I have  opened https://bugzilla.redhat.com/show_bug.cgi?id=1691405

Best Regards,
Strahil NikolovOn Mar 21, 2019 09:43, Simone Tiraboschi <[email protected]> 
wrote:
>
>
>
> On Thu, Mar 21, 2019 at 6:14 AM Strahil <[email protected]> wrote:
>>
>> Unfortunately, the ideal scheduler really depends on storage configuration. 
>> Gluster, ZFS, iSCSI, FC, and NFS don't align on a single "best" 
>> configuration (to say nothing of direct LUNs on guests), then there's 
>> workload considerations.
>> >
>> > The scale team is aiming for a balanced "default" policy rather than one 
>> > which is best for a specific environment.
>> >
>> > That said, I'm optimistic that the results will let us give better 
>> > recommendations if your workload/storage benefits from a different 
>> > scheduler
>>
>> I completely disagree !
>> If you use anything other than noop/none (depending if multiqueue is on), 
>> your scheduler inside the VM will reorder and delay your I/O.
>> Then the I/O will be received by the Host and this repeats again.
>> I can point to SuSe and Red Hat knowledge base where both vendors highly 
>> recommend noop/none as schedulers for VM.
>> It has nothing in common with the backend - that's in control of the hosts 
>> I/O scheduler.
>>
>> Can some one tell me under which section should I open a bug ? Bugzilla is 
>> not newbie-friendly and I should admit that opening bugs for RHEL/CentOS is 
>> far easier.
>>
>> The best bug section might be ovirt appliance  - related , as this is only 
>> valid for VMs and not bare-metal Engine.
>
>
> Yes, it seems the most appropriate choice; start from here: 
> https://bugzilla.redhat.com/enter_bug.cgi?product=ovirt-appliance
> thanks
>  
>>
>> Best Regards,
>> Strahil Nikolov
>>
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