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From "Lucy" <>
Subject Re: About Allocator algorithm of creating VM on Host
Date Tue, 23 Oct 2012 02:29:10 GMT
Hi Prachi & Tamas ,

Thanks for the reply.
It's very helpful.


-----Original Message-----

From: Prachi Damle [] 
发送时间: 2012年10月23日 3:09
主题: RE: About Allocator algorithm of creating VM on Host

Allocator choices are as described below and the global confg param to use
is  'vm.allocation.algorithm' and is set to randon by default.

About detecting 80% CPU/RAM usage - there are various cluster level
thresholds one can set through global configurations to track the capacity
usage per cluster.
Upon crossing the thresholds, alerts are generated. Also new VM deployments
do not occur above the threshold limits.


-----Original Message-----
From: Tamas Monos [] 
Sent: Monday, October 22, 2012 3:29 AM
Subject: RE: About Allocator algorithm of creating VM on Host


The 3.0.2 support the following VM allocation algorithms:

'random', 'firstfit', 'userdispersing', 'userconcentratedpod_random',

You can configure this in the global configuration options. The default is
random I guess.
I don't think CloudStack will detect any of those you require however I
think hypervisors should.
Your hypervisor cluster (I use ESX) will detect issues and send alerts, I'm
sure there is something for xen/kvm as well.


Tamas Monos                                               DDI
Chief Technical                                             Office
Veber: The Hosting Specialists               Fax         +44(0)871 522 7057

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-----Original Message-----
From: Lucy []
Sent: 22 October 2012 10:45
Subject: About Allocatoralgorithm of creating VM on Host

Dear all,



I have a question about allocator algorithm of creating VMs on Host.


What's the default allocator algorithm to allocate VM on Host in Cloudstack?


And are there any other choice?


Can Cloudstack detect heavy loadbalance ,for example one host's CPU/memory
is greater than 80%?





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