NAME
nilfs_cleanerd.conf - nilfs_cleanerd(8) configuration file
DESCRIPTION
The nilfs_cleanerd.conf file is the configuration file for the
nilfs_cleanerd(8) which reclaims disk space of the NILFS2 filesystem.
This file specifies the parameters related to garbage collection (GC)
and behaviour of the daemon program.
The file contains keyword argument pairs or keyword-only directives,
one per line. Lines starting with ’#’ are interpreted as comments.
The comment lines and empty lines are ignored.
PARAMETERS
The possible keywords and their meanings are as follows (keywords and
arguments are both case-sensitive):
protection_period
Specify the period during which each checkpoint is protected
from the garbage collector (in seconds). NILFS2 GC never
deletes checkpoints and their blocks whose duration time is less
than the value. The default value is 3600, meaning one hour.
min_clean_segments
Specify the minimum number of clean segments. A value of 0 means
continuous cleaning. A value greater than 0 means pause cleaning
until less than min_clean_segments are available.
max_clean_segments
Specify the maximum number of clean segments. If
min_clean_segments is 0, this value is ignored. If more than
max_clean_segments are available cleaning is paused until less
than min_clean_segments are available.
min_clean_segments and max_clean_segments may be followed by a percent
sign or the following multiplicative suffixes: kB 1000, K 1024, MB
1000*1000, M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on
for T, P, E. If the argument is followed by a percent sign, it
represents a disk capacity ratio.
The default values of min_clean_segments and max_clean_segments are 10
percent and 20 percent respectively.
clean_check_interval
Specify the interval to wait between checks of
min_clean_segments. If min_clean_segments is 0, this value is
ignored. The default value is 10.
selection_policy
Specify the GC policy. At present, only the ‘timestamp’ policy,
which reclaims segments in order from oldest to newest, is
support.
nsegments_per_clean
Specify the number of segments reclaimed by a single cleaning
step. The default value is 2.
mc_nsegments_per_clean
Specify the number of segments reclaimed by a single cleaning
step if clean segments < min_clean_segments. The default value
is 4.
cleaning_interval
Specify the cleaning interval in seconds. The default value is
5.
mc_cleaning_interval
Specify the cleaning interval in seconds if clean segments <
min_clean_segments. The default value is 1.
retry_interval
Specify retry interval in seconds. This value provides the
retry interval of GC in case of resource shortages. The default
value is 60.
use_mmap
Specify whether to use mmap(2) for reading segments. At
present, this option is enabled if supported regardless of this
directive.
log_priority
Gives the verbosity level that is used when logging messages
from nilfs_cleanerd(8). The possible values are: emerg, alert,
crit, err, warning, notice, info, and debug. The default is
info.
FILES
/etc/nilfs_cleanerd.conf
Configuration file for nilfs_cleanerd(8).
SEE ALSO
nilfs_cleanerd(8).