Official document link: http://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html
Summary
rrdtool create filename [--start |-b start time ] [--step |-s step ] [--no-overwrite ] [DS: ds-name : DST : dst arguments ] [RRA: CF : cf arguments ]
Italic is the value that needs to be modified
description
The create function of RRDtool lets you set up new Round Robin Database (RRD ) files. The file is created at its final, full size and filled with *UNKNOWN* data.
The creation function of RRDtool enables you to set up a new Round Robin Database ( RRD ) file. This file is filled with *UNKNOWN* data when it is created , the structure is unchangeable, and it has a complete list of records.
Parameter description (partial)
DS: ds-name : DST : dst arguments
An RRD database can accept one or more data sources (DS). If you think of RRD as a table in a relational database, then DS is equivalent to a field. If this RRD database has multiple DSs, then multiple DSs are required when creating RRD: ds-name: DST: dst arguments
ds-name: the name of the DS, equivalent to the field name of a table
DST: Data Source Type, DS type, there are five types of GAUGE, COUNTER, DERIVE, ABSOLUTE and COMPUTE
When DST is GAUGE, COUNTER, DERIVE, ABSOLUTE, the creation format of DS is
DS: ds-name : GAUGE | COUNTER | DERIVE | ABSOLUTE : heartbeat : min : max
Heartbeat is the maximum time between two updates (unit: seconds). After the last record is updated, if there is no new data after this time, the value of this field of the current record is set to UNKNOWN.
min and max are the minimum and maximum values of this field. If the actual value exceeds this range, its value in the RRD database will be set to UNKNOWN. If you know and don't care about the min or max value, you can set it to U.
When DST is COMPUTE, the creation format of DS is
DS: ds-name : COMPUTE : rpn-expression
For a detailed description of these five DSTs, please refer to http://www.360doc.com/content/07/0302/20/15540_382048.shtml