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Diffstat (limited to 'Documentation/filesystems/nfs/pnfs-scsi-server.txt')
| -rw-r--r-- | Documentation/filesystems/nfs/pnfs-scsi-server.txt | 23 |
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diff --git a/Documentation/filesystems/nfs/pnfs-scsi-server.txt b/Documentation/filesystems/nfs/pnfs-scsi-server.txt new file mode 100644 index 000000000000..5bef7268bd9f --- /dev/null +++ b/Documentation/filesystems/nfs/pnfs-scsi-server.txt @@ -0,0 +1,23 @@ + +pNFS SCSI layout server user guide +================================== + +This document describes support for pNFS SCSI layouts in the Linux NFS server. +With pNFS SCSI layouts, the NFS server acts as Metadata Server (MDS) for pNFS, +which in addition to handling all the metadata access to the NFS export, +also hands out layouts to the clients so that they can directly access the +underlying SCSI LUNs that are shared with the client. + +To use pNFS SCSI layouts with with the Linux NFS server, the exported file +system needs to support the pNFS SCSI layouts (currently just XFS), and the +file system must sit on a SCSI LUN that is accessible to the clients in +addition to the MDS. As of now the file system needs to sit directly on the +exported LUN, striping or concatenation of LUNs on the MDS and clients +is not supported yet. + +On a server built with CONFIG_NFSD_SCSI, the pNFS SCSI volume support is +automatically enabled if the file system is exported using the "pnfs" +option and the underlying SCSI device support persistent reservations. +On the client make sure the kernel has the CONFIG_PNFS_BLOCK option +enabled, and the file system is mounted using the NFSv4.1 protocol +version (mount -o vers=4.1). |