Frequently asked questions
Frequently asked questions
Cloud Disk Array (CDA) is a private, dedicated (on disk level) storage system powered by Ceph. During development and testing it was known as Ceph-as-a-Service. CDA gives you storage space that can be utilized in a number of ways:
There are also other ways to access Ceph which are not currently available for CDA:
Our goal is to provide to customers all features of Ceph inside a service managed by OVH. Let us know which interfaces you're interested in.
Once you select a Data Center, your data will be replicated three times. Those replicas are placed on three different server machines on three different racks.
To reduce latency when accessing your cluster, your clients should be in the same OVH datacenter as your Ceph cluster.
Yes, you can increase size of you CDA through an API.
No - at the moment it is not possible.
You can enable CephFS using API to have fully managed distributed filestystem.
Short answer is: No - at the moment it is not possible.
In order to maximize performance and minimize latency for block devices (RBD) and fileystem (CephFS) it is only possible to use it inside OVH network - from other OVH services. If you need external access please contact us.
Please keep in mind that there are plans to add another mechanism for accessing CDA data storage - Rados Gateway. Rados Gateway will be able to expose CDA access to services located outside OVH via SWIFT API.
Any solutions that can connect to the OVH local network.
Public Cloud, Dedicated Server, Private Cloud Computing (PCC), VPS.
Cloud Disk Array is powered by Ceph, which is a storage solution with no single point of failure.
Whichever protocol you use to store your data in Ceph, it is stored internally as RADOS objects. Each object is replicated 3 times across 3 different servers in 3 different racks.
In case of 1 replica failure, there is no disruption for client (except for slight performance degradation because of recovery).
In case of 2 replica failures, client access is blocked to the degraded objects until they are replicated at least 2 times. This is done in order to prevent data loss.
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