Two VMs on same host very slow

[lsilvaspbr]

I have seven hosts with ESXi 5.0 and two storage. When two vms are on the same host, the performance is much poor "in vms with Windows Server 2008 R2."

[vmroyale]

Hello and welcome to the communities.

How are the Windows 2008 R2 VMs configured? Are they on the same storage system? What are the workloads of these two systems?

[lsilvaspbr]

Hello Brian! Thanks for your response.

For example, one of my customer have two VMs:

     VM1 -> Windows Server 2008 R2 (Only two users are conected)

     VM2 -> Linux Centos 5.7 with OpenVPN)

Both VMs are stored in the same datastore, host and VLAN. But we have changed one of the vms to another host, the performance stay better.

[vmroyale]

How many vCPUs and how much memory are on these two VMs - and how much processing and RAM are on the hosts?

[arminmacx]

Hi

Check the virtual machine tab from your host and see how much work load do your vm(s) have. and in summry tab check how much your ESXi server have resources availabe and tell me here. if possible take a screen shot.

what is your storage type?

[lsilvaspbr]

The RAM and Proc required by these two VMs is very low. The problem occurs only when these two VMs are in the same host.

When we separate these two VMs (separated hosts only), the performance is very better.

Host Summary Print Screen:

[Gkeerthy]

please check the

CPU ready value, balooning, vmkernel swap usage, disk latency... that is Device leteny, kernel latency etc.... from the esxtop.

This will help to find the root cause...

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=100836...

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=200100...

[pchadwic]

How is the performance slow? excessive CPU usage? transfer between the 2 servers? (problem I'm experiencing), excessive IO wait time on the disks?