Hi, first of all i'm sorry for my english.

I post here because i'm not able to enable Hardware compression on my LTO-4 
tape.

I was reading a lot of forums with info about how to enable, but tape still 
without compression.
My tape drive is a 
[url=http://www.quantum.com/serviceandsupport/softwareanddocumentationdownloads/lto-4hh/index.aspx]Quantum
 Ultrium LTO-4 HH Original[/ur] and is able to HW compress data.

Here's the report of some utilities:

tapeinfo -f /dev/st0
Product Type: Tape Drive
Vendor ID: 'QUANTUM '
Product ID: 'ULTRIUM 4       '
Revision: '2170'
Attached Changer API: No
SerialNumber: 'PW0752AMJ50072'
MinBlock: 1
MaxBlock: 16777215
SCSI ID: 4
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x46
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
Block Position: 0
Partition 0 Remaining Kbytes: 0
Partition 0 Size in Kbytes: 852950
ActivePartition: 0
EarlyWarningSize: 0

---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------

tapeinfo -f /dev/nst0
Product Type: Tape Drive
Vendor ID: 'QUANTUM '
Product ID: 'ULTRIUM 4       '
Revision: '2170'
Attached Changer API: No
SerialNumber: 'PW0752AMJ50072'
MinBlock: 1
MaxBlock: 16777215
SCSI ID: 4
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x46
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
BOP: yes
Block Position: 0
Partition 0 Remaining Kbytes: 0
Partition 0 Size in Kbytes: 852950
ActivePartition: 0
EarlyWarningSize: 0

---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------

cat /sys/class/scsi_tape/st0/default_compression 
1

---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------

cat /sys/class/scsi_tape/nst0/default_compression 
1

---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------

It looks activated but i'm not able to use it... bacula still using only 800GB 
of tape. I know that it depends of compression ratio of stored files, but if 
gzip gets about 26% of CR, HW must get at least 10% of CR...

PDTA: All compressions in bacula are disabled

Thanks!!

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