ESXi5 - problems with NFS and the data copy store

Hello world

I recently moved into a solution fully virtualized for my network, 3 x 5 ESXi servers running on our GigE network.

First of all, I use all free software from VMware, so vCentre etc is out of the question.

I have major problems when you try to copy files between:

  • NAS (NFS) to ESXi 5 host
  • ESXi host to the NAS (NFS) 5
  • And using VMware converter between ESXi 5 hosts converter Standalone

The problem is that whenever I'm transfer between hosts I am struck with the horrible network performance. Even if I use GigE adapters and switches between my hosts I will receive no more than 12 Mbps speed of transfer real (100 Mbit/s connect?).

On the flipside, if I use virtual guests on the same exact host I can happily transfer data between my NAS (NFS) servers with speeds between 60-150MBps ~ (1000 Mbps).

Examples:

Speed of 10 Mbps of transfer of ESXi_1 copy OF NFS data store share ~

Server2008 (comments, located on ESXi_1) copy OF NFS 75MBps transfer rate ~.

Server2011 SBS (comments, located on ESXi_2) copy OF Windows share 2008 (ESXi_1) transfer speed 120MBps. ~

ESXi_2 copy OF NFS data store share transfer rate 5MBps ~.

Attached (wtf.png) example:

I copy a file that is located on our NFS share first, it's a 3 GB file to the copy within guest OS (2008), it is indicated in blue - top speed of 80MBps

I copy the same exact NFS share for the host (datastore1), this is indicated in red - top speed of 7.5Mbps

The third transfer/s (green) is between the customers of windows on different hosts, transfer a 6 GB file as well as a copy of the 360 MB file - transfers two happily send to GigE speeds with a peak around 40MBps

I can reflect these results across the three servers without modification. Copies between you will be able to run well enough (not exactly 100% use of GigE) but at the moment where I try to do something to the data store it will just choke at all about a 100 Mbps connection speed.

The final image (wot.png) confuses me beyond belief. I would try to explain what is happening here:

  • This image shows two times the same exact file transfers, except even machine PHYSICS
  • The first (red) transfer between the ESXi_2 host server and the NFS share using the browser data store and direct download - its top speed is around 8MBps
  • The second (green) transfer between a guest server 2008 running on ESXi_2, download the same file exactly at the exact location using vSphere Client. I mean the same EXACT file; It connects to the NFS drive by the data store ESXi_2 (NFS share).

Why on earth can my comments directly download a file on a data store connected to NFS GigE clocked and yet the same exact host cannot go anywhere near corresponding to these speeds?

As indicated in the title, the problem seems to happen whenever I use ESXi datastore browser on the host computer using vSphere Client or between browser datastore ESXi to/from an NFS share.

No one knows what might happen?

Is there some sort of restriction on the transfer of files between a host and shared NFS ESXi 5? Whence this bottleneck?

Thanks in advance for all the help/ideas that guys can throw my way.

P.S. Sorry for the wall of text, I really wanted to give as much information. as possible.

What type of storage you have locally on the host computer?

I have seen this problem with write-through controllers: http://wahlnetwork.com/2011/07/20/solving-slow-write-speeds-when-using-local-storage-on-a-vsphere-host/

Tags: VMware

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