Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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==================================
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pNFS SCSI layout server user guide
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==================================
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This document describes support for pNFS SCSI layouts in the Linux NFS server.
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With pNFS SCSI layouts, the NFS server acts as Metadata Server (MDS) for pNFS,
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which in addition to handling all the metadata access to the NFS export,
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also hands out layouts to the clients so that they can directly access the
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underlying SCSI LUNs that are shared with the client.
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To use pNFS SCSI layouts with the Linux NFS server, the exported file
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system needs to support the pNFS SCSI layouts (currently just XFS), and the
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file system must sit on a SCSI LUN that is accessible to the clients in
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addition to the MDS. As of now the file system needs to sit directly on the
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exported LUN, striping or concatenation of LUNs on the MDS and clients
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is not supported yet.
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On a server built with CONFIG_NFSD_SCSI, the pNFS SCSI volume support is
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automatically enabled if the file system is exported using the "pnfs"
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option and the underlying SCSI device support persistent reservations.
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On the client make sure the kernel has the CONFIG_PNFS_BLOCK option
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enabled, and the file system is mounted using the NFSv4.1 protocol
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version (mount -o vers=4.1).
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