On Tue, Feb 5, 2019 at 3:58 PM Hetz Ben Hamo <h...@hetz.biz> wrote:
> Hi,
>
> I'm doing some very simple disk benchmarks on Windows 10, both with ESXI
> 6.7 and oVirt 4.3.0.
> Both Windows 10 Pro guests have all the driver installed.
> the "Storage" (Datastore in VMWare and storage domains in oVirt) comes
> from the same ZFS machine, both mounted as NFS *without* any parameters
> for NFS mount.
> The ESXI is running on HP DL360 G7 with E5620 CPU, while the oVirt node is
> running on IBM X3550 M3 with dual Xeon E5620. There are no memory issues as
> both machines have plenty of free memory and free CPU resources.
>
> Screenshots:
>
> - Windows 10 in vSphere 6.7 - https://imgur.com/V75ep2n
> - Windows 10 in oVirt 4.3.0 - https://imgur.com/3JDrWLx
>
> As you can see, while oVirt lags a bit in 4K Read, the write performance
> is really bad.
>
382 MiB/s vs 54 MiBs? smells like someone is cheating :-)
Maybe VMWare is using buffered I/O, so you test writing to the host buffer
cache,
while oVirt is using cache=none, and actually writing to the remote storage.
But this is only a wild guess, we need much more details.
Lets start by getting more details about your setup, so we can reproduce it
in our lab.
- What is the network topology?
- Spec of the NFS server?
- Configuration of the VM on both oVirt and VMWare.
- How do you test? how much data is written during the test?
- How it compares to running the same tests on the hypervisor?
For oVirt, getting the VM XML would be helpful - try:
Find the vm id:
sudo virsh -r list
Dump the xml:
sudo virsh -r dumpxml N
For testing, you should probably use fio:
https://bluestop.org/fio/
Added people who can help to diagnose this or at least ask better questions.
Nir
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