NAME

       vfs_glusterfs - Utilize features provided by GlusterFS

SYNOPSIS

       vfs objects = glusterfs

DESCRIPTION

       This VFS module is part of the samba(8) suite.

       GlusterFS (http://www.gluster.org) is an Open Source clustered file system capable of
       scaling to several peta-bytes. With its FUSE based native client, GlusterFS is available
       as a POSIX compliant file system and can hence be shared by Samba without additional
       steps.

       The vfs_glusterfs VFS module provides an alternative, and superior way to access a Gluster
       filesystem from Samba for sharing. It does not require a Gluster FUSE mount but directly
       accesses the GlusterFS daemon through its library libgfapi, thereby omitting the expensive
       kernel-userspace context switches and taking advantage of some of the more advanced
       features of GlusterFS.

       This module can be combined with other modules, but it should be the last module in the
       vfs objects list. Modules added to this list to the right of the glusterfs entry may not
       have any effect at all.

CONFIGURATION

       A basic configuration looks like this.

                     [share]
                     vfs objects = glusterfs
                     path = /relative/base/path
                     glusterfs:volume = gv0
                     kernel share modes = no

       Note that since vfs_glusterfs does not require a Gluster mount, the share path is treated
       differently than for other shares: It is interpreted as the base path of the share
       relative to the gluster volume used. Because this is usually not at the same time a system
       path, in a ctdb cluster setup where ctdb manages Samba, you need to set
       CTDB_SAMBA_SKIP_SHARE_CHECK=yes in ctdb's configuration file. Otherwise ctdb will not get
       healthy.

       Note that currently kernel share modes have to be disabled in a share running with the
       glusterfs vfs module for file serving to work properly.

OPTIONS

       glusterfs:logfile = path
           Defines whether and where to store a vfs_glusterfs specific logfile. Client variable
           substitution is supported (i.e. %M, %m, %I), hence per client log file can be
           specified.

           Example: glusterfs:logfile = /var/log/samba/glusterfs-vol2.%M.log

       glusterfs:loglevel = 0-9
           Defines the level of logging, with higher numbers corresponding to more verbosity. 0 -
           No logs; 9 - Trace log level; 7 being the info log level is preferred.

           If this option is not defined with an explicit loglevel, the glusterfs default is used
           (currently loglevel 7).

       glusterfs:volfile_server = servername
           Defines which volfile server to use, defaults to localhost. It could be list of white
           space separated elements where each element could be

           1. unix+/path/to/socket/file

           2. [tcp+]IP|hostname|\[IPv6\][:port]

           Note the restriction on naming a IPv6 host, it follows the same restriction that is
           based on IPv6 naming in URL as per RFC 2732.

       glusterfs:volume = volumename
           Defines the glusterfs volumename to use for this share.

CAVEATS

       The GlusterFS write-behind performance translator, when used with Samba, could be a source
       of data corruption. The translator, while processing a write call, immediately returns
       success but continues writing the data to the server in the background. This can cause
       data corruption when two clients relying on Samba to provide data consistency are
       operating on the same file.

       The write-behind translator is enabled by default on GlusterFS. The vfs_glusterfs plugin
       will check for the presence of the translator and refuse to connect if detected. Please
       disable the write-behind translator for the GlusterFS volume to allow the plugin to
       connect to the volume. The write-behind translator can easily be disabled via calling

                                   gluster volume set <volumename> performance.write-behind off

       on the commandline.

       With GlusterFS versions >= 9, we silently bypass write-behind translator during initial
       connect and failure is avoided.

VERSION

       This man page is part of version 4.17.7-Ubuntu of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba
       is now developed by the Samba Team as an Open Source project similar to the way the Linux
       kernel is developed.