25 lines
1.2 KiB
ReStructuredText
25 lines
1.2 KiB
ReStructuredText
|
|
==================================
|
|
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 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).
|