2009-02-14 00:42:34 +00:00
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<html xmlns:n="http://nevow.com/ns/nevow/0.1">
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<head>
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2009-02-26 04:09:04 +00:00
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<title>AllMyData - Tahoe - Reliability Tool</title>
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2009-05-03 20:25:33 +00:00
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<link href="/tahoe_css" rel="stylesheet" type="text/css"/>
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2009-02-14 00:42:34 +00:00
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<link href="/webform_css" rel="stylesheet" type="text/css"/>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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</head>
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<body>
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<h1>Tahoe Reliability Tool</h1>
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<p>Given certain assumptions, this page calculates probability of share loss
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over time, to help make informed decisions about how much redundancy and
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repair bandwidth to configure on a Tahoe grid.</p>
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<div n:render="forms" />
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<h2>Simulation Results</h2>
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<p>At the end of the report span (elapsed time <span n:render="report_span"
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/>), the simulated file had the following properties:</p>
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<ul>
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<li>Probability of loss (no maintenance):
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<span n:render="P_loss_unmaintained"/></li>
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<li>Probability of loss (with maintenance):
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<span n:render="P_loss_maintained"/></li>
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<li>Average repair frequency:
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once every <span n:render="P_repair_rate"/> secs</li>
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<li>Average shares generated per repair:
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<span n:render="P_repair_shares"/></li>
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</ul>
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<p>This table shows how the following properties change over time:</p>
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<ul>
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<li>P_repair: the chance that a repair was performed in the most recent
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check period.</li>
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<li>P_dead (unmaintained): the chance that the file will be unrecoverable
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without periodic check+repair</li>
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2009-02-19 20:55:15 +00:00
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<li>P_dead (maintained): the chance that the file will be unrecoverable even
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2009-02-14 00:42:34 +00:00
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with periodic check+repair</li>
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</ul>
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<div>
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<table n:render="sequence" n:data="simulation_table" border="1">
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<tr n:pattern="header">
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<td>t</td>
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<td>P_repair</td>
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<td>P_dead (unmaintained)</td>
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<td>P_dead (maintained)</td>
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</tr>
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<tr n:pattern="item" n:render="simulation_row">
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<td><n:slot name="t"/></td>
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<td><n:slot name="P_repair"/></td>
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<td><n:slot name="P_dead_unmaintained"/></td>
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<td><n:slot name="P_dead_maintained"/></td>
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</tr>
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<tr n:pattern="empty"><td>no simulation data!</td></tr>
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</table>
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</div>
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</body>
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</html>
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