[ovirt-users] Q: VM disk speed penalty NFS vs Local data center storage

[Pavel Gashev]

Andrei,

You could try pNFS. It allows to access a data on a local storage directly bypassing NFS and even FS level.
Unfortunately, it requires SCSI Persistent Reservation feature so would not work all RAID controllers.

From: <users-bounces at ovirt.org> on behalf of Yaniv Kaul <ykaul at redhat.com>
Date: Monday, 26 February 2018 at 14:49
To: Andrei Verovski <andreil1 at starlett.lv>
Cc: Ovirt Users <users at ovirt.org>
Subject: Re: [ovirt-users] Q: VM disk speed penalty NFS vs Local data center storage



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

Since oVirt doesn’t support more then 1 host in data center with local storage domain as described here:
http://lists.ovirt.org/pipermail/users/2018-January/086118.html

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


_______________________________________________
Users mailing list
Users at ovirt.org<mailto:Users at ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20180304/c9628921/attachment.html>