I have a Qualstar Tape library (RLS-87120) with three LTO7 tape drives. It is
connected to the backup server directly through Fiber Channel. I am running
bacula 7.4. I ran a test backup which completed successfully but I found that
the LTO-7 Tape was not used up to its full capacity of 6TB. It wrote 2.6TB and
marked the tape "FULL" then moved on to the next tape in the pool. I expected
the backup to write 6TB to the tape before marking it "FULL"? Here is the
information from my bacula-sd.conf:
Maximum File Size = 50G
Maximum Network Buffer Size = 65536
Maximum Block Size = 2097152
The MaxBlock: 8388608 is seen in the tapeinfo command on the tape drive0:
# tapeinfo -f /dev/tapedr0
Product Type: Tape Drive
Vendor ID: 'IBM '
Product ID: 'ULTRIUM-HH7 '
Revision: 'FA11'
Attached Changer API: No
SerialNumber: '10WT004131'
MinBlock: 1
MaxBlock: 8388608
SCSI ID: 0
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: 0x78
Density Code: 0x5c
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0xff
DeCompType: 0xff
BOP: yes
Block Position: 0
Partition 0 Remaining Kbytes: -1
Partition 0 Size in Kbytes: -1
ActivePartition: 0
EarlyWarningSize: 0
NumPartitions: 0
MaxPartitions: 3
I am not sure if the issue I am seeing with the tape not being used to its full
capacity is due to the "Max Block size" I have set? What is the recommended
setting for LTO-7? If anybody could share your knowledge about this I would
really appreciate it. I did some search on the internet and could not find any
useful information.
Thank you
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