Freenas NFS Storage slow read performance with ATTO 64KB+

Hey guys,

First of all, just want to thanks you guys for ProxmoxVE pieces of softwares. Just discovered it (Don't know why took so much time) last weekend. I have been using VMWare ESXI 5.1 Free (and previous) version since 2 years for personal servers and projects at home. Just converted both of my server to test out Proxmox live migration and clustering and I must say im more than impressed. Everything works smoothly, cleanly and without errors !

Anyway, im almost up to the point to swap ESXI for Proxmox but I keep getting some strange performance results with my shared storage on Freenas NFS. I have been using NFS with ESXI for year without any performance issues.

Here is the ATTO result i have from guest on Proxmox and from ESXI running on the same hardware. No mather what I try to do on Proxmox, as soon as ATTO get into 64KB+ block size performance seem to strangely CAP Read at 10MB/sec. I have the same result on any of my two host using Windows XP or Windows 2012 Guest Proxmox. Look only i have problem on Windows Guest while using NFS...

Things I tried:

- All type of file format - Still slow
- Both host from shared NFS - Both slow
- VirtIO - Still slow
- Local storage - Good, speed is normal
- dd benchmark directly on NFS using SSH with 1M block - Good, speed is normal
- dd benchmark in a Centos Guest with 1M block - Good, speed is normal

Any Idea ?

VMWare NFS Freenas.pngProxmox NFS Freenas.png

Attached Images

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  Clik here to view. VMWare NFS Freenas.png (123.5 KB)
• Image may be NSFW.
  Clik here to view. Proxmox NFS Freenas.png (55.7 KB)