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From Simon Weller <>
Subject Re: KVM + CLVM and Snapshots
Date Tue, 04 Apr 2017 15:49:19 GMT
We run Ceph and we've been very happy with it.

From: Engelmann Florian <>
Sent: Tuesday, April 4, 2017 10:28 AM
Subject: Re: KVM + CLVM and Snapshots


thank you both for your feedback! So we will drop CLVM from our test matrix.

A ScaleIO driver would be the perfect solution but I guess that won't happen... to time consuming

Ceph looks promising right now - less performance as ScaleIO but well supported and integrated
in ACS.

All the best,

From: Simon Weller <>
Sent: Tuesday, April 4, 2017 4:17 PM
Subject: Re: KVM + CLVM and Snapshots


It does work, but can be challenging when it comes to stability. We still have 2 zones build
with CLVM and we're activity migrating away from it. The major problem is that it complicates
host configurations and you really need a quorum disk in order to fence correctly. It's very
sensitive to load on the hosts and that can cause unexpected fencing activity and hence an
unstable cluster.

Are you able to export scalio storage via NFS? Your other option is to build a storage driver
in CloudStack that can control the storage access via APIs, rather than rely on an CLVM overlay.
If you are a paying customer of EMCs, you should reach out to them and see if they would consider
writing a storage plugin for you.

Your other option is to work with one of the professional services organizations associated
with ACS to write the driver for you (Cloudops, Shapeblue et al).

- Si

From: Engelmann Florian <>
Sent: Tuesday, April 4, 2017 4:13 AM
Subject: KVM + CLVM and Snapshots


as the cloudstack documentation explains CLVM is not supported with Cloudstack:

"The use of the Cluster Logical Volume Manager (CLVM) for KVM is not officially supported
with CloudStack."
Storage Setup — Apache CloudStack Installation ...<>
Primary Storage¶ CloudStack is designed to work with a wide variety of commodity and enterprise-rated
storage systems. CloudStack can also leverage the local disks ...

We would like to change our hypervisor from Xenserver to KVM but we have no idea how to use
ScaleIO with KVM without using CLVM?

The question is - why isn't CLVM supported? Is it because of snapshots are not allowed on
clustered VGs?

Any idea how to use ScaleIO with KVM as shared storage?

All the best,

EveryWare AG
Florian Engelmann
Systems Engineer
Zurlindenstrasse 52a
CH-8003 Zürich

T  +41 44 466 60 00
F  +41 44 466 60 10<>
EveryWare: Cloud- & IT-Services | IT-Outsourcing<><>
Ihr Schweizer IT-Service Provider - Cloud, Hosting, Datacenter, Internet, Netzwerk, Managed
IT-Services, IT-Outsourcing. Business IT-Lösungen von EveryWare.

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