Thank you all for taking the time to reply to my email.
We are using LTO-7 tapes with the LTO-7 Tape drives. I don’t think the data
transfer rate is an issue in our case. I am thinking of removing the
“MaxBlocksize” and “Maximum Network Buffer Size” I have currently set for the
tape drives so that it will use the defaults. I will then run a test backup to
see if this helps.
Regards,
Uthra
From: Kern Sibbald [mailto:k...@sibbald.com]
Sent: Thursday, May 26, 2016 7:56 AM
To: Rao, Uthra R. (GSFC-672.0)[ADNET SYSTEMS INC];
bacula-users@lists.sourceforge.net
Subject: Re: [Bacula-users] LTO-7 tape drive settings in bacula 7.4.0
Hello,
The tape probably got an error. You should be able to see if there were
problems by looking at dmesg output and Bacula output for the job that marked
the tape full.
The error, if there was one, is very likely coming from the fact that you set
the block size too big. I believe that anything more than 512K will probably
not improve performance much but it will increase significantly the chances of
a write error.
Try running some tests with 512K max block size and see if the tape fills up
correctly.
Best regards,
Kern
On 25/05/2016 20:04, Rao, Uthra R. (GSFC-672.0)[ADNET SYSTEMS INC] wrote:
I have a Qualstar Tapeell 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
------------------------------------------------------------------------------
Mobile security can be enabling, not merely restricting. Employees who
bring their own devices (BYOD) to work are irked by the imposition of MDM
restrictions. Mobile Device Manager Plus allows you to control only the
apps on BYO-devices by containerizing them, leaving personal data untouched!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
_______________________________________________
Bacula-users mailing list
Bacula-users@lists.sourceforge.net<mailto:Bacula-users@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/bacula-users
------------------------------------------------------------------------------
Mobile security can be enabling, not merely restricting. Employees who
bring their own devices (BYOD) to work are irked by the imposition of MDM
restrictions. Mobile Device Manager Plus allows you to control only the
apps on BYO-devices by containerizing them, leaving personal data untouched!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
_______________________________________________
Bacula-users mailing list
Bacula-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bacula-users
