You can use erasure coding but it has to be fronted by a replicated cache
tier, or so states the documentation, I have never set up this
configuration, and always opt to use RBD directly on replicated pools.

On Fri, Sep 16, 2016 at 1:15 AM, Josh Durgin <> wrote:

> On 09/16/2016 09:46 AM, Erick Perez - Quadrian Enterprises wrote:
>> Can someone point me to a thread or site that uses ceph+erasure coding
>> to serve block storage for Virtual Machines running with Openstack+KVM?
>> All references that I found are using erasure coding for cold data or
>> *not* VM block access.
> Erasure coding is not supported by RBD currently, since EC pools only
> support append operations. There's work in progress to make it
> possible, by allowing overwrites for EC pools, but it won't be usable
> until at earliest Luminous [0].
> Josh
> [0]
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Wes Dillingham
Research Computing | Infrastructure Engineer
Harvard University | 38 Oxford Street, Cambridge, Ma 02138 | Room 210
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