RRDFIRST(1) rrdtool RRDFIRST(1)NAME
rrdfirst - Return the date of the first data sample in an RRA within an RRD
SYNOPSIS
rrdtool first filename [--rraindex number]
DESCRIPTION
The first function returns the UNIX timestamp of the first data sample entered into the specified RRA of the RRD file.
filename
The name of the RRD that contains the data.
--rraindex number
The index number of the RRA that is to be examined. If not specified, the index defaults to zero. RRA index numbers can be
determined through rrdtool info.
AUTHOR
Burton Strauss <Burton@ntopSupport.com>
1.4.7 2008-03-15 RRDFIRST(1)
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RRDINFO(1) rrdtool RRDINFO(1)NAME
rrdinfo - extract header information from an RRD
SYNOPSIS
rrdtool info filename [--daemon address]
DESCRIPTION
The info function prints the header information from an RRD in a parsing friendly format.
Check rrdcreate if you are uncertain about the meaning of the individual keys.
filename
The name of the RRD you want to examine.
--daemon address
Address of the rrdcached daemon. If specified, a "flush" command is sent to the server before reading the RRD files. This allows
rrdtool to return fresh data even if the daemon is configured to cache values for a long time. For a list of accepted formats, see
the -l option in the rrdcached manual.
rrdtool info --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd
EXAMPLE
This is the output generated by running info on a simple RRD which contains two data sources and one RRA. Note that the number after the
last_update keyword is in seconds since 1970. The string NaN stands for *UNKNOWN* data. In the example it means that this RRD has neither
minimum nor maximum values defined for either of its data sources.
filename = "random.rrd"
rrd_version = "0001"
step = 300
last_update = 955892996
header_size = 2872
ds[a].type = "GAUGE"
ds[a].minimal_heartbeat = 600
ds[a].min = NaN
ds[a].max = NaN
ds[a].last_ds = "UNKN"
ds[a].value = 2.1824421548e+04
ds[a].unknown_sec = 0
ds[b].type = "GAUGE"
ds[b].minimal_heartbeat = 600
ds[b].min = NaN
ds[b].max = NaN
ds[b].last_ds = "UNKN"
ds[b].value = 3.9620838224e+03
ds[b].unknown_sec = 0
rra[0].cf = "AVERAGE"
rra[0].pdp_per_row = 1
rra[0].cdp_prep[0].value = nan
rra[0].cdp_prep[0].unknown_datapoints = 0
rra[0].cdp_prep[1].value = nan
rra[0].cdp_prep[1].unknown_datapoints = 0
ENVIRONMENT VARIABLES
The following environment variables may be used to change the behavior of "rrdtool info":
RRDCACHED_ADDRESS
If this environment variable is set it will have the same effect as specifying the "--daemon" option on the command line. If both are
present, the command line argument takes precedence.
AUTHOR
Tobias Oetiker <tobi@oetiker.ch>
1.4.7 2009-04-20 RRDINFO(1)
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