On Jul 28, 2018 01:01, Wesley Stewart <wstewart3@gmail.com> wrote:
I currently have a NFS server with decent speeds.  I get about 200MB/s write and 400+ MB/s read.  

My single node oVirt host has a mirrored SSD store for my Windows 10 VM, and I have about 3-5 VMs running on the NFS data store.

However, VM/s on the NFS datastore are SLOW.  They can write to their own disk around 10-50 MB/s.  However a VM on the mirrored SSD drives can get 150-250 MB/s transfer speed from the same NFS storage (Through NFS mounts).

Does anyone have any suggestions on what I could try to speed up the NFS storage for the VMs?  My single node ovirt box has a 1ft Cat6 crossover cable plugged directly into my NFS servers 10GB port.

Thanks!
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It may be because of how oVirt mounts them, much more carefully, than Linux does by default. If I am not mistaken, oVirt mounts the NFS shares with 'sync', whereas a standard 'mount' with no options gets you 'async'. The difference in performance is huge, but for a reason; it's unsafe in case of a power failure. That may explain things.

/K