[ovirt-users] VM resource allocation and IO Threads

[Gianluca Cecchi]

Hello,
can anyone give any pointer to deeper information about what in subject and
the value for "Num Of IO Threads" configuration, best practices and
to-be-expected improvements?

I read also here:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.1/html-single/virtual_machine_management_guide/#Editing_IO_Threads

but in some points it seems not so clear to me:

eg:

If a virtual machine has more than one disk, you can enable or change the
number of IO threads to improve performance.

but also

Red Hat recommends using the default number of IO threads, which is 1.

There is also a note about deactivation and activation of disks: does it
mean that even if I poweroff the VM and change its config I have to make
this step after?

Anyone has run benchmarks?
Does it make sense if my VM has 3 disks to configure 6 IO threads for
example?
Do IO threads map to SCSI controllers inside the guest or what?

Thanks in advance,
Gianluca
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