Windows: Direct IO Support for Service

[openafs.git] / doc / xml / ReleaseNotesWindows / relnotes.xml

diff --git a/doc/xml/ReleaseNotesWindows/relnotes.xml b/doc/xml/ReleaseNotesWindows/relnotes.xml
index 1f8f378..d3cce35 100644 (file)
--- a/doc/xml/ReleaseNotesWindows/relnotes.xml
+++ b/doc/xml/ReleaseNotesWindows/relnotes.xml
@@ -4303,6 +4303,25 @@ Default: 0</para>
           <para>0: do not generate 8.3 compatible short names.</para>
           <para>1: generate 8.3 compatible short names.</para>
         </section>
+        <section>
+          <title id="Regkey_TransarcAFSDaemon_Parameters_DirectIO">Value: DirectIO</title>
+          <indexterm significance="normal">
+            <primary>DirectIO</primary>
+          </indexterm>
+          <para>Regkey: [HKLM\SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters]</para>
+          <para>Type: DWORD {0, 1}
+          </para>
+          <para>
+            Default: 1</para>
+          <para>The AFS redirector as of 1.7.22 supports two I/O processing mechanisms. The new
+            implementation is referred to as Direct I/O.  Direct I/O provides two benefits over the
+            prior implementation.  First, it is faster.  Second, it provides support for
+            CreateFile(FILE_FLAG_NO_BUFFERING).  When a file is opened with the
+            FILE_FLAG_NO_BUFFERING flag set, the AFSCache is bypassed and all I/O operations on the
+            file are performed directly to and from the file server.</para>
+          <para>0: use the older I/O processing mechanism.</para>
+          <para>1: use the new Direct I/O processing mechanism.</para>
+        </section>
       </section>
       <section>
         <title id="Regkey_TransarcAFSDaemon_Parameters_GlobalAutoMapper">Regkey: