Provided by: moosefs-client_3.0.116-1ubuntu2_amd64 bug


       mfsmount - mount Moose File System


       mfsmount [HOST[:PORT]:[PATH]] [options] mountpoint

       mfsmount -h|--help

       mfsmount -V|--version

       Since 3.0.75 (Linux only):

       mount -t moosefs [options] [HOST[:PORT]:[PATH]] mountpoint


       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)

       -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

       -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 mfspassfile=FILENAME
              authenticate to MooseFS master with password stored in first line of  file  pointed
              by FILENAME

       -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 mfsmemlock
              try  to  lock  memory  (all allocated memory will be mapped to physical RAM - which
              also means no swapping)

       -o allowoomkiller
              do not disable out of memory killer (Linux only)

       -o mfslimitarenas=N
              if N>0 then limit glibc malloc arenas (Linux only - default: 4)

       -o mfsflattrash
              use flat trash structure in meta (option added for compatibility  reasons  -  since
              version  3.0.64 trash is split into 4096 subfolders which reduces problems with big

       -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

       -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: 0.0)

       -o mfssymlinkcacheto=SEC
              set symbolic link cache timeout in seconds (default: 300.0)

       -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:

       -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: 256)

       -o mfsreadaheadsize=N
              define size of all read ahead buffers in MiB (in range: 16..2048 - default: 256)

       -o mfsreadaheadleng=N
              define  amount  of bytes to be additionally read (in range: 128KiB..2MiB - default:

       -o mfsreadaheadtrigger=N
              define amount of bytes read sequentially that turns on read ahead  (default:  10  *

       -o mfserroronlostchunk
              when  all  known chunkservers are connected to the master and the required chunk is
              missing then immediately finish I/O and return an error

       -o mfserroronnospace
              when all known chunkservers are connected to the master and there is no free  space
              then immediately finish I/O and return an error

       -o mfsioretries=N
              specify number of retries before I/O error is returned (default: 30)

       -o mfstimeout=N
              define  maximum timeout in seconds before I/O error is returned (default: 0 - which
              means no timeout)

       -o mfslogretry=N
              define minimal retry counter on which system will start log I/O messages  (default:

       -o mfsfsyncmintime=SEC
              force  fsync  before  last  file  close  when  file was opened/created at least SEC
              seconds earlier (default: 0.0 - always do fsync before close)

       -o mfspreflabels=LABELEXPR
              specify preferred labels for choosing chunkservers during I/O

       -o mfsnoxattrs
              turn off xattr support

       -o mfsnoposixlocks
              turn off support for global posix locks (lockf + ioctl) - locks will work locally

       -o mfsnobsdlocks
              turn off support for global BSD locks (flock) - locks will work locally

       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

       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 four cache modes: DIRECT, 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.

       DIRECT forces direct io (bypasses cache)

       NO,NONE or NEVER
              never allow files data to be kept in cache (safest but can reduce efficiency)

       YES or ALWAYS
              always allow files data to be kept in cache (dangerous)

       AUTO   file cache  is  managed  by  mfsmaster  automatically  (should  be  very  safe  and


       LABELEXPR grammar:


       S          -> S + M | M

       M          -> M L | L

       L          -> a .. z | A .. Z | ( S ) | [ S ]

       Subexpressions  should be placed in priority order. Up to nine subexpressions (priorities)
       can be specified.


       On most Unix systems mfsmount can be invoked automatically from /etc/fstab. Be aware  that
       rw  or  ro  option  has  to  be specified in options. Also on many systems there should be
       option which informs the system that this mountpoint  should  be  mounted  after  starting
       networking services (options such as _netdev or late).


       mfsmount mountpoint fuse options 0 0


       mfsmount_magic mountpoint moosefs options,mountprog=/usr/local/bin/mfsmount 0 0

       Since version 3.0.75 alternative form can be used:


       HOST[:PORT]:[PATH] mountpoint moosefs options 0 0


       HOST[:PORT]:[PATH] mountpoint moosefs options,mountprog=/usr/local/bin/mfsmount 0 0


       Report bugs to <>.


       Copyright (C) 2021 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), mount(8)