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diff -ur sysstat-10.1.5.orig/man/sysstat.in sysstat-10.1.5/man/sysstat.in
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--- sysstat-10.1.5.orig/man/sysstat.in 2010-09-22 22:07:29.000000000 +0200
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+++ sysstat-10.1.5/man/sysstat.in 2014-09-01 22:50:58.614499671 +0200
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@@ -11,17 +11,99 @@
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configure sysstat logging.
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The variables and their meanings are:
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.TP
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+.B COMPRESSAFTER
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+Number of days after which daily data files are to be compressed.
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+The compression program is given in the
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+.B ZIP
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+variable.
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+
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+.TP
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.B HISTORY
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The number of days during which a daily data file or a report
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should be kept. Data files or reports older than this number of
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days will be removed by the
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.BR sa2 (8)
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shell script.
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+Data files and reports are normally saved in the @SA_DIR@ directory,
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+under the name
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+.IR saDD
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+(for data files) or
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+.IR sarDD
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+(for reports), where the DD parameter indicates the current day.
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-.TP
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-.B COMPRESSAFTER
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-Number of days after which daily data files are to be compressed,
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-either by gzip or bzip2.
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+The number of files actually kept in the @SA_DIR@ directory may be
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+slightly higher than the
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+.B HISTORY
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+value due to the way the
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+.B sa2
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+script figures
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+out which files are to be removed (see below "How the
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+.BR sa2 (8)
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+script applies
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+.B HISTORY
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+value"). Using a value of 28 keeps a whole month's worth of data.
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+
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+How the
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+.BR sa2 (8)
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+script applies
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+.B HISTORY
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+value
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+
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+The
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+.B sa2
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+script uses the "find" command with the "-mtime" option to figure
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+out which files are to be removed. The "find" command interprets this value
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+as "N 24 hour periods", ignoring any fractional part. This means that the
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+last modified time of a given sa[r]DD data or report file, using a
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+.B HISTORY
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+of 1, has to have been modified at least two days ago before it will be
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+removed. And for a
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+.B HISTORY
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+of 28 that would mean 29 days ago.
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+
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+To figure out how a
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+.B HISTORY
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+of 28 is applied in practice, we need to
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+consider that the
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+.B sa2
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+script that issues the "find" command to remove the
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+old files typically runs just before mid-night on a given system, and since
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+the first record from
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+.B sadc
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+can also be written to the previous day's data file
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+(thereby moving its modification time up a bit), the
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+.B sa2
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+script will leave
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+30 files untouched. So for a setting of 28, and counting the data file of
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+the current day, there will always be 31 files (or 30 files, depending on the
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+number of days in a month) in the @SA_DIR@ directory during the majority
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+of a given day. E.g.:
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+
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+April 30th: 31 files (Apr 30th-1st, Mar 31th)
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+.br
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+May 1st: 30 files (May 1st, Apr 30th-2nd)
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+
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+Yet we can note the following exceptions (as inspected at Noon of the given
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+day):
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+
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+February 28th: 31 files (Feb 28th-1st, Jan 31st, 30th & 29th)
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+.br
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+March 1st: 30 files (Mar 1st, Feb 28th-2nd, Jan 31st & 30th)
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+.br
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+March 2nd: 29 files (Mar 1st & 2nd, Feb 28th-3rd, Jan. 31st)
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+.br
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+March 3rd: 28 files (Mar 1st-3rd, Feb 28th-4th)
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+.br
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+March 4th - March 28th: 28 files
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+.br
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+March 29th: 29 files
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+.br
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+March 30th: 30 files
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+.br
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+March 31st: 31 files
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+
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+(Determining the number of files in March on a leap year is left as an
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+exercise for the reader).
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.TP
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.B SADC_OPTIONS
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6b782c |
@@ -34,6 +116,10 @@
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These options are used only when a new data file is created. They will be
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ignored with an already existing one.
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+.TP
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+.B ZIP
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+Program used to compress data and report files.
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+
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.SH FILES
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.IR @SYSCONFIG_DIR@/sysstat
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