Tape Library Concern - Eject & Reinsertion after each backup

Here is what I am currently using.
System overview:
-HP Proliant DL380p Gen 8
-HP D2600 2TB 3G SATA LFF - 24TB Storageworks array
-Quantum Scalar i40
(2) HP LTO-5 tape heads
(25) Licensed slots
Tape library is configured as one partition
Windows 2012 R2 - fully patched
DPM 2012 R2 Data Center Edition with 7/2014 Update Rollup 3
I have used DPM for about 6 years since 2007 version but I have always used stand alone LTO-3 & LTO-5 tape drives. I
have used tape libraries before that time but with a different product.
Here is the scenario I am seeing. Any tapes jobs that are scheduled at the same time will
pull a tape into each tape drive and backups are performed. All is working normal from that perspective. The problem I see is that after each backup is completed the tape is removed from the drive, placed back in the slot, removed again from the
slot and then re-inserted back into the drive to continue with the next backup job that was scheduled at the same time as the previous one.
This seems highly inefficient and time consuming not to mention a lot of extra wear & tear
on the library & tapes. Is this behavior normal? If so, can it be changed? or is it is bug?
I would expect the tape to remain in the tape drive until all backups are completed assuming they
had available capacity and were not off-site ready. It appears if multiple servers are in the same protection group the tape is not removed between these backups. The issue appears to be when the next separate protection group is backed up.
I’d even be up to manually moving the tape and leaving it in the tape in drive but I don’t see
that kind of library control with DPM.
I saw another thread from August where someone mentioned seeing this behavior when doing verifies
on their backups.
Thoughts? PSS call?
Thanks!

I'm seeing that if a protection group consisting of hundreds of small SQL databases is configured for short term disk and long term tape, and configured to use 2 drives, that after EACH DATABASE the tape is rewound and re-slotted, only to be re-inserted
into the drive and fast forwarded to the end for the next database to be written.
If you've got hundreds of databases (many small, like msdn, model, etc) this can push the time out to 3 minutes plus per database taped, even for a 5MB database.
My current workaround is to configure the protection group to only allow the use of a single drive.
Doing so seems to reduce the time per database from 5 minutes down to 30 seconds, presumably just REW and FF tape movement.
Even though the time is reduced, I'm still disappointed the progress between databases doesn't continuously stream. I mean 100 small 5MB databases should only take 7 seconds, if streaming at 70MB/s to tape. Instead it's 30 seconds per 5MB database.
:(

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Please remember to click “Mark as Answer” on the post that helps you. This posting is provided "AS IS" with no warranties. knowledge is valid only if it is shared by All.

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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.

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Thanks for the tip!
I installed Oracle Secure Backup Express and spend all afternoon with this strange product, mainly to troubleshoot the installation and setup. I'm not really sure everything works - it's quite a piece of software, as usual.
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# sg_map -i -x
/dev/sg9 3 0 1 0 1 /dev/nst0 IBM ULT3580-TD5 550V
/dev/sg10 3 0 2 0 1 /dev/nst1 IBM ULT3580-TD5 550V
/dev/sg11 3 0 3 0 1 /dev/nst2 IBM ULT3580-TD4 550V
/dev/sg12 3 0 4 0 1 /dev/nst3 IBM ULT3580-TD4 550V
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ORA-27023: skgfqsbi: media manager protocol error
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sbt__rpc_connect: Internal error - could not connect to obproxyd (Oracle Secure Backup error: 'bad port name specified (OB SBT proxy manager)').
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2011/01/23.02:11:10 [5431] can't set root privileges; continuing anyway - program isn't stamped setuid-root (OB utilities)
2011/01/23.02:11:10 [5431] can't listen for connections - Operation not permitted
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ORA-19506: failed to create sequential file, name="3cm2q2an_1_1", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
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(Oracle Secure Backup error: 'no preauth config found for OS user (OB tools) oracle').
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https://10.0.0.6, login as 'admin'
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Starting backup at 23-JAN-11
using channel ORA_SBT_TAPE_1
channel ORA_SBT_TAPE_1: starting full datafile backup set
channel ORA_SBT_TAPE_1: specifying datafile(s) in backup set
input datafile file number=00001 name=/scratch/oradata/test/system01.dbf
input datafile file number=00002 name=/scratch/oradata/test/sysaux01.dbf
input datafile file number=00003 name=/scratch/oradata/test/undotbs01.dbf
input datafile file number=00005 name=/scratch/oradata/test/users02.dbf
input datafile file number=00004 name=/scratch/oradata/test/users01.dbf
channel ORA_SBT_TAPE_1: starting piece 1 at 23-JAN-11
Now it just sits there forever and the log just keeps adding the following lines:
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2011/01/23.03:00:31 [5662] handle_qsp_msg: received get job state request
2011/01/23.03:00:31 [5662] job id 'admin/5.1'
Strange, backup to tape with 'mtx' and 'tar' works, so the problem might be OSB.
Edited by: Dude on Jan 22, 2011 8:32 PM
I finally got it running. I deleted the current library and drive configuration and used the webtool to configure the other library at /dev/sg17. it was also necessary to use the webtool to load a volume into the drive. Unfortunately I did not note down the steps in details. Maybe next time.
channel ORA_SBT_TAPE_1: starting piece 1 at 23-JAN-11
channel ORA_SBT_TAPE_1: finished piece 1 at 23-JAN-11
piece handle=3im2qc42_1_1 tag=TAG20110123T053042 comment=API Version 2.0,MMS Version 10.2.0.3
channel ORA_SBT_TAPE_1: backup set complete, elapsed time: 00:03:26
Finished backup at 23-JAN-11
Starting Control File and SPFILE Autobackup at 23-JAN-11
piece handle=c-2036659790-20110123-00 comment=API Version 2.0,MMS Version 10.2.0.3
Finished Control File and SPFILE Autobackup at 23-JAN-11

Two DPM 2012 R2 Servers - one tape library split logically

Hi
We’re looking to purchase a new tape library with two LTO6 drives.
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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.

Can restore backupset files from tape library to disk?

Hi,
I need to explain my scenario/position:
We backup our database every night to disk this command:
configure channel device type disk format "/backup/%d_%T_%s.%U";
backup filesperset 4 database;
After backup job is done create a lot of backupset files in /backup directory. And after we backup this backupset files to tape library, this command:
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How can i restore these backupset files to disk? I dont mean, restore database,datafiles, tablespace etc. I mean restore original backupset files to disks?
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Thanks..

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Tape Library Concern - Eject & Reinsertion after each backup

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