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From Simon Weller <>
Subject Re: Cloudstack and KVM clusters,
Date Tue, 31 Mar 2015 21:09:19 GMT
The hosts need to be part of the same Cloudstack cluster, and depending on the underlying storage
technology, you may need a clustered file system as well.

A Cloudstack cluster is basically a group of physical hosts.

For example:

You build a new Zone in Cloudstack. Under the zone you have a pod. Within the pod, you build
a new cluster (just a group of hosts). Then you assigned 4 servers (hosts) into that cluster.
You will be able to live migrate between the 4 hosts assuming the original mentioned criteria
are met.

- Si

From: Rafael Weingartner <>
Sent: Tuesday, March 31, 2015 4:02 PM
Subject: Re: Cloudstack and KVM clusters,

Thanks Simon,

I think I got it.

So, the hosts do not need to be in a cluster to perform the live migration.

On Tue, Mar 31, 2015 at 5:59 PM, Simon Weller <> wrote:

> Rafael,
> KVM live migration really relies on whether the underlying shared storage
> (and file system) supports the ability to provide data consistency during a
> migration. You never ever want a situation where 2 hosts are able  to mount
> and write to the same volume concurrently.
> You can live migrate in KVM today using the following underlying file
> systems/methods:
> 1. NFS
> 2. CEPH
> 3. Clustered Logical Volume Management (CLVM) on top of SAN exposed
> storage via iSCSI,FC or FCOE.
> It's also possible to build your own storage driver and set a LUN to read
> only on a particular host using your SANs API.
> Solidfire, Nexenta and Cloudbyte have also added storage drivers more
> recently that may provide support for live migration, but as I'm not
> personally familiar with these storage platforms, I'll leave it up to
> others to comment if they wish.
> - Si
> ________________________________________
> From: Rafael Weingartner <>
> Sent: Tuesday, March 31, 2015 3:36 PM
> To:;
> Subject: Cloudstack and KVM clusters,
> Hi folks,
> I was looking a matrix of Cloudstack compatibility matrix at
> Slide 25 seemed to show that we cannot have clusters of KVM in CS? Is that
> true? Is it possible to live migrate VMs between KVM hosts that are not
> clustered in CS?
> --
> Rafael Weingärtner

Rafael Weingärtner

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