8:30 p.m.
New subject: NFS Storage Advice?
I have added the "async" option to the "additional mount options"
section.
Transferring from my raided SSD mirrors is QUITE fast now.
However, this might be confusing, but if I read/write to the nfs share at
the same time performance plummits.
So if I grab something from the SMB share over 10gb network and write this
to my VM being hosted on the NFS share. Bad performance.
Or If I copy and paste ISO from the VM to itself, horrible performance.
If I grab a file from a VM on my raised SSD storage and copy it to my VM on
the NFS Share, it has great performance (400+ MB/s)
Not quite sure what's going on! However if I grab something from the 1gbps
network everything seems okay. Or if I change the NFS Mount to the 1 gbps
everything is okay.
Any ideas?
On Sat, Jul 28, 2018 at 3:02 AM Karli Sjöberg <karli(a)inparadise.se> wrote:
On Jul 28, 2018 01:01, Wesley Stewart <wstewart3(a)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
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Karli Sjöberg -
Wesley Stewart