[Bacula-users] Enable LTO-4 Hardware compression on bacula.
2014-11-26 09:46:14
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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