mfsstatsdump(8)

NAME
mfsstatsdump - dump usage data from master stats file in csv or png format

SYNOPSIS
mfsstatsdump -f fields [-i stats_file] [-r range] [-s separator] [-p png_filename [-x chart_width] [-y chart_height]] [-hHd]

DESCRIPTION
mfsstatsdump dumps usage data from master stats file. These are the same data sets that are used to make GUI charts. Output can be either in text format (csv) or in graphical format (png). That means -p, -x and -y options are mutually exclusive with -h, -H and -d options.

MooseFS master server saves the stats file in the DATA_PATH directory - see mfsmaster.cfg(5)

  OUTPUT
Text output - text (csv) file where first column is a timestamp (or date if -d option was specified), the following column are what was specified with the -f options, formatted according to used options (none, -s and -h or -H)

Graphical output - one png file with a chart is created for every field specified with the -f option, according to the naming scheme declared with the -p option. Size may be adjusted with -x and -y options.

OPTIONS

-f  field names separated by ',' (see FIELDS section); at least one field is mandatory; if an asterisk (*) is used, all fields are dumped

-i  name of mfs binary stats file (default: default_data_path/stats.mfs)

-r  range type: 0 - short range (minute) 1 - medium range (6 minutes) 2 - long range (30 minutes) 3 - very long range (day)

-s  specify column separator (default: tabulator)

-p  optional PNG filename (field name will be added before .png; YYYY -> YYYY_FIELD.png, YYYY.png -> YYYY_FIELD.png)

-x  PNG chart width (default: 1600)

-y  PNG chart height (should be divisible by 20 - if not then it will be adjusted; default:320)

-h  "human-readable" numbers using base 2 prefixes (IEC 60027)

-H  "human-readable" numbers using base 10 prefixes (SI)

-d  show timestamps in YYYY-MM-DD HH:MM format

  FIELDS

ucpu
    User cpu usage

scpu
    System cpu usage

cpu Total cpu usage (in csv sum of scpu and ucpu, in png shows both in different colors)

delete
    Number of chunk deletions

replicate
    Number of chunk replications

statfs
    Number of statfs operations

getattr
    Number of getattr operations

setattr
    Number of setattr operations

lookup
    Number of lookup operations

mkdir
    Number of mkdir operations

rmdir
    Number of rmdir operations

symlink
    Number of symlink operations

readlink
    Number of readlink operations

mknod
    Number of mknod operations

unlink
    Number of unlink operations

rename
    Number of rename operations

link
    Number of link operations

readdir
    Number of readdir operations

open
    Number of open operations

read
    Number of read operations

write
    Number of write operations

prcvd
    Received packets

psent
    Sent packets

brcvd
    Received bytes

bsent
    Sent bytes

memoryrss
    Resident memory usage

memoryvirt
    Virtual memory usage

mem Total memory usage (in csv is the same as memoryvirt, in png shows both memoryrss and memoryvirt using two colors)

usedspace
    Used raw disk space

totalspace
    Total raw disk space

space
    Total raw disk space (in csv the same as totalspace, in png shows both usedspace and totalspace using two colors)

readchunk
    Number of chunk_read operations

writechunk
    Number of chunk_write operations

create
    Number of chunk creation attempts

change
    Number of chunk internal operation attempts

delete_ok
    Number of successful chunk deletions

delete_err
    Number of unsuccessful chunk deletions

delete_stat
    Sum of successful and unsuccessful chunk deletions (in png shows both delete_ok and delete_err using two colors)

replicate_ok
    Number of successful chunk replications

replicate_err
    Number of unsuccessful chunk replications

replicate_stat
    Sum of successful and unsuccessful chunk replications (in png shows both replicate_ok and replicate_err using two colors)

create_ok
    Number of successful chunk creations

create_err
    Number of unsuccessful chunk creations

create_stat
    Sum of successful and unsuccessful chunk creations (in png shows both create_ok and create_err using two colors)

change_ok
    Number of successful chunk internal operations

change_err
    Number of unsuccessful chunk internal operations

change_stat
    Sum of successful and unsuccessfulchunk internal operations (in png shows both change_ok and change_err using two colors)

split_ok
    Number of successful chunk split operations

split_err
    Number of unsuccessful chunk split operations

split_stat
    Sum of successful and unsuccessful chunk split operations (in png shows both split_ok and split_err using two colors)

fileobjects
    Number of file objects

metaobjects
    Number of non-file objects (directories,symlinks,etc.)

objects
    Number of all objects (in png shows both fileobjects and metaobjects using two colors)

chunksec8
    Total number of chunks stored in EC8 format

chunksec4
    Total number of chunks stored in EC4 format

chunkscopy
    Total number of chunks stored in COPY format

chunks
    Total number of chunks stored in any format (in png shows chunksec8, chunksec4 and chunkscopy using three colors)

chregdanger
    Number of endangered chunks (mark for removal excluded)

chregunder
    Number of undergoal chunks (mark for removal excluded)

regunder
    Number of endangered and undergoal chunks (mark for removal excluded, in png shows chregdanger and chregunder using two colors)

challdanger
    Number of endangered chunks (mark for removal included)

challunder
    Number of undergoal chunks (mark for removal included)

allunder
    Number of endangered and undergoal chunks (mark for removal included, in png shows challdanger and challunder using two colors)

bytesread
    Average number of bytes read per second by all clients

byteswrite
    Average number of bytes written per second by all clients

fsync
    Number of fsync operations

lock
    Number of lock operations

snapshot
    Number of snapshot operations

truncate
    Number of truncate operations

getxattr
    Number of getxattr operations

setxattr
    Number of setxattr operations

getfacl
    Number of getfacl operations

setfacl
    Number of setfacl operations

fcreate
    Number of file create operations

meta
    Number of extra metadata operations (sclass,trashretention,eattr etc.)

delay
    (pro only) Master max delay in seconds

servers
    Number of all registered chunk servers (both connected and disconnected)

dservers
    Number of all disconnected chunk servers

mdservers
    Number of disconnected chunk servers that are in maintenance mode

cservers
    Number of all registered chunk servers (in csv equals to servers, in png shows servers, dservers and mdservers using three different colors)

udiff
    Difference in space usage percent between the most and least used chunk server

NOTES

Data sets delete and delete_stat in a properly working system should be roughly the same, but not always identical (in their CSV form), this stems from the fact that the delete set is calculated using the number of requests sent by the master, and the delete_stat set is calculated using the number of replies received from chunk servers, so local fluctuations may be observed (i.e. one minute has more sent requests - higher value in the delete set and the next minute has more answers - higher value in delete_stat set). But if one were to calculate the sum of differences between the two sets over time, this sum should never grow over a certain number.

However, if there is some kind of problem (with network communication and/or chunk server process(es)) and some chunk delete requests are stalled/go missing, then delete values may be constantly higher than the delete_stat values and the sum of differences between the two sets will be steadily growing over time.

Same goes for replicate(_stat), create(_stat), change(_stat) and split(_stat) data sets.

REPORTING BUGS
Report bugs to <bugs@moosefs.com>.

COPYRIGHT
Copyright (C) 2026 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 this program; if not, see <https://www.gnu.org/licenses/>.

SEE ALSO
mfsmount(8), moosefs(7)