<html dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style>
<!--
@font-face
{font-family:Calibri}
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif"}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline}
span.EmailStyle17
{font-family:"Calibri","sans-serif";
color:windowtext}
.MsoChpDefault
{font-family:"Calibri","sans-serif"}
@page WordSection1
{margin:1.0in 1.0in 1.0in 1.0in}
-->
</style><style id="owaParaStyle" type="text/css">P {margin-top:0;margin-bottom:0;}</style>
</head>
<body ocsi="0" fpstyle="1" lang="EN-US" link="blue" vlink="purple">
<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">>How can I fetch the finest resolution while specifying e-2days for the start time?<br>
<br>
If you request a given resolution then RRDtool will return it -- PROVIDED the RRD file actually has it available for ALL the requested time window.<br>
<br>
<p class="MsoNormal">>step = 15</p>
<p class="MsoNormal">>rra[0].cf = "AVERAGE"</p>
<p class="MsoNormal">>rra[0].rows = 244</p>
<p class="MsoNormal">>rra[0].pdp_per_row = 1</p>
<br>
What this shows is that your RRD file has a 1cdp=1pdp AVG RRA (good). HOWEVER, you only have 244 rows in this RRA, and your step is 15 seconds. So, 244x1x15=3660seconds=61minutes, the length of your RRA. This means you can get this resolution going back in
time 61 minutes, but no longer (as the data has been discarded).<br>
<br>
If you want to get the 15s resolution back for 2 days, then you need 2x24x60x60/15=11520 rows. In fact, safest to add several more to avoid fencepost problems.<br>
<br>
So, extend your RRA number 0 by 11520 rows and you should be able to achieve what you want.<br>
<br>
Steve<br>
<div><br>
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px"><strong>Steve Shipway</strong></div>
<div style="font-family:Tahoma; font-size:13px">University of Auckland ITS</div>
<div style="font-family:Tahoma; font-size:13px"><em>UNIX Systems Design Lead</em></div>
<div style="font-family:Tahoma; font-size:13px"><a href="mailto:s.shipway@auckland.ac.nz">s.shipway@auckland.ac.nz</a></div>
<div style="font-family:Tahoma; font-size:13px">Ph: +64 9 373 7599 ext 86487</div>
<div style="font-family:Tahoma; font-size:13px"><em></em> </div>
</div>
</div>
<div style="font-family: Times New Roman; color: #000000; font-size: 16px">
<hr tabindex="-1">
<br>
<div>
<div class="WordSection1"></div>
</div>
</div>
</div>
</body>
</html>