mfsmetadump(8) This is part of MooseFS mfsmetadump(8)

mfsmetadump - dump MooseFS metadata info in human readable format

mfsmetadump [-d] [-s section_name] metadata_file

mfsmetadump dumps MooseFS metadata info in human readable format. Output consists of several sections with different types of information. Every section consist of header data - rows starting with hash (#) sign - and content data (may be empty).

-d - replace all non-printable characters (codes < 32 and > 126) with '.' (it was default behaviour in version < 3.0.110).

-s - dump only specified section of the file. Possible sections:

HEAD - header info
SESS - client sessions
LABS - labels (not used)
SCLA - storage classes
PATT - pattern overrides
NODE - tree nodes (i-nodes)
EDGE - tree edges (file names)
FREE - free nodes (deleted i-nodes)
QUOT - quota definitions
XATR - xattr data
PACL - posix acl data
OPEN - open files
FLCK - flock data
PLCK - posix locks (lockf,ioctl) data
CSDB - active chunkservers
CHNK - chunks
path to metadata.mfs file

section header (section type + version)
length of section
name of section
hexadecimal representation of section version

MooseFS version
metadata file version
metadata file id

first free session id
number of stats remembered in each session
line describing a single session 
s	session id
e	exports checksum
p	IP address
r	root inode number
f	session flags
u	umask
g	min and max goal (redundancy level)
t	min and max trash retention
m	maproot uid,gid and mapall uid,gid
x	disabled operations
d	disconnection time (optional)
c	current hour stats data
l	last hour stats data
i	session name (usually local mount point)

line with label description (existed only in LABS) 
l	label letter
n	label description
(formerly LABELSET) line with storage class used in system 
#	storage class id
x	admin only
m	mode
d	arch delay
c	create labels
k	keep labels
a	archive labels
n	name
(used in version 4.0+ instead of SCLASS) line with common parameters of storage class 
#	storage class id
x	admin only
m	create mode
a	arch mode
d	arch delay
t	min trash retention
n	name
(used in version 4.0+ instead of SCLASS) line with label expression 
#	storage class id
t	type ([C]reate,[K]eep,[A]rchive or [T]rash)
e	expression

line with pattern definition 
v	priority
#	storage class id
t	trash retention
e	flags (extra mfs attributes)
u	uid
g	gid
p	pattern

maximum inode number used by system
number of inodes in hash tabble
line with node (inode) description 
k	node type (-,D,S,F,B,C,L,T,R)
	-	file
	D	directory
	S	socket
	F	fifo
	B	block device
	C	character device
	L	symbolic link
	T	trash file
	R	sustained file (removed open file)
i	inode number
#	storage class id
e	flags (extra mfs attributes)
w	windows attributes
m	mode
u	uid
g	gid
a,m,c	atime, mtime, ctime
t	trash retention
d	rdevhi,rdevlo (only block and character devices)
p	path (only symbolic links)
l	file length (only files)
c	chunk list (only files)
r	sessions that have this file open (only files)

next available edge id (descending)
line with edge description 
p	parent inode number
c	child inode number
i	edge id
n	edge name

number of free (reusable) nodes
line with free inode description 
i	inode number
f	deletion timestamp

number of nodes with quota
line with quota description 
i	inode number
g	grace period
e	exceeded
f	flags
s	soft quota exceeded timestamp
si	soft inode quota
hi	hard inode quota
sl	soft length quota
hl	hard length quota
ss	soft size quota
hs	hard size quota
sr	soft real size quota
hr	hard real size quota

line with xattr description 
i	inode number
n	xattr name
v	xattr value

line with acl description 
i	inode number
t	acl type
u	user (file owner) permissions
g	group permissions
o	other permissions
m	permission mask
n	named permissions - list of objects:
u(U):P	permissions P for user with uid U
g(G):P	permissions P for group with gid G

line with open file description 
s	session id
i	inode number

line with flock-lock description 
i	inode number
s	session id
o	lock owner (FUSE lock owner)
t	lock type ('R' - shared lock, 'W' - exclusive lock)

line with posix-lock description 
i	inode number
s	session id
o	lock owner (FUSE lock owner)
p	local process id (owner pid)
r	lock range in format <START,END)
t	lock type ('R' - shared lock, 'W' - exclusive lock)

number of chunkservers
line with chunk server description 
i	server ip
p	server port
#	server id
m	maintenance mode
t	maintenance timeout timestamp

first available chunk number
line with chunk description 
i	chunk number
v	chunk version
t	timestamp, if in the future, means lock timestamp, if in the past, last modification timestamp
a	archive flag
(s,#)	list of entries, s is storage class id, # is number of files in this storage class containing this chunk
c	calculated storage class id (effecitvely used class id, if a chunk has more than one)

NOTICE! If a chunk's timestamp equals 0, it means the chunk was created by MooseFS version older than 4.45.0 and has not been locked or modified since.

Report bugs to <bugs@moosefs.com>.

Copyright (C) 2024 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

mfsmaster(8)

September 2024 MooseFS 4.56.6-1