Xenserver 7.2 very slow windows VM (file copy)

[Roel Niesen]

Hello,

 

This is my setup

 

- 1 server 2x 2620V4

- 64 GB ram

- 8 x 600GB sas 15K disks in raid 10 as local SR

- lsi 3108 with 2GB cache controller

- emulex lom wiht 2 x 10Gps nics

- 2 nics are in a bound lacp a-a ip-based

 

I installed 2 windows 10 cleints with xenserver tools.

I copie 30 GB of data in geust 1 and shared this.

I copied these files in guest 2 over the share.

 

The speed is a poor 45MBps.

This is very slow not?

 

The raid10 should have a speed around 600 MB/s.

And a network problem should not be there because we have 2 x 10Gbps.

 

I know already that the speed notification off the nics are harde coded to 1 gps.

 

How can I maximize the speed of these machines?

 

 

Thanks.

 

Roel Niesen

 

[jef van Eijk1709152737]

Have you ever solved this?

[Christoph Kolbicz1709156882]

have you adjusted your bios settings to high performance under power settings? servers come in power saving mode which has a big impact in performance 

[Alan Lantz]

VM to VM could be your worst case scenario as well. How does performance look when testing disk i/o to either local or remote storage? I haven't noticed anything odd with Emulex, firmware is all I could suggest for those. If you have two XenServers how does VM to VM across two XenServers perform ?

 

--Alan--

[Boby John1709155536]

One good tool for performance testing is iperf. Can you try that and check what speed you get ?

[Hans Blaasvaer]

I have somewhat the same problem, I get around 60MB/s and this is also with 10gbe and SSD disks (xenserver 7.1). This is the same performance as before I upgraded, and I expected a big increase in speed, but got nothing. I have tried everything, like changing the linux scheduler, disk passthrough, BIOS settings and changing the network buffer settings. Migration of disks are as slow, i.e. 40-60MB/s but memory migration runs at full speed, i.e. 800MB/s, it is so fast, that it takes only a few seconds for 4gb.

 

I wonder if anyone else is able to achieve higher transfer rates. Please post them here, and perhaps with settings/setup that makes it possible.

[Tobias Kreidl]

How many VCPUs and how much memory is assigned to your dom0 instances? Lack of resources can lead to slower I/O rates.

[Alan Lantz]

with 10Gb dedicated storage network you should be able to hit 300MB/Sec easily.

 

--Alan--

 

[Alan Lantz]

I guess I should qualify that by saying that you are testing to 10Gb storage? If you are just doing VM tests over 1GB links 

75MB/sec or so will be the limit, but if you are testing disk writes to 10Gb storage then 300MB/sec should be the target.

 

--Alan--

 

[Hans Blaasvaer]

My setup has 4GB of dom0 memory and only 10gb links. I wish I could get 300MB/s and any help is appreciated.

[Joshua Holmes]

On 12/4/2017 at 3:41 PM, Hans Blaasvaer said:

My setup has 4GB of dom0 memory and only 10gb links. I wish I could get 300MB/s and any help is appreciated.

 

Did you ever find resolution on this?  I have the identical problem.  All SSD Flash, dual 10GB Fiber NIC on redundant bridged network etc etc.  All the best.  JumboFrames are on etc.  Still cannot get better than 3MBps (25Mbps)

[Alan Lantz]

If XenServer is 7.x or above and you have all of the hotfixes installed and nic drivers installed?

Could be a network configuration issue or Dom0 memory issue.

 

--Alan--