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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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Filesystem

We've noted that when using the FileStore back end for Ceph OSDs one has a choice of underlying filesystem. While EXT4, XFS, and Btrfs have been officially supported for some time, EXT4 suffers certain troublesome shortcomings, including its limited ability to store the XATTR metadata that Ceph requires. With the Luminous release, EXT4 as a filesystem choice for FileStore is strongly discouraged and in fact one must explicitly enable it if required, along with severe restrictions on Ceph OSD capabilities. Btrfs has both fans and detractors. Whatever one's feelings regarding it are, it is not widely used among Ceph deployments, and thus information within the community is limited.

This leaves XFS as the FileStore filesystem of choice. ...

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