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Man Pages

Manual Reference Pages  -  MFSMOUNT (8)


mfsmount - mount Moose File System


Sugid Clear Mode
Data Cache Modes


mfsmount mountpoint [-d] [-f] [-s] [-m] [-n] [-p] [-H HOST] [-P PORT] [-S PATH] [-o opt[,opt]...]

mfsmount -h|--help

mfsmount -V|--version


Mount Moose File System.

General options:
-h, --help display help and exit
-V display version information and exit
FUSE options:
-d, -o debug
  enable debug mode (implies -f)
-f foreground operation
-s disable multi-threaded operation
MooseFS options:
-c CFGFILE, -o mfscfgfile=CFGFILE
  loads file with additional mount options
-m, --meta, -o mfsmeta
  mount MFSMETA companion filesystem instead of primary MooseFS
-n omit default mount options (-o allow_other,default_permissions)
-p prompt for password (interactive version of -o mfspassword=PASS)
-H HOST, -o mfsmaster=HOST
  connect with MooseFS master on HOST (default is mfsmaster)
-P PORT, -o mfsport=PORT
  connect with MooseFS master on PORT (default is 9421)
-B IP, -o mfsbind=IP
  local address to use for connecting with master instead of default one
-L IP, -o mfsproxy=IP
  define listen ip address of local master proxy for communication with tools (default:
-S PATH, -o mfssubfolder=PATH
  mount specified MooseFS directory (default is /, i.e. whole filesystem)
-o mfspassword=PASSWORD
  authenticate to MooseFS master with PASSWORD
-o mfsmd5pass=MD5
  authenticate to MooseFS master using directly given MD5 (only if mfspassword option is not specified)
-o mfsdonotrememberpassword
  do not remember password in memory - more secure, but when session is lost then new session is created without password
-o mfsdebug
  print some MooseFS-specific debugging information
-o mfsdelayedinit
  connection with master is done in background - with this option mount can be run without network (good for being run from fstab / init scripts etc.)
-o mfsmkdircopysgid=N
  sgid bit should be copied during mkdir operation (default depends on operating system)
-o mfssugidclearmode=SMODE
  set sugid clear mode (see SUGID CLEAR MODES; default depends on operating system)
-o mfscachemode=CMODE
  set cache mode (see DATA CACHE MODES; default is AUTO)
-o mfscachefiles
  (deprecated) preserve file data in cache (equivalent to ’-o mfscachemode=YES’)
-o mfsattrcacheto=SEC
  set attributes cache timeout in seconds (default: 1.0)
-o mfsxattrcacheto=SEC
  set extended attributes (xattr) cache timeout in seconds (default: 30.0)
-o mfsentrycacheto=SEC
  set file entry cache timeout in seconds (default: 0.0, i.e. no cache)
-o mfsdirentrycacheto=SEC
  set directory entry cache timeout in seconds (default: 1.0)
-o mfsnegentrycacheto=SEC
  set negative entry cache timeout in seconds (default: 1.0)
-o mfsgroupscacheto=SEC
  set supplementary groups cache timeout in seconds (default: 300.0)
-o mfsrlimitnofile=N
  try to change limit of simultaneously opened file descriptors on startup (default: 100000)
-o mfsnice=LEVEL
  try to change nice level to specified value on startup (default: -19)
-o mfswritecachesize=N
  specify write cache size in MiB (in range: 16..2048 - default: 250)
-o mfsreadaheadsize=N
  define size of all read ahead buffers in MiB (default: 128)
-o mfsreadaheadleng=N
  define amount of bytes to be additionaly read (default: 1048576)
-o mfsreadaheadtrigger=N
  define amount of bytes read sequentially that turns on read ahead (default: 10 * mfsreadaheadleng)
-o mfsioretries=N
  specify number of retiries before I/O error is returned (default: 30)
General mount options (see mount(8) manual):
-o rw|-o ro
  Mount file-system in read-write (default) or read-only mode respectively.
-o suid|-o nosuid
  Enable or disable suid/sgid attributes to work.
-o dev|-o nodev
  Enable or disable character or block special device files interpretation.
-o exec|-o noexec
  Allow or disallow execution of binaries.


During attribute change file systems sometimes clear flags suid and/or sgid. Behavior is different on different file systems. MFS tries to mimic behavior of most popular file system on given operating systems.
NEVER MFS will not change suid and sgid bit on chown
ALWAYS clear suid and sgid on every chown - safest operation
OSX standard behavior in OS X and Solaris (chown made by unprivileged user clear suid and sgid)
BSD standard behavior in *BSD systems (like in OSX, but only when something is really changed)
EXT standard behavior in most file systems on Linux (directories not changed, others: suid cleared always, sgid only when group exec bit is set)
XFS standard behavior in XFS on Linux (like EXT but directories are changed by unprivileged users)


There are three cache modes: NO, YES and AUTO. Default option is AUTO and you shuldn’t change it unless you really know what you are doing. In AUTO mode data cache is managed automatically by mfsmaster.
  never allow files data to be kept in cache (safest but can reduce efficiency)
  always allow files data to be kept in cache (dangerous)
AUTO file cache is managed by mfsmaster automatically (should be very safe and efficient)


Report bugs to <>.


Copyright (C) 2016 Jakub Kruszona-Zawadzki, Core Technology Sp. z o.o.

This file is part of MooseFS.

MooseFS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2 (only).

MooseFS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with MooseFS; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301, USA or visit


mfsmaster(8), mfstools(1), moosefs(7), mount(8)
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MooseFS 2.0.88-1 MFSMOUNT (8) March 2016

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