Sophie

Sophie

distrib > Fedora > 14 > x86_64 > by-pkgid > 232b219594982dda0048c687d06abe57 > files > 390

cacti-0.8.7h-1.fc14.noarch.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Data Storage</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REL="HOME"
TITLE="The Cacti Manual"
HREF="index.html"><LINK
REL="UP"
TITLE="Principles of Operation"
HREF="operating_principles.html"><LINK
REL="PREVIOUS"
TITLE="Principles of Operation"
HREF="operating_principles.html"><LINK
REL="NEXT"
TITLE="Data Presentation"
HREF="data_presentation.html"><LINK
REL="STYLESHEET"
TYPE="text/css"
HREF="manual.css"></HEAD
><BODY
CLASS="SECT1"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>The Cacti Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="operating_principles.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Chapter 5. Principles of Operation</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="data_presentation.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="DATA_STORAGE"
>Data Storage</A
></H1
><P
>				There are lots of different approaches for this task. Some may
				use an (SQL) database, others flat files. Cacti uses <A
HREF="http://www.rrdtool.org/"
TARGET="_top"
><SPAN
CLASS="APPLICATION"
>RRDTool</SPAN
>
				</A
> to store data.
			</P
><P
>				RRD is the acronym for Round Robin Database.
				RRD is a system to store and display time-series data
				(i.e. network bandwidth, machine-room temperature, server load average).
				It stores the data in a very compact way that will not expand
				over time, and it can create beautiful graphs.
				This keeps storage requirements at bay.
			</P
><P
>				Likewise, rrdtool will perform some specific tasks.
				It performs consolidation to combine raw data (a primary data point in rrdtool lingo)
				to consolidated data (a consolidated data point). This way, historical data
				is compressed to save space. rrdtool knows different consolidation functions:
				AVERAGE, MAXIMUM, MINIMUM and LAST.
			</P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="operating_principles.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="data_presentation.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Principles of Operation</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="operating_principles.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Data Presentation</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>