Discussions specific to tape backups
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Tomas Snajdar
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backup to tape slow write speed

Post by Tomas Snajdar » Feb 20, 2019 7:37 pm

Hello,

I have an issue with backups to tape.

Right now I am using Quantum Scalar i40-i80 190G (IBM Ultrium-HH7 drive) with LTO-6 tapes.

Tape drive is directly connected via fiber to LUN (so there should not be the issue) on our repository.

Write speed for jobs (jobs with 5-6 VM or jobs with 1 VM - same results) is 100MB/s.

I tested also file to tape job, where I used 500GB .vbk file. Same 100MB/s result.

.VBK files are configured on optimal compression level.

I tested backup to tape with and also without hardware compression, but still with same result 100MB/s.

I am no expert, but I think that this is not optimal write speed for this configuration and in worst case it should runs around 150MB/s +- in uncompressed mode.

Could you give me some tips or help where could by issue and where I should start to solve my issue ?

Thank you and have a nice day.

Dima P.
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Re: backup to tape slow write speed

Post by Dima P. » Feb 20, 2019 8:54 pm

Hello and welcome to the community Tomas,

Can you please clarify what is your Veeam B&R version? Please check what is the block size value for the drive in the question (and what is the possible maximum)? Thank you!

Tomas Snajdar
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Re: backup to tape slow write speed

Post by Tomas Snajdar » Feb 20, 2019 9:07 pm

Hello Dima,

I am using Enterprise Edition of 9.5 U4 version.

Block size for drive is configured to 262144 and max available option for size is 524288.

Tomas Snajdar
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Re: backup to tape slow write speed

Post by Tomas Snajdar » Feb 21, 2019 4:25 am

I missed information that Veeam shows bottleneck for all jobs as "Target", but in time when tape job was running was only this job active

Dima P.
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Re: backup to tape slow write speed

Post by Dima P. » Feb 21, 2019 6:40 pm

Can you please clarify what type of backup repository you are using? Any chance your tape server (Veeam B&R role to manage tape device) is located on the same repository machine? Thanks!

Tomas Snajdar
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Re: backup to tape slow write speed

Post by Tomas Snajdar » Feb 21, 2019 8:41 pm

Our repository is a Windows 2016 Hewlett Packard server Proliant DL380 Gen9. Storage is 3PAR.

The tape drive is presented to the repository via the LUN. It is actually physically attached to the Quantum tape library.

Dima P.
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Re: backup to tape slow write speed

Post by Dima P. » Feb 22, 2019 5:10 pm


Tomas Snajdar
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Re: backup to tape slow write speed

Post by Tomas Snajdar » Feb 25, 2019 6:16 pm

He,

I double checked it and yes tape server is directly connected to our repository server. Also I tested tape job to use Repository proxy (with disabled Veeam server Proxy) and speed is still same.

Percent busy for processing stages were:

Source 6%
Proxy 1%
Network 10%
Target 99%

Do you have another suggestions where could be issue ?

Dima P.
Product Manager
Posts: 9911
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Re: backup to tape slow write speed

Post by Dima P. » Feb 27, 2019 11:02 am

Tomas,

I believe that test via native vendor tools is required to compare the results. You can open a support case and let our team help you with it. If you do, please share your case ID in this thread.

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