Hello, list!

Bacula veriosn 5.0.0 for director, SD and FDs running in Linux hosts.

I've been reading the list archive searching for 'hardware compression' posts, 
because I need to find a way to confirm that the backups are really being 
compressed. 

Before using `mt' command, I had this: 
# cat  /sys/class/scsi_tape/nst0/default_compression
-1

Then:
# mt -f /dev/nst0 defcompression 1

and then:
# cat  /sys/class/scsi_tape/nst0/default_compression
1


Even before issuing that `mt' command, the Tape Drive reported Compression is 
enabled (see below).

Here is a volume info:
*list volume=Axxxx
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
| mediaid | volumename | volstatus | enabled | volbytes        | volfiles | 
volretention | recycle | slot | inchanger | mediatype | lastwritten         |
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
|      20 | Axxxx      | Append    |       1 | 603,938,958,336 |      645 |     
 432,000 |       1 |    5 |         1 | LTO-6     | 2024-10-24 09:02:55 |
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+

Using LTO-6 tapes, can I assume 603,9 gigabytes is stored being 
(hardware)compressed?



tapeinfo output:
# tapeinfo -f /dev/sg1
Product Type: Tape Drive
Vendor ID: 'IBM     '
Product ID: 'ULT3580-HH6     '
Revision: 'E6R3'
Attached Changer API: No
SerialNumber: '10WT067593'
TapeAlert[10]:    No Removal: Cannot unload, initiator is preventing media 
removal.
MinBlock: 1
MaxBlock: 8388608
SCSI ID: 0
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: 0x68
Density Code: 0x5a
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0xff
DeCompType: 0xff
Block Position: 1
Partition 0 Remaining Kbytes: -1
Partition 0 Size in Kbytes: -1
ActivePartition: 0
EarlyWarningSize: 0
NumPartitions: 0
MaxPartitions: 3


Regards,
-- 
Gabriel 


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