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There is some debate about which is better or worse between Ceph and Swift. Ceph provides more flexibility in accessing data and storing information, but that doesn't necessarily mean it's a better object storage system than Swift.

Both Swift and Ceph provide object storage that splits data into binary objects and copies them to storage. With Ceph and Swift, object storage is created on top of the Linux file system. In addition, both Ceph and Swift are built with scalability in mind, so you can easily add storage nodes as needed. The main differences between the two are:

Access data

Swift was developed by Rackspace to provide scalable storage for the company's cloud. Because it is based on cloud development, its main access method is through RESTful API. Applications can address Swift directly (bypass the operating system) and submit data to Swift storage. This is useful in pure cloud-based environments, but it also complicates access to fast storage outside the cloud.

As for Ceph, from the beginning, its developers have worked to make it a more open object storage system than Swift. There are four ways to access Ceph:

Access to Amazon S3 compliant RESTful API through Rados gateways: this makes Ceph comparable to Swift or anything in the Amazon S3 cloud environment.

CephFS: this is a portable operating system interface compatible file system that runs on any Linux distribution, so the operating system can access Ceph storage directly.

Rados Block Device (RBD): RBD is a Linux kernel-level block device that allows users to access Ceph like other Linux block devices.

ISCSI Gateway: this is SUSE's supplement to the Ceph project. It allows administrators to run iSCSI gateways on Ceph and convert them into SAN files that any operating system can access.

So when comparing and evaluating Ceph and Swift, keep in mind that Ceph provides more ways to access object storage systems. Because of this, it is more practical and flexible than Swift.

Access storage information

Another aspect that distinguishes Ceph from Swift is how the client accesses the object storage system. In Swift, the client must contact the Swift gateway, which can lead to some potential single point of failure. To solve this problem, many Swift environments implement high availability for Swift gateways.

Ceph uses an object storage device (OSD) that runs on each storage node. Ceph can get information about the storage topology through OSD and where to collect binary objects to access the raw data. Another component required to access the object store runs on the client, so Ceph does not have a separate entry point for access to the storage. This makes it more flexible than Swift.

About use ca

There are fundamental differences in the way Ceph and Swift are organized, but this does not mean that the two are better or worse. Both are excellent open source projects that are actively used by users in all parts of the world-for different reasons. Ceph performs well in a single-site environment that requires highly consistent interaction between virtual machines, databases, and other data types, and Swift is more suitable for large environments where large amounts of data are handled. This difference is a direct result of how the two object storage systems deal with data consistency in their replication algorithms.

Ceph data is strongly consistent throughout the cluster, while Swift data is ultimately consistent. It achieves high availability and scalability at the expense of a certain degree of data consistency by introducing consistent hashing and data redundancy at the software level. It may take some time before data is synchronized across clusters.

So on the whole, neither of the two object storage systems, Ceph and Swift, can be said to be absolutely superior to the other, because they serve different purposes.

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