Object storage vs file storage7/7/2023 Ceph Storage ClusterĪ Ceph Storage Cluster is the deployment of two daemon types: one or more Ceph monitors and two or more Ceph object storage devices. A quick description of block storage vs object storage may help. OpenMetal Clouds all come with on-demand Ceph Object Storage as part of the Core and with stand-alone Storage Clusters. It is a service that runs on several or all of the members of a cluster and provides a S3 compatible API and gateway for your programs to add, remove, etc. Ceph has a native object storage gateway called RGW. This is separate from the concept of connecting to the Ceph Cluster to use it as an object store. Within the storage system itself, Ceph uses distributed object storage. In addition, the metadata server cluster can scale and rebalance the file system dynamically to distribute data evenly among cluster hosts, ensuring high performance and preventing heavy loads within the cluster. With the Ceph metadata server cluster, maps of the directories and file names are stored within RADOS clusters. FilesystemĬeph’s filesystem (CephFS) is a POSIX-compliant (which are standards used to ensure file compatibility between operating systems) filesystem that uses a Ceph Storage Cluster to store data. There is also great news coming with Ceph Crimson, a purpose built OSD system that helps leverage the incredible power of NVMe drives. The block device can also provide block storage to virtual machines in OpenStack. Ceph block devices utilize RADOS capabilities, which include snapshotting, replication and consistency. Ceph’s object storage system also allows users to mount Ceph as a thin-provisioned block device. When data is written to Ceph using a block device, Ceph automatically stripes and replicates the data across the cluster. Block StorageĬeph provides access to block storage through mounting the Ceph Cluster as block device through a Linux kernel module called RDB or Radios Block Device. Through Ceph’s software libraries, users gain direct access to the reliable autonomic distributed object store (RADOS) object-based storage system, which also provides a foundation for some of Ceph’s features, like RADOS Block Device and the Ceph Filesystem. ![]() ![]() This is different than other storage architectures that manage data in a file hierarchy, like file systems. Within the storage system itself, Ceph uses distributed object storage, which is a computer data storage architecture that treats data as objects. A Ceph Storage Cluster can have thousands of storage nodes. Within the Ceph Storage Cluster, the Ceph object storage devices stores the data as objects on storage nodes. In action, the Ceph filesystem, Ceph object storage, and Ceph block devices read data from and write data to the Ceph Storage Cluster. The deployment of one or more Ceph monitors and two or more Ceph object storage devices is called a Ceph Storage Cluster. Representational state transfer (RESTful) gateways (ceph-rgw) exposes the object storage layer as an interface compatible with OpenStack Swift APIs.Object storage devices (ceph-osd) store the actual content files.Metadata servers (ceph-mds) store the metadata of inodes and directories.Ceph managers (ceph-mgr) run alongside monitor daemons to provide additional monitoring and interfaces to external monitoring and management systems.Ceph monitors (ceph-mon) keep track of active and failed cluster nodes.How Does Ceph Work?Ĭeph can employ five distinct daemons that are all fully distributed and can run on the same set of servers, allowing users to interact directly with them: Ceph software also runs on commodity hardware and replicates data to make it fault-tolerant. It also aims for completely distributed operations without a single point of failure and is scalable to the exabyte level. Designed to be self-healing and self-managed, Ceph strives to reduce administrator and budget costs, allowing it to deal with outages on its own. What is Ceph?Ĭeph is an open source storage platform that is designed to allow object, block, and file storage from a single system. ![]() For more info check out our OpenMetal Private Cloud. Our background on Ceph comes from it being part of our hyper-converged private clouds but also as our underlying software for our stand-alone object storage systems. As technology and best practices move towards cloud based services to keep up with a thriving business, Ceph was born out of the need for a software solution that encourages a sustainable model for growth. Cloud hosting for enterprise-level deployments needs a highly scalable storage solution to streamline and manage important business data.
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