So CLVM used to be supported (and probably still works). I'd highly recommend 
you avoid using a clustered file system if you can avoid it. See if your SAN 
supports the ability to do exclusive locking.

There was chatter on the list a couple of years ago about a scaleio storage 
driver, but I'm not sure whether there was any movement on that or not.

- Si

From: S. Brüseke - proIO GmbH <>
Sent: Monday, February 19, 2018 4:57 AM
Subject: KVM with shared storage

Hi @all,

I am evaluating KVM for our Cloudstack installation. We are using XenServer at 
the moment. We want to use shared storage so we can do live migration of VMs.
For our KVM hosts I am using CentOS7 with standard kernel as OS and for shared 
storage I am evaluating ScaleIO. KVM and ScaleIO installation is working great 
and I can map a volume to all KVM hosts.
I end up with a device (dev/scinia) of block storage on all KVM hosts.

As far as I understand I need a cluster filesystem on this device so I can use 
it on all KVM hosts simultaneously. So my options are ocfs2, gfs2 and clvm. As 
documented clvm is not supported by Cloudstack and therefore not really an 
I found this shapeblue howto 
 for ocfs2, but this is for CentOS6 and I am unable to find a working ocfs2 
module for CentOS7 standard kernel.

Installing and Configuring an OCFS2 Clustered File System 
Last year we had a project which required us to build out a KVM environment 
which used shared storage. Most often that would be NFS all the way and very 
occasionally ...

So my question is how are you implementing shared storage with KVM hosts in 
your Cloudstack installation if it is not NFS? Thx for your help!

Mit freundlichen Grüßen / With kind regards,


- proIO GmbH -
Geschäftsführer: Swen Brüseke
Sitz der Gesellschaft: Frankfurt am Main

USt-IdNr. DE 267 075 918
Registergericht: Frankfurt am Main - HRB 86239

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