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Ceph & Proxmox 3.x



Ceph is a free software unified storage platform designed to present object, block, and file storage from a single distributed cluster. Ceph's main goals are to be completely distributed without a single point of failure, scalable to the exabyte level, and freely-available. The data is seamlessly replicated, making it fault tolerant.[1]

Ceph is a software-based solution and runs on commodity hardware. The system is designed to be both self-healing and self-managing and strives to reduce both administrator and budget overhead.



RADOS: Reliable Autonomic Distributed Object Store is an object storage. RADOS takes care of distributing the objects across the whole storage cluster and replicating them for fault tolerance. It is built with 3 major components:

  • Object Storage Daemon (OSD): the storage daemon - RADOS service, the location of your data. You must have this daemon running on each server of your cluster. For each OSD you can have an associated hard drive disks. For performance purpose it’s usually better to pool your hard drive disk with raid arrays, LVM or btrfs pooling. With that, for one server your will have one daemon running. By default, three pools are created: data, metadata and RBD.
  • Meta-Data Server (MDS): this is where the metadata are stored. MDSs build POSIX file system on top of objects for Ceph clients. However if you are not using the Ceph File System, you do not need a meta data server.
  • Monitor (MON): this lightweight daemon handles all the communications with the external applications and the clients. It also provides a consensus for distributed decision making in a Ceph/RADOS cluster. For instance when you mount a Ceph shared on a client you point to the address of a MON server. It checks the state and the consistency of the data. In an ideal setup you will at least run 3 ceph-mon daemons on separate servers. Quorum decisions and calculs are elected by a majority vote, we expressly need odd number.


 howto05_small.pngComment ça marche ?




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