On Mon, Feb 26, 2018 at 1:30 PM, Andrei Verovski <andreil1@starlett.lv> wrote:
Hi,

Since oVirt doesn’t support more then 1 host in data center with local storage domain as described here:

I have to setup NFS server on node with VMs (on same node) access via NFS.
10 GB shared storage is in the future plans yet right now have only 2 nodes with local RAID on each.

Q: What is VM disk speed penalty (approx %)  NFS vs Local RAID in oVirt data center storage? 
Currently I have 2 VMs running our accounting/inventory control system which are critical to storage performance limits.
2 other VMs have very low disk activity.

I don't know, but please remember there's both latency and throughput, both of which are somewhat affected. Throughput will benefit from jumbo frames, for example. Unfortunately it may affect latency a bit.
There was an interesting patch that if the NFS was local, bypassed the NFS[1]. It was never completed and merged.
Lastly, chapter 6 at hyper-converged guide (should be available in few hours) might be an interesting idea for you to consider - a single Gluster that can later expand.
Y.

[1] https://gerrit.ovirt.org/#/c/68822/
[2] https://ovirt.org/documentation/gluster-hyperconverged/Gluster_Hyperconverged_Guide/

 

Thanks in advance
Andrei Verovski


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