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Question

Vmware NBD restore speeds - What do you get.

  • April 24, 2024
  • 3 replies
  • 114 views

ApK
Byte
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  • Byte
  • 33 replies

Hi all.

 

I’m curious to know what speed others see when doing a Vmware NBD restore.

Hardware, configuration ect. is not important, just want to know the speed, as I do not know if my restore speed is fast or slow.

I get around 450Gb/h when restoring a single server via NBD.

 

What do you get?

 

Thanks

-Anders

3 replies

Damian Andre
Vaulter
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  • Vaulter
  • 1287 replies
  • April 24, 2024

Hey @ApK,

This might be useful - we have a tool that tests read/write performance of a datastore using the specified transport protocol.

 

Might help in your performance tuning endeavors. Its useful as it removes the disk read from the equation for testing restore scenarios etc.


ApK
Byte
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  • Author
  • Byte
  • 33 replies
  • April 24, 2024

Hi @Damian Andre.

 

Thanks for the above. I’m aware of the tool :-), but I’m just interested to hear from others, what they get of restore speeds.

At the moment I’m on lost ground on what can be expected from NBD restore. I can get a lot faster restore speeds from HotAdd.

Can you share any insights from Commvaults perspective, what do Commvault see when doing restores, what would be a good restore speed in respect to NBD?

 

Regards

-Anders


Damian Andre
Vaulter
Forum|alt.badge.img+23
  • Vaulter
  • 1287 replies
  • April 24, 2024

I don’t have any speeds to share (I’ll see if I can find an example), but I can say that NBD performance is throttled by ESX. The VMKernel port has a sort of quality of service function for NBD that means you never realize full network bandwidth - it wants to ensure availability for other services it provides.

Some say it taps out at around 100MB/sec - but perhaps could be more for multiple concurrent streams.

I don’t think we know quite what the rules and speeds are, as VMware has never officially disclosed it - but it has been tested and observed by other vendors as well.


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