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Symbian3/PDK/Source/GUID-3D8B134E-3C2F-5BAF-82AB-0AB786A5D22D.dita
changeset 1 25a17d01db0c
child 3 46218c8b8afa 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-3D8B134E-3C2F-5BAF-82AB-0AB786A5D22D.dita	Fri Jan 22 18:26:19 2010 +0000
@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE task
+  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">
+<task id="GUID-3D8B134E-3C2F-5BAF-82AB-0AB786A5D22D" xml:lang="en"><title> Directory
+Cache Tutorial</title><shortdesc>Describes how to configure the directory cache in a FAT file system
+enabled drive. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>
+<prereq id="GUID-E3BEB74D-79C7-59A9-9366-CCD8B52DB7F8-GENID-1-7-1-14-1-1-9-1-7-1-7-1-3-1"><p>Before you start,
+you must: </p> <ul>
+<li id="GUID-41E9D4BC-974F-5046-8FC1-E3C67298C5AA"><p>have the knowledge of
+the <xref href="GUID-AFFC4002-3A06-5458-A4D9-1E0AEDB8C534.dita">FAT file system</xref>  </p> </li>
+<li id="GUID-2F012BA2-6AF2-56D6-852E-6042618ECD8F"><p>have the knowledge of
+the <xref href="GUID-AFFC4002-3A06-5458-A4D9-1E0AEDB8C534.dita#GUID-AFFC4002-3A06-5458-A4D9-1E0AEDB8C534/GUID-86BEEEF5-F4F0-50AD-AF29-0A0277455BDB">directory
+cache</xref>  </p> </li>
+<li id="GUID-88E374C2-B670-53DE-8677-7712ECE3EB8F"><p>have the knowledge of
+the <xref href="GUID-AFFC4002-3A06-5458-A4D9-1E0AEDB8C534.dita#GUID-AFFC4002-3A06-5458-A4D9-1E0AEDB8C534/GUID-7675348A-9D74-54DB-A09A-0537AD4D6CA5">global
+cache manager</xref>. </p> </li>
+</ul> </prereq>
+<context id="GUID-6799E3F3-353E-5C00-A38C-D32F888392AA-GENID-1-7-1-14-1-1-9-1-7-1-7-1-3-2"><p>The developers
+can configure the directory cache memory with a dynamic range. The memory
+allocation for directory cache on a drive depends on the available global
+cache memory. The global cache manager allocates memory to various cache memory
+on different drives. The directory cache for a drive can be configured with
+a dynamic range in the <filepath>estart.txt</filepath> file. The dynamic range
+configuration consists of two values : </p> <ol id="GUID-166C832A-5B33-5271-AABD-A56EC49A61A3">
+<li id="GUID-4191D5E1-0A2E-5C0D-B1C6-FE49F5C24CE4"><p> <codeph>FAT_DirCacheSizeMin</codeph> specifies
+the minimum size of global cache to be allocated to the directory cache on
+a drive. </p> </li>
+<li id="GUID-E6941E15-9549-56B8-8F62-7BAAAD7DD90D"><p> <codeph>FAT_DirCacheSizeMax</codeph> specifies
+the maximum size of the global cache to be allocated to the directory cache
+of a drive. </p> </li>
+</ol> <p>The minimum size of the directory cache is permanently reserved during
+the file server startup time. The maximum memory allocation depends on the
+available system memory and hence not guaranteed under low memory conditions. </p> <p>The
+size of the cache memory is specified in Kilobytes. The default value for
+both the parameters is 128 Kilobytes. </p> </context>
+<steps id="GUID-67EA65BE-4457-57F5-B4F1-6A7A2F41354D">
+<step id="GUID-EBD3AEBE-54CB-53AA-9014-E2378A857221"><cmd>Open the estart.txt
+file </cmd>
+<info><p>to configure the directory cache.</p> </info>
+</step>
+<step id="GUID-B24F2606-491F-5888-A025-3B5F0F3D4D9B"><cmd/>
+<info>Create a new entry for a drive, say for example drive D: </info>
+</step>
+<step id="GUID-015BE3C2-6891-5BFC-979B-EBC7CF7E4590"><cmd/>
+<info>Enter the minimum size of the directory cache to be allocated to the
+parameter <codeph>FAT_DirCacheSizeMin</codeph>  </info>
+<info>The value is specified in Kilobytes </info>
+</step>
+<step id="GUID-D6EF2F51-44D6-57EF-9614-6B7AB8D43848"><cmd/>
+<info>Enter the maximum size of the directory cache that can be allocated
+when available to the parameter <codeph>FAT_DirCacheSizeMax</codeph>  </info>
+<info>The value is specified in Kilobytes. </info>
+</step>
+<step id="GUID-6EE5BE56-FD6E-523D-947D-2DCA5D4C0191"><cmd/>
+<info>Repeat steps 2-4 for other drives. </info>
+</step>
+<step id="GUID-A98147EC-F076-5A27-B7D4-AAA0A87E70FC"><cmd/>
+<info>Save and close the estart.txt file </info>
+</step>
+<step id="GUID-9D9F272C-F1F1-58F4-AB8B-672AD09ECA16"><cmd/>
+<info>Build the ROM with the modified estart.txt file </info>
+</step>
+</steps>
+<example><p> The sample entry for drive D is shown below: </p><codeblock xml:space="preserve">[DriveD]
+FAT_DirCacheSizeMin  128
+FAT_DirCacheSizeMax  256</codeblock></example>
+</taskbody><related-links>
+<link href="GUID-DC0BF2A3-613B-595C-BF47-07F29E2A7893.dita"><linktext>Leaf Directory
+Cache Configuration                 Tutorial</linktext></link>
+</related-links></task>
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FCL/sftools/depl/docscontent