Hello,
Have you checked if you do not have a Maximum Volume Bytes configured in
your Pool resource?
Best regards,
Ana
On Thu, May 26, 2016 at 10:05 PM, Kern Sibbald <k...@sibbald.com> wrote:
> I recommend to remove the Maximum Network Buffer Size. Bacula will figure
> it out itself.
>
>
> On 05/26/2016 08:43 PM, Rao, Uthra R. (GSFC-672.0)[ADNET SYSTEMS INC]
> wrote:
>
> Kern,
>
>
>
> Okay, Thank you. I will try setting the block size to 512k to improve the
> speed of writing to the tape. What about the “Maximum Network Buffer Size
> = 65536*” *I have currently set in my configuration? Should I remove this
> or change the value I have set? Please let me know.
>
>
>
> Regards,
>
> Uthra
>
>
>
> *From:* Kern Sibbald [mailto:k...@sibbald.com <k...@sibbald.com>]
> *Sent:* Thursday, May 26, 2016 2:35 PM
> *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
>
>
>
> The defaults for both of those should work out of the box. However, by
> increasing the Maximum Block Size, you can probably improve the speed of
> writing to the tape. This is, of course, optional. I would still not set
> the block size any larger than 512K though.
>
> Best regards,
> Kern
>
> On 05/26/2016 08:16 PM, Rao, Uthra R. (GSFC-672.0)[ADNET SYSTEMS INC]
> wrote:
>
> 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 <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
>
>
>
>
>
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>
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> restrictions. Mobile Device Manager Plus allows you to control only the
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