On 13 Jun 2019, at 11:30, Goetz, Patrick G wrote:
Every so often I hunt for documentation on how to set up pNFS and can
never find anything. Can someone point me to something that I can use
to test this myself?
The file Documentation/filesystems/nfs/pnfs-scsi-server.txt in the
kernel
source tree is probably the best source of current documentation, if
very
concise:
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).
Should we have more than this?
Ben
