NAME

       mfsmount - mount Moose File System

SYNOPSIS

       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

DESCRIPTION

       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 (default: 127.0.0.1)

       -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 trashes)

       -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: 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: 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: 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: 1048576)

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

       -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: 5)

       -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.

SUGID CLEAR MODE

       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)

DATA CACHE MODES

       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 efficient)

LABEL EXPRESSIONS

       LABELEXPR grammar:

       LABELEXPR  -> S ; LABELEXPR | S

       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.

FSTAB

       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).

       Linux:

       mfsmount mountpoint fuse options 0 0

       *BSD:

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

       Since version 3.0.75 alternative form can be used:

       Linux:

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

       *BSD:

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

REPORTING BUGS

       Report bugs to <bugs@moosefs.com>.

COPYRIGHT

       Copyright (C) 2023 Jakub Kruszona-Zawadzki, Saglabs SA

       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
       http://www.gnu.org/licenses/gpl-2.0.html

SEE ALSO

       mfsmaster(8), mfstools(1), mount(8)