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mfsmount - mount Lizard File System


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

mfsmount -h|--help

mfsmount -V|--version


Mount Lizard File System.

General options:

-h, --help
display help and exit

display version information and exit

FUSE options:

-d, -o debug
enable debug mode (implies -f)

foreground operation

disable multi-threaded operation

LizardFS options:

-c CFGFILE, -o mfscfgfile=CFGFILE
loads file with additional mount options

-m, --meta, -o mfsmeta
mount MFSMETA companion filesystem instead of primary LizardFS

omit default mount options (-o allow_other,default_permissions)

prompt for password (interactive version of -o mfspassword=PASS)

-H HOST, -o mfsmaster=HOST
connect with LizardFS master on HOST (default is mfsmaster)

-P PORT, -o mfsport=PORT
connect with LizardFS master on PORT (default is 9421)

-B HOST, -o mfsbind=HOST
local address to use for connecting with master instead of default one

-S PATH, -o mfssubfolder=PATH
mount specified LizardFS directory (default is /, i.e. whole filesystem)

-o enablefilelocks=[0,1]
enables/disables global file locking (disabled by default)

-o mfspassword=PASSWORD
authenticate to LizardFS master with PASSWORD

-o mfsmd5pass=MD5
authenticate to LizardFS master using directly given MD5 (only if mfspassword option
is not specified)

-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 mfsacl
enable ACL support (disabled by default)

-o mfsaclcacheto=SEC
set ACL cache timeout in seconds (default: 1.0)

-o mfsaclcachesize=N
define ACL cache size in number of entries (0: no cache; default: 1000)

-o mfsrwlock=0|1
when set to 1, parallel reads from the same descriptor are performed (default: 1)

-o mfsmkdircopysgid=N
sgid bit should be copied during mkdir operation (on linux default: 1, otherwise: 0)

-o mfssugidclearmode=SMODE
set sugid clear mode (see below)

-o mfsdebug
print some LizardFS-specific debugging information

-o mfscachemode=CACHEMODE
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 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 mfswritecachesize=N
specify write cache size in MiB (in range: 16..2048 - default: 128)

-o mfscacheperinodepercentage=N
specify what part of the write cache non occupied by other inodes can a single inode
occupy (measured in %). E.g. When N=75 and the inode X uses 10 MiB, and all other
inodes use 20 MiB out of 100 MiB cache, X can use 50 MiB more (since 75% of 80 MiB is
60 MiB). Default: 25.

-o mfschunkserverreadto=MSEC
set timeout for whole communication with a chunkserver during read operation in
milliseconds (default: 2000)

-o mfschunkserverwriteto=MSEC
set chunkserver response timeout during write operation in milliseconds (default:

-o mfschunkserverrtt=MSEC
set timeout after which SYN packet is considered lost during the first retry of
connecting a chunkserver (default: 200)

-o mfschunkserverconnectreadto=MSEC
set timeout for connecting with chunkservers during read operation in milliseconds
(default: 2000)

-o mfschunkserverbasicreadto=MSEC
set timeout for executing the basic variant of a read operation in milliseconds
(default: 2000)

-o mfschunkservertotalreadto=MSEC
set timeout for the whole communication with chunkservers during a read operation in
milliseconds (default: 2000)

-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 mfswriteworkers=N
define number of write workers (default: 10)

-o mfswritewindowsize=N
define write window size (in blocks) for each chunk (default: 15)

-o mfsmemlock
try to lock memory (must be enabled at build time)

-o mfsdonotrememberpassword
do not remember password in memory - more secure, but when session is lost then new
session is created without password

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

-o mfsreportreservedperiod=N
specify interval of reporting reserved inodes in seconds (default: 60)

-o mfsiolimits=PATH
specify local I/O limiting configuration file (default: no I/O limiting)

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.

-o symlinkcachetimeout=N
Set timeout value for symlink cache timeout in seconds. Default value is 3600.


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)

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


SMODE can be set to:

· 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)

SMODE extra info:

btrfs,ext2,ext3,ext4,hfs[+],jfs,ntfs and reiserfs on Linux work as EXT.

Only xfs on Linux works a little different. Beware that there is a strange operation -
chown(-1,-1) which is usually converted by a kernel into something like chmod ug-s, and
therefore can’t be controlled by MFS as chown


Report bugs to <[email protected]>.


Copyright 2008-2009 Gemius SA, 2013-2015 Skytechnology sp. z o.o.

LizardFS 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 3.

LizardFS 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 LizardFS. If
not, see http://www.gnu.org/licenses/.

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