RHEV 3.6 VirtIO Back Data plane activaiton for dummys

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Hello dear RHEV Guru team,

I m looking to enable VirtIO Back Data plane on Each disk (Hypervisor RHEV 3.6 using only local storage mode (SSD))
I m not able to find something recent (3.6) to enable this for a noob like me...if some one can help me
Other point, can you confirm that live migration is supported in 3.6 (the underlying SSD storage is replicated)

LK
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LK Community Member 50 points
23 May 2016 2:21 PM

No one ? no Guru available ?

LK Community Member 50 points
26 May 2016 11:09 AM

UP !

David Powles's picture Red Hat 25369 points
1 June 2016 7:08 AM

Hi Laurent. Sorry no one has been able to help you out here yet. I'll see if I can track down someone to assist.

FD Red Hat Community Member 65 points
1 June 2016 3:04 PM

Migration of local storage is not supported on RHEV 3.6:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.6/html-single/Administration_Guide/index.html#sect-Preparing_and_Adding_Local_Storage

LK Community Member 50 points
1 June 2016 3:20 PM

Hello David, Thx to you !

hello Franck, Thx for this feedback, I have seen this. I will try using another trick ;0) any info on Virtio Back Data Plane activation on RHEV 3.6 ?

FD Red Hat Community Member 65 points
1 June 2016 3:35 PM

Do you mean virtio-blk data plane?

LK Community Member 50 points
1 June 2016 3:58 PM

yes sorry....

FD Red Hat Community Member 65 points
1 June 2016 5:19 PM

OK well I believe I has sorted out why you cannot find any documentation on this. In the RHEV 3.6 Technical Notes we call it by virtio-blk data plane and show it as a new feature: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.6/html-single/Technical_Notes/index.html

However in the Virtual Machine Management Guide we show this option with the name IO Threads: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.6/html-single/Virtual_Machine_Management_Guide/index.html

So if you edit a virtual machine you will see under Resource Allocation a check box to enable IO Threads and a number of IO Threads Count that is configurable. I hope this helps.

Regards,

Frank

LK Community Member 50 points
3 June 2016 7:57 AM

Hello Franck, thx for your help and comment and thx for the link

the "IO Threads option" looks good, but are we sure that the new feature "VirtIO-Blk Data Plane" is activated by using the "IO thread" option (not the same name so i have suddenly a little doubt ? no more step (using QEMU or others) ?

FD Red Hat Community Member 65 points
3 June 2016 10:03 AM

Yes they are the same. I had to chase around a few RFE bugs and then a doc bug to link them but they are the same new feature. I am not certain why the naming change however I found it confusing enough to create a Knowledgebase article, it is out for review now and should be published soon.

LK Community Member 50 points
3 June 2016 12:15 PM

Hello Franck thx a lot for your help, it is more clear

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