Not very good tape performance

[syscom]

Hello,

Sorry for my bad English, French speaking.

I have set up Veeam for VMware V8 for a customer. They have a dedicated server (IBM x3650M4 HD) with 32 GB of RAM.

They have a LTO-6 tape library connected via FC into a dedicated Qlogic card.

We have tested full backup to tape and here are the results :

Size : 183,2 GB
Read : 183,2 GB
Transferred : 183,2 GB
Duration : 1:31:17

An average of ~33 MB/s

It seems to be not very fast... What do you think about that ? I expected over 100 MB/s.

[torendil]

Hello,

identical problem with a DELL TL4000 library (LTO4) and V8, 40-80MB/s expected but tape backup speed is 10MB/s...i wait a support solution.

you are not alone :-p

[veremin]

Guys, can you confirm that you're not affected by one of those known issues? Thanks.

[torendil]

I confirm, registry key for encryption was added and .dll was udapted...(only on the veeam "master" server) but i have also the fix for slow reverse incremental...my backup and tape proxy service are on the same (physical) server.

[veremin]

And what is identified as a major bottleneck in the tape job session statistics? Thanks.

[torendil]

target. I see network trafic on ressources monitor for 2 veeam services 1 send and the other receive...10MB/s by service
proxy is a 2008 R2 physical server and "master" is a windows 2012 VM.

(case id 00709443)

[Dima P.]

Jeremy,
What was selected as a source for the job in the question? Any chance you could run a performance test with the tape vendor native tool and let us know the results? Thank you.

[torendil]

It's a file to tape job with only veeam backup files.
If i do the same job with netbackup backup of 5To take 22hours=> 63MB/s

[Dima P.]

Jeremy, got it. Let’s wait for the result of support team investigation, meanwhile – please make sure you have installed the latest patch > KB1982. Thank you.

[syscom]

We have disabled "Use hardware compression if available" on every tape jobs and it seems to have solve the perfomance issues... 150 MB/s right now !

[Dima P.]

Syscom,
Glad you nailed it and thank you for sharing the solution with the community. Honestly, I was always thinking that tape library built-in hardware compression does not affect the performance (since it is inline compression). Just out of the curiosity what was the model of the library?

[torendil]

update 1 solve the problem, speed increase from 10MB to 100-130MB/s !!

[syscom]

Syscom,
Glad you nailed it and thank you for sharing the solution with the community. Honestly, I was always thinking that tape library built-in hardware compression does not affect the performance (since it is inline compression). Just out of the curiosity what was the model of the library?

IBM TS3200

[Dima P.]

Syscom,
Great, thanks for the heads up!