On Sun, 07 Jul 2024, Chuck Lever III wrote: > > Both the Linux NFS client and server implement RFC 8154 > well enough that this could be an alternative or even a > better solution than LOCALIO. The server stores an XFS > file system on the devices, and hands out layouts with > the device ID and LBAs of the extents where file content > is located. > > The fly in this ointment is the need for NFSv3 support. Another fly in this ointment is that only XFS currently implements that .map_blocks export_operation, so only it could be used as a server-side filesystem. Maybe that would not be a barrier to Mike, but it does make it a lot less interesting to me (not that I have a particular use case in mind, but I just find "local bypass for NFSv4.1+ on XFS" less interesting than "local bypass for NFS on Linux"). But my interest isn't a requirement of course. > > In an earlier email Mike mentioned that Hammerspace isn't > interested in providing a centrally managed directory of > block devices that could be utilized by the MDS to simply > inform the client of local devices. I don't think that's > the only possible solution for discovering the locality of > storage devices. Could you sketch out an alternate solution so that it can be assessed objectively? Thanks, NeilBrown
