1cache-clean(1) NorduGrid ARC cache-clean(1)
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6 cache-clean - Administration tool for the A-REX cache.
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10 cache-clean [-h] [-s] [-m NN -M NN] [-E N] [-D debug_level]
11 [ -c <arex_config_file> | <dir1> [<dir2> [...]] ]
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14 cache-clean is a tool for administrators of ARC server installations to
15 safely remove A-REX cache data and to provide an overview of the con‐
16 tents of the cache. It is used by the A-REX to automatically manage
17 cache contents.
18 There are two modes of operation - printing statistics and deleting
20 files. If -s is used, then statistics are printed on each cache. If -m
21 and -M are used then files in each cache are deleted if the free space
22 on the file system is less than that given by -m, in the order of least
23 recently accessed, until the free space is equal to what is specified
24 by -M. If -E is used, then all files accessed less recently than the
25 given time are deleted. -E can be used in combination with -m and -M
26 but deleting files using -E is carried out first. If after this the
27 cache free space is still less than that given by -m then cleaning
28 according to those options is performed. Cache directories are given by
29 dir1, dir2.. or taken from the config file specified by -c or the
30 ARC_CONFIG environment variable.
31 -h - print short help
33 -s - print cache statistics, without deleting anything. The output dis‐
35 plays for each cache the number of deletable (and locked) files, the
36 total size of these files, the percentage usage of the file system in
37 which the cache is stored, and a histogram of access times of the files
38 in the cache.
39 -m - the minimum free space (as % of the file system) at which to start
41 cleaning
42 -M - the minimum free space (as % of the file system) at which to stop
44 cleaning
45 -E - files accessed less recently than the given time period will be
47 deleted. Example values of this option are 1800, 90s, 24h, 30d. The
48 default when no suffix is given is seconds.
49 -D - debug level. Possible values are FATAL, ERROR, WARNING, INFO, VER‐
51 BOSE or DEBUG. Default level is INFO.
52 -c - path to an A-REX config file, xml or ini format
54 This tool is run periodically by the A-REX to keep the size of each
56 cache within the limits specified in the configuration file. Therefore
57 cleaning should not be performed manually, unless the cache size needs
58 to be reduced temporarily. For performance reasons it may however be
59 desirable to run cache-clean independently on the machine hosting the
60 cache file system, if this is different from the A-REX host. The most
61 useful function for administrators is to give an overview of the con‐
62 tents of the cache, using the -s option.
63 Within each cache directory specified in the configuration file, there
65 is a subdirectory for data (data/) and one for per-job hard links
66 (joblinks/). See the A-REX Administration Guide for more details.
67 cache-clean should only operate on the data subdirectory, therefore
68 when giving dir arguments they should be the top level cache directory.
69 cache-clean will then automatically only look at files within the data
70 directory.
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75 cache-clean -m20 -M30 -E30d -D VERBOSE -c /etc/arc.conf
76 Cache directories are taken from the configuration file /etc/arc.conf
78 and all cache files accessed more than 30 days ago are deleted. Then if
79 the free space in a cache is below 20%, data is deleted until the free
80 space reaches 30%. Verbose debug output is enabled so information is
81 output on each file that is deleted.
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85 APACHE LICENSE Version 2.0
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89 David Cameron <cameron@ndgf.org>
90NorduGrid ARC 1.1.0 2011-10-24 cache-clean(1)