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mfschunkserver.cfg(5) This is part of MooseFS mfschunkserver.cfg(5) 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. STARTUP OPTIONS Changes in this section require process restart. 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 mf- schunkserver 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 only, 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 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) CAN_USE_MMAP using mmap for allocation can slightly reduce ram usage and give a silight performance boost, but on certain architectures/kernels can lead to problems - especially on architectures with more than one physical CPU; default is 0 RUNTIME OPTIONS Changes in this section require only process reload. HDD_CONF_FILENAME alternate location/name of mfshdd.cfg file HDD_TEST_SPEED Speed of background chunk tests in MB/s per disk (formally entry de- fined in mfshdd.cfg). Value can be given as a decimal number; de- fault 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 ago; default is 1 day; for value formatting see TIME 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_FAD- VISE_MIN_TIME 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 systems that support posix_fadivise; default is 1 day; for value formatting see TIME HDD_LEAVE_SPACE_DEFAULT how much space should be left unused on each hard drive; number for- mat: [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 zeroz) 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 algo- rithms, 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 (de- fault is one week); changing this value and reloading will reset the counter; for value formatting see TIME WORKERS_MAX, WORKERS_MAX_IDLE maximum number of active workers and maximum number of idle workers; defaults are 250 and 40 SYSLOG_MIN_LEVEL minimum level of messages that will be reported by chunkserver; lev- els in order of importance: ERROR, WARNING, NOTICE, INFO, DEBUG (de- fault is INFO) SYSLOG_ELEVATE_TO reported messages of level lower than set by this option will be el- evated to this level (i.e. if SYSLOG_MIN_LEVEL is set to DEBUG and SYSLOG_ELEVATE_TO is set to NOTICE, all INFO and DEBUG messages will be sent to syslog as NOTICE ; default is NOTICE) MASTER CONNECTION OPTIONS Changes in this section require only process reload. LABELS labels string defined as a set of letters (case insensitive) sepa- rated by coma or semicolon; default is empty - no labels BIND_HOST local address to use for master connections; default is *, i.e. de- fault local address MASTER_HOST MooseFS master host, IP is allowed only in single-master installa- tions; default is mfsmaster MASTER_PORT MooseFS master command port; default is 9420 MASTER_CONTROL_PORT (pro only) 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 discon- nection (default is 5) AUTH_CODE authentication string (used only when master requires authorization) CHUNKS_PER_REGISTER_PACKET maximum number of chunks system will try to put in a single register message (default is 1000, limits 100-10000) CLIENTS CONNECTION OPTIONS Changes in this section require only process reload. 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) NOTES TIME For config variables that define time without requiring a single, specific unit, time can be defined as a number of seconds (integer) or a time period in one of two possible formats: first format: #.#T where T is one of: s-seconds, m-minutes, h-hours, d-days or w-weeks; fractions of seconds will be rounded to full seconds second format: #w#d#h#m#s, any number of definitions can be omitted, but the remaining definitions must be in order (so #d#m is still a valid defin- ition, but #m#d is not); ranges: s,m: 0 to 59, h: 0 to 23, d: 0 t o 6, w is unlimited and the first definition is also always unlimited (i.e. for #d#h#m d will be unlimited) Notice! For variable HDD_KEEP_DUPLICATES_HOURS only h,d and w time units are accepted and a value without a time unit is treated as hours; fractions are rounded to full hours. Examples: 1.5h is the same as 1h30m, is the same as 90m, is the same as 5400s, is the same as 5400 2.5d is the same as 2d12h, is the same as 60h; 1d36h is not a valid time period (h is not the first definition, so it is bound by range 0 to 23) 1.03m is the same as 62s (61.8 seconds will be rounded up to 62) 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 Soft- ware 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 de- tails. 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 mfschunkserver(8), mfshdd.cfg(5) MooseFS 4.59.1-1 May 2026 mfschunkserver.cfg(5)
NAME | DESCRIPTION | SYNTAX | NOTES | COPYRIGHT | SEE ALSO
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