XFS: the filesystem of the future? [LWN.net]

XFS: the filesystem of the future?

Posted Jan 27, 2012 1:18 UTC (Fri) by dgc (subscriber, #6611)
In reply to: XFS: the filesystem of the future? by nix
Parent article: XFS: the filesystem of the future?

> Because NFS is stateless

Right and wrong.

The NFSv3 server is stateless, but the NFSv4 server is stateful to support functionality like file delegations to clients. Such functioanlity may require storing per-file state. e.g. so that the server can revoke a file delegation from a client when another client wants to access it.

Dave.

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XFS: the filesystem of the future?

Posted Jan 27, 2012 22:01 UTC (Fri) by nix (subscriber, #2304) [Link]

True. I'd forgotten all about NFSv4, and you're right that statefulness actually imposes *more* requirements on the underlying fs than statelessness does, because that state has to get stored somewhere, and it has to survive server reboots...