Re: [Bacula-users] LTO-7 tape drive settings in bacula 7.4.0

I understand using the Maximum File Size directive, but the other two are unnecessary (documentation even says this) and is most likely causing your issues. A lot of these directives came about with older technologies in the tape arena and should not be used. You should read up on LTO from the consortium (lto.org) and on wikipedia. There’s a lot of good info on the how and why of LTO.

Patti

From: "Rao, Uthra R. (GSFC-672.0)[ADNET SYSTEMS INC]" <uthra.r.rao AT nasa DOT gov>
Date: Wednesday, May 25, 2016 at 2:04 PM
To: "bacula-users AT lists.sourceforge DOT net" <bacula-users AT lists.sourceforge DOT net>
Subject: [Bacula-users] LTO-7 tape drive settings in bacula 7.4.0

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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