[INTPenis]

>Lesson 3: XFS+Ceph never really worked out. BlueStore solved so many problems by just removing the XFS dependency for the actual data. Recommended reading: https://www.pdl.cmu.edu/PDL-FTP/Storage/ceph-exp-sosp19.pdf

This gave me a concern. My kube nodes do use XFS in some cases but Ceph uses raw block devices. So XFS is only used for system files, not for Ceph. Except of course to store Ceph config on each node.

So I assume I'm safe. I'm not entirely sure how you'd use XFS with Ceph because Ceph uses a raw device file and formats it for its own storage.

[Nullabillity]

Ceph OSD has two different storage backends:

- Filestore is the legacy backend that uses files on a filesystem (strongly recommended to be XFS)

- Bluestore is the modern backend that uses raw device files directly

[sp332]

From the linked PDF: For a decade, the Ceph distributed file system followed the conventional wisdom of building its storage backend on top of local file systems. This is a preferred choice for most dis- tributed file systems today because it allows them to benefit from the convenience and maturity of battle-tested code.