Ceph is an Open Source file system originally developed for Linux systems. It runs on community hardware using the CRUSH (Controlled Replication Under Scalable Hashing) algorithm and in this post, we shall be learning a little more about Ceph storage architecture and how it is proven to be self-healing making your data storage more reliable.
Web Hosting, in simple terms, is the storage of your files and data on a server which is accessed by the users when they visit your site. While the amount of storage space is important to ensure that you don’t run out of space when your business expands, the type of storage architecture also plays a major role in determining the availability and security of your data. Ceph Storage offers a 3N redundancy which ensures that no single point of failure can affect your data stored in the cloud.
Let’s look at some factors that make Ceph storage self-healing:
Ceph Storage Architecture
Ceph is based on RADOS (Reliable, Autonomic, and Distributed Object Store). The Ceph storage cluster consists of nodes which have monitors and Object Storage Devices (OSDs).
A Ceph monitor holds the information about other monitors as well as all OSDs in the cluster. All monitors are kept in sync by the Paxos algorithm which creates a consensus about the cluster map available across monitors.
Once a Ceph storage cluster is in place, you can use the Ceph tool to monitor it. This involves checking the status of:
- Placement groups
- Metadata server
Ceph clusters maintain a cluster log that records high-level events about the entire system. Also, Ceph continuously runs various health checks against its own status. When a health check fails, this is reflected in the output of Ceph status. Further, messages are sent to the cluster log to indicate when a check fails, and when the cluster recovers. Ceph periodically scrubs placement groups to ensure that they contain the same information. Low-level or deep scrubbing reads the object data in each replica of the placement group to ensure that the data is identical across replicas. (docs.ceph.com)
If an OSD goes down, then Ceph automatically isolates the OSD after a predetermined time-interval and starts reallocating placement groups to other OSDs. At the same time, it also starts recovering them from their replicas.
In hosting types like Cloud Hosting, since the data is stored on a virtual machine, redundancy and availability of the data at all times is a critical aspect. While increased storage ensures that you don’t run out of space, a self-healing storage architecture like Ceph ensures that your worries about the security and availability of your data are taken care of. Also, it offers unlimited scalability making it a complete package for your storage requirements.
Since data integrity and security is one of the most important aspects one should consider while selecting hosting, Ceph storage architecture should definitely be something that can add to the overall reliability and performance of hosting environments. Ceph Storage can be especially useful for Cloud Hosting where the Cloud’s scalability and cost-effectiveness can be coupled with Ceph’s data reliability and speed.
Hope this helps and feel free to share your thoughts and questions in on Ceph in the comments section below.