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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Creating logical devices > advanced settings</title>
<base target="_top">
<link rel="stylesheet" href="basicpg.css">
</head>
<body text="#000000" bgcolor="#FFFFFF" link="#0000FF" vlink="#333399" alink="#0000FF">
<h1>Creating logical devices > advanced settings</h1>
<p><b><img src="images/note.gif" width="15" height="17"> Note:</b> Not all options
are available for all RAID levels.</p>
<p>Use the <strong>Advanced settings</strong> in the Configuration wizard to tune
your logical device configuration for optimal performance. You can set the following
options:
<ul>
<li><strong>Write cache</strong> - Determines how data is stored in the controller's
cache memory. You can choose from two available settings: <a href="cwrcache.htm">write-through</a>
and <a href="cwrcache.htm">write-back</a>.<br>
<br>
</li>
<li><strong>stripe size</strong> - Determines the amount of data, in kilobytes
(KB), written on one <a href="gsegment.htm">segment</a> of a logical device
before subsequent data is stored on the next segment.<br>
<br>
<b><img src="images/note.gif" width="15" height="17"> Note:</b> The default
stripe size usually provides the best performance for typical applications.
<br>
<br>
</li>
<li><strong>Read cache</strong> - Enables and disables read caching. When read-caching
is enabled, the controller monitors read access to the logical device. If it
detects a pattern, it pre-loads the cache with the data that seems most likely
to be read next. The default is Enabled. <br>
<br>
</li>
<li><strong>Initialize method</strong> - Determines the method used to initialize
the logical device. You can choose from three available settings:<br>
<br>
<ul>
<li><strong>Build</strong> - For RAID Level-1 logical devices,
copies the data from the primary drive to the mirror drive. For RAID Level-5
logical devices, computes and writes the correct parity for the entire
logical device. <br>
<br>
<br>
<b><img src="images/note.gif" width="15" height="17"> Note:</b> Build
can be a lengthy operation. The Adaptec Storage Manager performs this task in
the background. However, you cannot use the logical device until the task
is complete. <br>
<br>
</li>
<li><strong>Clear</strong> - removes pre-existing data by overwriting every
block in the logical device. This method is faster than build
but the logical device is not available immediately. <br>
<br>
<img src="images/hstraid1.gif" width="37" height="32"> For HostRAID
controllers, the Adaptec Storage Manager supports the Clear initialization method
only. <br>
</li>
<li><strong>Quick</strong> - makes the logical device available immediately.
It is the fastest method but should be used only for <em>new</em> physical
disks.<br>
<br>
</li>
</ul>
</li>
<li><strong>Initialize priority</strong> - Adjusts the priority of the initialization
task. The default is High: initialize the logical device as fast as possible.<br>
</li>
</ul>
<p>When you are ready to continue, click <strong>Next</strong>. The "<a href="wsummcc.htm">Configuration
summary</a>" window opens.<br>
</p>
<h2>More information</h2>
<ul>
<li><a href="cstripe.htm">Understanding stripe size</a></li>
<li><a href="cwrcache.htm">Understanding write-cache mode for logical devices</a></li>
<li><a href="csynchld.htm">Understanding logical-drive verification</a></li>
</ul>
<div align="center">
<hr>
<a href="gportal.htm">Glossary</a> | <a href="menutoc.htm">Contents</a></div>
<p> </p>
<p align="right">x-0754-ASM-00-08-EN </p>
</body>
</html>