MFSCHUNKSERVER.CFG(5) - Linux man page online | File formats

Main configuration file for *mfschunkserver*.



mfschunkserver.cfg - main configuration file for *mfschunkserver*


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


Syntax is: OPTION = VALUE Lines starting with # character are ignored.


Configuration options: DATA_PATH where to store files with usage statistics and daemon lock file LABEL the label of this chunkserver (for tiering) WORKING_USER user to run daemon as WORKING_GROUP group to run daemon as (optional - 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) NICE_LEVEL nice level to run daemon with (default is -19 if possible; note: process must be started as root to increase priority) MASTER_HOST address of LizardFS master host to connect with (default is mfsmaster) MASTER_PORT number of LizardFS master port to connect with (default is 9420) MASTER_RECONNECTION_DELAY delay in seconds before trying to reconnect to the master server after disconnection (default is 5) MASTER_TIMEOUT timeout (in seconds) for the master server connection (default is 60, minimum is 0.01) BIND_HOST local address to use for connecting with the master server (default is *, i.e. default local address) 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) CSSERV_TIMEOUT timeout (in seconds) for client (mount) connections (default is 5) HDD_CONF_FILENAME alternative name of mfshdd.cfg file HDD_LEAVE_SPACE_DEFAULT free space threshold to set volume as 100% utilized when there is less than given amount of free space left (default is "4GiB"). This number is always added to the used disk space reported by chunkserver. HDD_TEST_FREQ chunk test period in seconds (default is 10) HDD_ADVISE_NO_CACHE whether to remove each chunk from page when closing it to reduce cache pressure generated by chunkserver (default is 1, i.e. yes) HDD_PUNCH_HOLES if enabled then chunkserver detects zero values in chunk data and frees corresponding file blocks (decreasing file system usage). This option works only on Linux with file systems supporting punching holes (XFS, ext4, Btrfs, tmpfs) (default is 1, i.e. yes) ENABLE_LOAD_FACTOR if enabled, chunkserver will send periodical reports of its I/O load to master, which will be taken into consideration when picking chunkservers for I/O operations. REPLICATION_BANDWIDTH_LIMIT_KBPS limit how many kilobytes can be replicated from other chunkservers to this chunkserver in every second (by default undefined, i.e. no limits) NR_OF_NETWORK_WORKERS number of threads which handle (in a round-robin manner) connections with clients (default is 1); these threads are responsible for reading from sockets and coping data from internal buffers to sockets NR_OF_HDD_WORKERS_PER_NETWORK_WORKER number of threads that each network worker may use to do disk operations like opening chunks, reading or writing them (default is 2) READ_AHEAD_KB additional number of kilobytes which should be passed to posix_fadvise(POSIX_FADV_WILLNEED) before reading data from a chunk (default is 0, i.e. use posix_fadvise only with the amount of data that is really needed; the value is aligned down to 64 KiB) MAX_READ_BEHIND_KB try to fix out-of-order read requests; the value tells how much of skipped data to read if an offset of some read operation is greater than the offset where the previos operation finished (default is 0, i.e. don’t read any skipped data; the value is aligned down to 64 KiB) CREATE_NEW_CHUNKS_IN_MOOSEFS_FORMAT whether to create new chunks in the MooseFS format (signature + <checksum>* + <data block>*) or in the newer interleaved format ([<checksum> <data block>]*). (Default is 1, i.e. new chunks are created in MooseFS format) PERFORM_FSYNC call fsync() after a chunk is modified (default is 1, i.e. enabled) REPLICATION_TOTAL_TIMEOUT_MS total timeout for single replication operation. Replications that take longer than that are considered failed and are immediately aborted (default: 60000) REPLICATION_CONNECTION_TIMEOUT_MS connection for single replication operation. If connecting to another chunkserver takes longer than this timeout, the operation is considered failed and is immediately aborted (default: 1000) REPLICATION_WAVE_TIMEOUT_MS, ADVANCED timeout for single wave in replication. After this timeout, next wave of read requests is sent to other chunkservers (default: 500)
Copyright 2008-2009 Gemius SA, 2013-2015 Skytechnology sp. z o.o. LizardFS 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 3. LizardFS 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 LizardFS. If not, see


mfschunkserver(8), mfshdd.cfg(5)
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mfschunkserver.cfg(5) referred by mfschunkserver(8) | mfsgoals.cfg(5) | mfshdd.cfg(5)
refer to mfschunkserver(8) | mfshdd.cfg(5)
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