How to test DRS ?

[leiw324]

Hello

Can I donwload some program to increase CPU or RAM loading to test DRS ?

or you have another way to test it ?

Thanks !

[rick-vanover]

PassMark Burn-In Test is a good program to light up CPU and RAM. The eval will run continuously for 15 minutes!

[idle-jam]

the ever famous cpubusy.vbs script. copy the below and name it cpubusy.vbs and run int.

Dim goal

Dim before

Dim x

Dim y

Dim i

goal = 2181818

Do While True

before = Timer

For i = 0 to goal

x = 0.000001

y = sin(x)

y = y + 0.00001

Next

y = y + 0.01

Loop

iDLE-jAM | VCP 2, VCP 3 & VCP 4

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[leiw324]

Hello

Thank for your script, I selected Keep Virtual machine Together on Rule for two VMs (A and B), when I run this script on A VM that can be migrated, and then run this script on B VM that cannot be migrated... And then I selected Separate Virtual Machine, the B VM can be migrated .

I have some questions:

1. If A VM CPU resource to be normal, can it go back to original host? if so, how can I know ?

2.If A VM CPU resource suddenly increased, will it migrate to another host ?

Thanks !

[idle-jam]

1) based on http://www.vmware.com/files/pdf/techpaper/VMW-Whats-New-vSphere41-HA.pdf on Required VM–Host Affinity

2) it will vmotion other VMs out of the host




iDLE-jAM | VCP 2, VCP 3 & VCP 4

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[leiw324]

1. Sorry, I don't understand what's Affinity, can you simple explain it ?

2. I mean after the A VM migrated to another host and then suddenly increase CPU resource, is it will vmotion other VMs out of the host?

Thanks !!

[idle-jam]

1) http://blog.koenvermoesen.be/2010/08/20/drs-host-affinity-rules/

2) yes




iDLE-jAM | VCP 2, VCP 3 & VCP 4

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[leiw324]

Hello

1. If set group manager, is it mean the auto vmotion back to original host ?

Thanks !

[idle-jam]

Yes in group of hosts that you defined in the policy.
iDLE-jAM | VCP 2, VCP 3 & VCP 4

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[leiw324]

Hello

I just followed your website to setup DRS rule for two hosts and 3 VMs.

Host01 has A, C VMs

Host02 has B VM

In this rule set Cluster Vm Group = A, B, C / Cluster Host Group = host01, host02

Selected "Must run on hosts in group"

When I run CPU script on C VM, it didn't vmotion to host02, why?

Thanks !

[idle-jam]

You need more VMs to make the hosts to be busy before DRS is being triggered. What's the overall resource (cpu and memory) utilization for the hosts?

iDLE-jAM | VCP 2, VCP 3 & VCP 4

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[leiw324]

Two hosts is same hardware, each host has 16GB ram and 2 quad core CPU

Is DRS count host resoruce, not resource pool ? if so, how can up so many 2 quad core CPU resources?

Thanks !

[idle-jam]

why not just clone as many as possible before bring the host down to it knees. and then you can see DRS in action.




iDLE-jAM | VCP 2, VCP 3 & VCP 4

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[leiw324]

I tried your method for HA, it work !

Is HA has fialback feature ?

Thanks !

[idle-jam]

we're talking about DRS, not sure how HA come into the picture 😃 just let the DRS to be automatic and let vcenter do the job. any particular concern you need to address?

iDLE-jAM | VCP 2, VCP 3 & VCP 4

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