формат архива показателей производительности (performance metrics archive format)
Описание (Description)
Performance Co-Pilot (PCP) archives store historical values about
arbitrary metrics recorded from a single host. Archives are
machine independent and self-contained - all metadata required
for off-line or off-site analysis is stored.
The format is stable in order to allow long-term historical
storage and processing by PMAPI client tools.
Archives may be read by most PCP client tools, using the
-a/--archive NAME option, or dumped raw by pmdumplog(1).
Archives are created primarily by pmlogger(1), however they can
also be created using the LOGIMPORT(3) programming interface.
Archives may be merged, analyzed, modified and subsampled using
pmlogreduce(1), pmlogsummary(1), pmlogrewrite(1) and
pmlogextract(1). In addition, PCP archives may be examined in
sets or grouped together into "archive folios", which are created
and managed by the mkaf(1) and pmafm(1) tools.
Archives consist of several physical files that share a common
arbitrary prefix, e.g. myarchive.
myarchive.0, myarchive.1, ...
One or more data volumes containing the metric values and
any error codes encountered during metric sampling.
Typically the largest of the files and may grow very
rapidly, depending on the pmlogger sampling interval(s)
being used.
myarchive.meta
Information for PMAPI functions such as pmLookupDesc(3),
pmLookupLabels(3) and pmLookupInDom(3). The metadata file
may grow sporadically as logged metrics, instance domains
and labels vary over time.
myarchive.index
A temporal index, mapping timestamps to offsets in the
other files.
