NAME

       mfschunkserver.cfg - main configuration file for mfschunkserver

DESCRIPTION

       The file mfschunkserver.cfg contains configuration of MooseFS chunkserver process.

SYNTAX

       Syntax is:

       OPTION = VALUE

       Lines starting with # character are ignored as comments.

OPTIONS

       Configuration options:

       WORKING_USER
              user to run daemon as

       WORKING_GROUP
              group to run daemon as; optional value - if empty then default user group will be used

       SYSLOG_IDENT
              name of process to place in syslog messages; default is mfschunkserver

       LOCK_MEMORY
              whether to perform mlockall() to avoid swapping out mfschunkserver process; default is 0, i.e. no

       LIMIT_GLIBC_MALLOC_ARENAS
              limit  malloc  arenas  to  given  value - prevents server from using huge amount of virtual memory
              (Linux onty, default is 4)

       DISABLE_OOM_KILLER
              disable out of memory killer (Linux only, default is 1)

       NICE_LEVEL
              nice level to run daemon with; default is -19; note: process must be started as root  to  increase
              priority, if setting of priority fails, process retains the nice level it started with

       FILE_UMASK
              set default umask for group and others (user has always 0); default is 027 - block write for group
              and block all for others

       DATA_PATH
              where to store daemon lock file

       HDD_CONF_FILENAME
              alternate location/name of mfshdd.cfg file

       HDD_TEST_FREQ
              This option is deprecated. Please define HDD_TEST_SPEED instead. If HDD_TEST_SPEED is not  defined
              then  system  will  try  to use HDD_TEST_FREQ but will convert it to HDD_TEST_SPEED using formula:
              HDD_TEST_SPEED = 10 / HDD_TEST_FREQ

       HDD_TEST_SPEED
              Speed of background chunk tests in MB/s per disk (formally entry defined in mfshdd.cfg). Value can
              be given as a decimal number; default is 1.0

       HDD_MIN_TEST_INTERVAL
              prevents  from  testing  chunk  integrity  when  last I/O (including test) was performed less than
              HDD_MIN_TEST_INTERVAL seconds ago; default is 86400

       HDD_FADVISE_MIN_TIME
              If possible use posix_fadvise(POSIX_DONTNEED)  after  each  chunk  test  (but  only  if  last  I/O
              operation  was  performed  more  than  HDD_FADVISE_MIN_TIME  seconds  ago). Using zero will always
              perform posix_fadvise (flush cache) and using negative value will never flush cache  after  tests.
              This setting is valid only for system s that support posix_fadivise; default value is 86400

       HDD_LEAVE_SPACE_DEFAULT
              how    much    space    should   be   left   unused   on   each   hard   drive;   number   format:
              [0-9]*(.[0-9]*)?([kMGTPE]|[KMGTPE]i)?B? ; default is 256MiB; examples: 0.5GB, .5G, 2.56GiB,  1256M
              etc.

       HDD_REBALANCE_UTILIZATION
              percent  of  total work time the chunkserver is allowed to spend on hdd space rebalancing; default
              is 20

       HDD_HIGH_SPEED_REBALANCE_LIMIT
              maximum simultaneous writes per disk in high speed disk rebalance (0 means use standard rebalance;
              default is 0)

       HDD_ERROR_TOLERANCE_COUNT, HDD_ERROR_TOLERANCE_PERIOD
              how  many  i/o  errors  (COUNT)  to  tolerate in given amount of seconds (PERIOD) on a single hard
              drive; if the number of errors exceeds this setting, the offending hard drive will  be  marked  as
              damaged; defaults are 2 and 600

       HDD_FSYNC_BEFORE_CLOSE
              enables/disables fsync before chunk closing; default is 0 (off)

       HDD_SPARSIFY_ON_WRITE
              enables/disables  sparsification  (skip  leading  and  trailing  zeros)  during writing new block;
              default is 1 (on)

       HDD_RR_CHUNK_COUNT
              how many chunks should be created in one directory before moving to the next  one;  higher  values
              are  better  with  most  OSes caching algorithms, low values lead to more even chunk distribution;
              default is 10000 which works best in most cases

       HDD_KEEP_DUPLICATES_HOURS
              how many hours duplicate chunks should be kept before  deleting  (default  is  168  -  one  week);
              changign this value and reloading will reset the counter

       ALLOW_STARTING_WITH_INVALID_DISKS
              when  set  to  one  chunkserver  will  not  abort  start  even when incorrect entries are found in
              'mfshdd.cfg' file; default is 0 (do not start with invalid entries)

       WORKERS_MAX, WORKERS_MAX_IDLE
              maximum number of active workers and maximum number of idle workers; defaults are 250 and 40

       LABELS labels string defined as a set of letters (case  insensitive)  separated  by  coma  or  semicolon;
              default is empty - no labels

       BIND_HOST
              local address to use for master connections; default is *, i.e. default local address

       MASTER_HOST
              MooseFS master host, IP is allowed only in single-master installations; default is mfsmaster

       MASTER_PORT
              MooseFS master command port; default is 9420

       MASTER_CONTROL_PORT
              MooseFS master control port; default is 9419

       MASTER_TIMEOUT
              timeout  in seconds for master connections (if not 0); If this value is zero then chunkserver sets
              it initially to 10 and asks master for this value. default is 0 (ask master).

       MASTER_RECONNECTION_DELAY
              delay in seconds before trying to reconnect to master after disconnection (default is 5)

       AUTH_CODE
              authentication string (used only when master requires authorization)

       BIND_HOST
              local address to use for connecting with master (default is *, i.e. default local address)

       CHUNKS_PER_REGISTER_PACKET
              maximum number of chunks system will try to put in a single register message  (default  is  10000,
              limits 1000-100000)

       CSSERV_LISTEN_HOST
              IP address to listen on for client (mount) connections (* means any)

       CSSERV_LISTEN_PORT
              port to listen on for client (mount) connections (default is 9422)

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

       mfschunkserver(8), mfshdd.cfg(5)