB per and you are seeing 3.1 TB per tape so the tape drive do compress data.
The 6.25TB per tape is based on a compression ration of 2.5:1.
See : http://www.tapeandmedia.com/lto-6-tape-media-tapes.asp
06-15-2013 10:23 AM
A LTO tape drive will always compress the data. The native capacity of LTO6 is 2.5TB per and you are seeing 3.1 TB per tape so the tape drive do compress data.
The 6.25TB per tape is based on a compression ration of 2.5:1.
See : http://www.tapeandmedia.com/lto-6-tape-media-tapes.asp
06-15-2013 02:43 PM
06-15-2013 11:29 PM
are you backing up the same data to both tapes?
as nicolai write, tape compression is always enabled. try to do a test.
Create a new policy and add a big client to the policy. Be sour that the client files are compressible (no photos).
Point the storage unit to the LTO4 drives. Use a new volume pool.
start the policy several time until the tape is full.
Do the same with an LTO6 volume pool.
Then compare both tapes.
06-15-2013 11:34 PM
06-16-2013 12:45 AM
It all depends on compressibility of your data. Some compress better than others.
I believe that Nicolai has answered your question - no need to enable compression, it is enabled by default.
06-16-2013 12:50 AM
06-16-2013 01:05 AM
Please remember to mark Nicolai's post as Solution.