mfsmetadump
NAME
mfsmetadump - dump MooseFS metadata info in human readable format
SYNOPSIS
mfsmetadump [-d] [-s section_name] metadata_file
DESCRIPTION
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).
OPTIONS
-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
- metadata_file
-
path to metadata.mfs file
SECTION HEADER (precedes each section except HEAD)
- section header
-
section header (section type + version)
- length
-
length of section
- section type
-
name of section
- version
-
hexadecimal representation of section version
FILE HEADER (HEAD)
- header
-
MooseFS version
- version
-
metadata file version
- fileid
-
metadata file id
SESSIONS SECTION (SESS)
- nextsessionid
-
first free session id
- statscount
-
number of stats remembered in each session
- 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)
STORAGE CLASS SECTION (SCLA), formerly LABELS SECTION (LABS)
- LABELDESC
-
line with label description (existed only in LABS)
l label letter
n label description
- SCLASS
-
(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
- SCLASSMAIN
-
(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
- SCLASSEXPR
-
(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
PATTERNS SECTION (PATT)
- PATTERN
-
line with pattern definition
v priority
# storage class id
t trash retention
e flags (extra mfs attributes)
u uid
g gid
p pattern
NODES SECTION (NODE)
- maxinode
-
maximum inode number used by system
- hashelements
-
number of inodes in hash tabble
- NODE
-
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)
EDGES SECTION (EDGE)
- nextedgeid
-
next available edge id (descending)
- EDGE
-
line with edge description
p parent inode number
c child inode number
i edge id
n edge name
FREE NODES SECTION (FREE)
- free nodes
-
number of free (reusable) nodes
- FREEID
-
line with free inode description
i inode number
f deletion timestamp
QUOTA SECTION (QUOT)
- quota nodes
-
number of nodes with quota
- 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
XATTR SECTION (XATR)
- XATTR
-
line with xattr description
i inode number
n xattr name
v xattr value
POSIX ACL SECTION (PACL)
- POSIXACL
-
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
OPEN FILES SECTION (OPEN)
- OPENFILE
-
line with open file description
s session id
i inode number
FLOCK LOCK SECTION (FLCK)
- FLOCK
-
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)
POSIX LOCK SECTION (PLCK)
- POSIXLOCK
-
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)
CHUNKSERVERS SECTION (CSDB)
- chunk servers
-
number of chunkservers
- CHUNCKSERVER
-
line with chunk server description
i server ip
p server port
# server id
m maintenance mode
t maintenance timeout timestamp
CHUNKS SECTION (CHNK)
- nextchunkid
-
first available chunk number
- CHUNK
-
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.
REPORTING BUGS
Report bugs to bugs@moosefs.com
COPYRIGHT
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
SEE ALSO
mfsmaster(8)