As far as I know FreeNAS supports VMware-like snapshots but not the language that oVirt speaks.

Another point to observe is that FreeNAS with RAID-Z3 is not recommended from VM storage, because it is just slow for this purpose. Usually NFS issues sync requests which will be slow due to it's nature. iSCSI tends to be faster since it can request sync and async operations.

If you pool does not have a ZIL for Sync Write Offload you'll get this kind of performance.

I have three oVirt installs backed by FreeNAS and all of them have 24 spindles in stripe of mirrors configuration, due to those issues.

Regards,


On 30 Apr 2021, at 14:05, Strahil Nikolov via Users <users@ovirt.org> wrote:

I have the feeling that it's using the wrong Network.

Also, check if TrueNAS supports NFS Server-Side Copy.
In order to use that feature mount the share  via v4.2 .


Best Regards,
Strahil Nikolov

On Fri, Apr 30, 2021 at 19:10, David Johnson
Hi everyone,

When cloning a VM, I discovered that the time to close appears excessive based on the underlying platform I am using. It appears that the clone operation is not making efficient use of the network.  I have seen up to 4 GBits sustained throughput by applications on VM's on the cluster.

Is there a configuration I might be missing?

System specifics:
Backing store: NFS on TrueNAS running zRaid 3 on 11 spinning disks

Ovirt Controller: I7 desktop
General network: 1 GBit Ethernet

Ovirt Host:  Intel(R) Xeon(R) Silver 4216 CPU @ 2.10GHz, 2x32 cores, 256 GB RAM
Data Network: 10 GBit 10GBase-Twinax, dedicated to this Host and the TrueNAS


Operation:
Copying the 60GB partition, the copy operation never exceeds 40 megabytes per second (less than 0.5 GBit), even though the dedicated 10 Gigabit data network is not otherwise busy.

<image.png>

David Johnson
Director of Development, Maxis Technology
844.696.2947 ext 702 (o) | 479.531.3590 (c)
 

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