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From Geoff Higginbottom <>
Subject RE: CloudStack DR Approach (not HA)
Date Mon, 24 Mar 2014 20:56:49 GMT
ShapeBlue are currently working on a solution for Zone Failover of VMs, I cannot confirm which
version it will be included in, but 4.5 is a possibility.

With regards to the replication of volume snapshots, that is effectively available today using
the S3 backed secondary storage feature.


Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

-----Original Message-----
From: Kristoffer Sheather @ CloudCentral []
Sent: 24 March 2014 20:53
Subject: re: CloudStack DR Approach (not HA)

Hi Jim,

 Very good questions and I am keen to see the answers as well.  CloudStack definitely needs
to support this scenario (I don't believe it currently does).  Cross zone replication of snapshots
with the ability to bring up VM's from those snapshots is something I'd like to see too.


Kristoffer Sheather
Cloud Central
Scale Your Data Center In The Cloud
Phone: 1300 144 007 | Mobile: +61 414 573 130 | Email:
LinkedIn:   | Skype: kristoffer.sheather | Twitter:

 From: "Jim Jones" <>
Sent: Tuesday, March 25, 2014 6:11 AM
Subject: CloudStack DR Approach (not HA)

I am interested to know what everyone is using to provide disaster recovery for VMs running
in CloudStack?

Note, I am talking about true DR to another data center, not HA. I have seen the previous
thread where someone asked about DR, but the answer provided only talked about HA of VMs within
the same Cluster or Zone. This is not my question.

I am looking for a method to maintain an up-to-date copy of a running VM, including its data,
in another Zone or Region, such that if the first Zone is destroyed, the VM can be brought
up in the other Zone and continue production.

Before cloud, DR for virtualized environments was typically handled using SAN replication.
The VMs would be quiesced and snapshotted at regular intervals (e.g. hourly), and the SAN
LUNs would be continuously replicated asynchronously. Following this approach, if the primary
site was destroyed, the SAN LUNs would be enabled for read-write at the secondary location,
and the VMs could then be started there, using the last successful snapshot (the last consistency

I have looked at what Amazon and Rackspace provide for their Clouds, and the approach seems
to be user-initiated quiesced cloud snapshots, combined with Secondary Storage that is automatically
replicated and available throughout their Clouds. Therefore, if the site where the VM is running
gets destroyed, the latest VM snapshot can be deployed from Secondary Storage to any other

I would like to know if anybody has experience/insights using this approach on CloudStack,
particularly using XenServer hosts.

Is there a mechanism available for end-users to create quiesced CloudStack snapshots of running
production VMs, such that applications and filesystems are put into a consistent state prior
to the snapshot being created?

Also, can anybody offer insight into how to automatically or continuously replicate Secondary
Storage across Zones or Regions, using NFS-based Secondary Storage (not object storage), such
that CloudStack users will see any be able to deploy their Snapshots in any other Zone or

If what I am describing is not yet possible with CloudStack, I would be like to be pointed
towards the part of the CloudStack roadmap that discusses the planned architecture.


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