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Diffstat (limited to 'Documentation/filesystems/nfs/pnfs-block-server.txt')
| -rw-r--r-- | Documentation/filesystems/nfs/pnfs-block-server.txt | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/Documentation/filesystems/nfs/pnfs-block-server.txt b/Documentation/filesystems/nfs/pnfs-block-server.txt deleted file mode 100644 index 2143673cf154..000000000000 --- a/Documentation/filesystems/nfs/pnfs-block-server.txt +++ /dev/null @@ -1,37 +0,0 @@ -pNFS block layout server user guide - -The Linux NFS server now supports the pNFS block layout extension. In this -case 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 to directly access the underlying block devices that are -shared with the client. - -To use pNFS block layouts with with the Linux NFS server the exported file -system needs to support the pNFS block layouts (currently just XFS), and the -file system must sit on shared storage (typically iSCSI) that is accessible -to the clients in addition to the MDS. As of now the file system needs to -sit directly on the exported volume, striping or concatenation of -volumes on the MDS and clients is not supported yet. - -On the server, pNFS block volume support is automatically if the file system -support it. On the client make sure the kernel has the CONFIG_PNFS_BLOCK -option enabled, the blkmapd daemon from nfs-utils is running, and the -file system is mounted using the NFSv4.1 protocol version (mount -o vers=4.1). - -If the nfsd server needs to fence a non-responding client it calls -/sbin/nfsd-recall-failed with the first argument set to the IP address of -the client, and the second argument set to the device node without the /dev -prefix for the file system to be fenced. Below is an example file that shows -how to translate the device into a serial number from SCSI EVPD 0x80: - -cat > /sbin/nfsd-recall-failed << EOF -#!/bin/sh - -CLIENT="$1" -DEV="/dev/$2" -EVPD=`sg_inq --page=0x80 ${DEV} | \ - grep "Unit serial number:" | \ - awk -F ': ' '{print $2}'` - -echo "fencing client ${CLIENT} serial ${EVPD}" >> /var/log/pnfsd-fence.log -EOF |