+6
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
+23
Hey
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.
+6
Hi
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
+23
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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