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3 pNFS SCSI layout server user guide 3 pNFS SCSI layout server user guide
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6 This document describes support for pNFS SCSI 6 This document describes support for pNFS SCSI layouts in the Linux NFS server.
7 With pNFS SCSI layouts, the NFS server acts as 7 With pNFS SCSI layouts, the NFS server acts as Metadata Server (MDS) for pNFS,
8 which in addition to handling all the metadata 8 which in addition to handling all the metadata access to the NFS export,
9 also hands out layouts to the clients so that 9 also hands out layouts to the clients so that they can directly access the
10 underlying SCSI LUNs that are shared with the 10 underlying SCSI LUNs that are shared with the client.
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12 To use pNFS SCSI layouts with the Linux NFS se 12 To use pNFS SCSI layouts with the Linux NFS server, the exported file
13 system needs to support the pNFS SCSI layouts 13 system needs to support the pNFS SCSI layouts (currently just XFS), and the
14 file system must sit on a SCSI LUN that is acc 14 file system must sit on a SCSI LUN that is accessible to the clients in
15 addition to the MDS. As of now the file syste 15 addition to the MDS. As of now the file system needs to sit directly on the
16 exported LUN, striping or concatenation of LUN 16 exported LUN, striping or concatenation of LUNs on the MDS and clients
17 is not supported yet. 17 is not supported yet.
18 18
19 On a server built with CONFIG_NFSD_SCSI, the p 19 On a server built with CONFIG_NFSD_SCSI, the pNFS SCSI volume support is
20 automatically enabled if the file system is ex 20 automatically enabled if the file system is exported using the "pnfs"
21 option and the underlying SCSI device support 21 option and the underlying SCSI device support persistent reservations.
22 On the client make sure the kernel has the CON 22 On the client make sure the kernel has the CONFIG_PNFS_BLOCK option
23 enabled, and the file system is mounted using 23 enabled, and the file system is mounted using the NFSv4.1 protocol
24 version (mount -o vers=4.1). 24 version (mount -o vers=4.1).
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