/usr/share/pyshared/allmydata/web/reliability.xhtml is in tahoe-lafs 1.9.2-1.
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<head>
<title>Tahoe-LAFS - Reliability Tool</title>
<link href="/tahoe.css" rel="stylesheet" type="text/css"/>
<link href="/icon.png" rel="shortcut icon" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<body>
<h1>Tahoe-LAFS Reliability Tool</h1>
<p>Given certain assumptions, this page calculates probability of share loss
over time, to help make informed decisions about how much redundancy and
repair bandwidth to configure on a Tahoe-LAFS grid.</p>
<div n:render="forms" />
<h2>Simulation Results</h2>
<p>At the end of the report span (elapsed time <span n:render="report_span"
/>), the simulated file had the following properties:</p>
<ul>
<li>Probability of loss (no maintenance):
<span n:render="P_loss_unmaintained"/></li>
<li>Probability of loss (with maintenance):
<span n:render="P_loss_maintained"/></li>
<li>Average repair frequency:
once every <span n:render="P_repair_rate"/> secs</li>
<li>Average shares generated per repair:
<span n:render="P_repair_shares"/></li>
</ul>
<p>This table shows how the following properties change over time:</p>
<ul>
<li>P_repair: the chance that a repair was performed in the most recent
check period.</li>
<li>P_dead (unmaintained): the chance that the file will be unrecoverable
without periodic check+repair</li>
<li>P_dead (maintained): the chance that the file will be unrecoverable even
with periodic check+repair</li>
</ul>
<div>
<table n:render="sequence" n:data="simulation_table">
<tr n:pattern="header">
<td>t</td>
<td>P_repair</td>
<td>P_dead (unmaintained)</td>
<td>P_dead (maintained)</td>
</tr>
<tr n:pattern="item" n:render="simulation_row">
<td><n:slot name="t"/></td>
<td><n:slot name="P_repair"/></td>
<td><n:slot name="P_dead_unmaintained"/></td>
<td><n:slot name="P_dead_maintained"/></td>
</tr>
<tr n:pattern="empty"><td>no simulation data!</td></tr>
</table>
</div>
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