Slow Backup to Tape Speed with three Tape Drives ?!?!

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Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby WinstonWolf » Sun Jan 31, 2016 8:04 am

Hello ,

I have an HP MSL 4048 ,
In this Libary i have 2 LTO5 Ultrium Fibre Channel Drives .
I have 4 VM Backup Jobs
I have 2 Backup To Tape Jobs ( every within 2 of the VM Backup Jobs )
The first Backup to Tape Job should Backup 6TB to Tape
The Second Backup to Tape Job should Backup 3TB to Tape

Now my Idea :

I build in in the MSL 4048 an thirt LTO5 Drive , an LTO5 Ultrium SAS Drive .

Now i have three Drives in my MSL 4048 .

I configured the Media Pools so that the Tape Job with the 3TB Backup Size uses only one Tape Drive
and the Big Tape Job with 6 TB uses the new "Enable parallel processing for Jobs using this Media Pool " Option in Veeam 9

I let Start the smaller Job 30 minutes before the bigger Job . This Job ( Media Pool ) should only use one Drive .

30 minutes after the Job starts the Bigger job , this job should use 2 Drives ( the one is then the FC Drive and the other one the SAS Drive )

But it dont Works , only from the three Drives was used for the Backup Jobs , the SAS Drive is not used ,

ist something wrong in my Idea ?

The other Problem is that the Backups are very Slow .
WinstonWolf
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Re: Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby WinstonWolf » Sun Jan 31, 2016 4:20 pm

Here some Screenshots from the behavior :

I setup the Option that the Mediapool should use 2 Tapes :
Image

Image

Image
WinstonWolf
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Re: Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby Dima P. » Sun Jan 31, 2016 6:33 pm

Hi WinstonWolf,

If you want three drives to be used simultaneously you need to allow tape jobs pointed to this media pool to use up to 3 drives.

P.S. To troubleshoot the performance - open the case with support team.
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Re: Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby Gostev » Sun Jan 31, 2016 8:19 pm

Dima, your answer is not entirely clear. Please link the corresponding manual page explaining how one can do this. Thanks!
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Re: Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby WinstonWolf » Mon Feb 01, 2016 9:10 am

Ok , but as you can see , i choose the Job should use 2 Tapes , but he uses only one .
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Re: Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby WinstonWolf » Mon Feb 01, 2016 2:48 pm

Only for understanding :
When i choose in the Media Pool Settings "Enable parallel processing for Jobs using this Media Pool" and i choose that 2 Tapes should use the Pool , then normaly my Tape Job should use both Tapes ? Is this right ?
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Re: Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby WinstonWolf » Mon Feb 01, 2016 7:18 pm

Ok i make some Tests :

Test 1 : Backup to Tape Job which backups two VM Backup Jobs on am Media Pool , "Enable parallel processing for Jobs using this Media Pool" activated , Use of 3 Tapes choosen, "enable parallel Processing of Backup chains within an single Job " not activated
Result : Backup Job uses only one Tape Drive , Drive 1 .

Test 2 : Backup to Tape Job which backups two VM Backup Jobs on am Media Pool , "Enable parallel processing for Jobs using this Media Pool" activated , Use of 3 Tapes choosen, "enable parallel Processing of Backup chains within an single Job " activated
Result : Backup Job uses only two Tape Drives , Drive 1 and 2

Test 3 : Backup to Tape Job which backups two VM Backup Jobs on am Media Pool , "Enable parallel processing for Jobs using this Media Pool" activated , Use of 2 Tapes choosen, "enable parallel Processing of Backup chains within an single Job " activated , Tape Drive 2 disabled
Result : Backup Job uses only two Tape Drives , Drive 1 and 3

Hmm , i dont understand the logic behind this feature ?
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Re: Slow Backup to Tape Speed with three Tape Drives ?!?!

Veeam Logoby v.Eremin » Tue Feb 02, 2016 11:29 am

One backup chain occupies one thread (or one drive). Your source backup jobs seem to have only two chains combined. And two backup chains can be distributed between two drives only. That's why the third drive is always sitting in idle state. Thanks.
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