mfsmaster.cfg(5) - Linux man page

Name

Description

Syntax

Syntax is:

OPTION = VALUE

Lines starting with # character are ignored as comments.

Options

DATA_PATH

where to store metadata files and lock file

LOCK_FILE

(deprecated) daemon lock/pid file

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 mfsmaster)

LOCK_MEMORY

whether to perform mlockall() to avoid swapping out mfsmaster 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)

EXPORTS_FILENAME

alternative name of mfsexports.cfg file

TOPOLOGY_FILENAME

alternative name of mfstopology.cfg file

BACK_LOGS

number of metadata change log files (default is 50)

BACK_META_KEEP_PREVIOUS

number of previous metadata files to be kept (default is 1)

REPLICATIONS_DELAY_INIT

initial delay in seconds before starting replications (default is 300)

REPLICATIONS_DELAY_DISCONNECT

replication delay in seconds after chunkserver disconnection (default is 3600)

MATOML_LISTEN_HOST

IP address to listen on for metalogger connections (* means any)

MATOML_LISTEN_PORT

port to listen on for metalogger connections (default is 9419)

MATOCS_LISTEN_HOST

IP address to listen on for chunkserver connections (* means any)

MATOCS_LISTEN_PORT

port to listen on for chunkserver connections (default is 9420)

MATOCU_LISTEN_HOST

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

MATOCU_LISTEN_PORT

port to listen on for client (mount) connections (default is 9421)

CHUNKS_LOOP_MIN_TIME

Chunks loop shouldn't be done in less seconds than given number (default is 300)

CHUNKS_LOOP_MAX_CPS

Chunks loop shouldn't check more chunks per seconds than given number (default is 100000)

CHUNKS_SOFT_DEL_LIMIT

Soft maximum number of chunks to delete on one chunkserver (default is 10)

CHUNKS_HARD_DEL_LIMIT

Hard maximum number of chunks to delete on one chunkserver (default is 25)

CHUNKS_WRITE_REP_LIMIT

Maximum number of chunks to replicate to one chunkserver (default is 2)

CHUNKS_READ_REP_LIMIT

Maximum number of chunks to replicate from one chunkserver (default is 10)

REJECT_OLD_CLIENTS

Reject mfsmounts older than 1.6.0 (0 or 1, default is 0). Note that mfsexports access control is NOT used for those old clients.

Notes

Chunks in master are tested in loop. Speed (or frequency) is regulated by two options CHUNKS_LOOP_MIN_TIME and CHUNKS_LOOP_MAX_CPS. First defines minimal time of the loop and second maximal number of chunk tests per second. Typically at the beginning, when number of chunks is small, time is constant, regulated by CHUNK_LOOP_MIN_TIME, but when number of chunks became bigger then time of loop can increase according to CHUNKS_LOOP_MAX_CPS.

Deletion limits are defined as 'soft' and 'hard' limit. When number of chunks to delete increases from loop to loop then current limit can be temporary increased above soft limit, but never above hard limit.

Copyright

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 3.

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, see <http://www.gnu.org/licenses/>.

See Also