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| author | Daniel W. S. Almeida <dwlsalmeida@gmail.com> | 2020-01-10 20:24:29 -0300 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2020-01-16 12:43:05 -0700 |
| commit | 26f6225fa53dc4ad26b9d9d712c0f55a92eb2c23 (patch) | |
| tree | f9d2bb1e7ddec06195e4dd09dd3b1ffc9933c862 /Documentation/filesystems/nfs | |
| parent | fbdcd0b8e56492dd85bd8d08f15a14334bb59259 (diff) | |
| download | lwn-26f6225fa53dc4ad26b9d9d712c0f55a92eb2c23.tar.gz lwn-26f6225fa53dc4ad26b9d9d712c0f55a92eb2c23.zip | |
Documentation: nfs: convert pnfs-block-server to ReST
Convert pnfs-block-server.txt to ReST and move it to admin-guide.
Content remains mostly unchanged.
Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Link: https://lore.kernel.org/r/c06903760e690c16d9df92f5e75f80381d6326d8.1578697871.git.dwlsalmeida@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/filesystems/nfs')
| -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 |