Source code of Windows XP (NT5)
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<FONT FACE="Verdana" SIZE=5><H2>FPFilter</H2></FONT><FONT FACE="Verdana" SIZE=2><P><span style="color:#FF0000;font-size:10pt;font-family:Arial">[This is preliminary documentation and subject to change.]</span></P>
<H3>SUMMARY</H3></FONT><FONT FACE="Verdana" SIZE=2><P>FPFilter is a sample disk filter driver that demonstrates how a diskfailure prediction filter driver could be implemented. A failure predictionfilter driver can predict when a disk may fail and notify the disk driver stackof this condition. The disk driver stack will then alert the operating system to thecondition. A failure prediction filter driver can use proprietary hardware requestsand/or software algorithms to predict disk failure.<p><H3>BUILDING THE SAMPLE</H3></FONT><FONT FACE="Verdana" SIZE=2><P>
Follow these steps to WMI-enable a driver with the sample code:<p>1.Determine the algorithm to use to predict disk failure.Add code for this in the <b>FpFilterDeviceControl</b> routine where it handles theIOCTL_STORAGE_FAILURE_PREDICTION I/O control (IOCTL). <o:p></o:p></span></p>2.
Disk drives that are implemented to the ATAPI SMART specification or theSCSI Informational Exceptions specification already have failure prediction supportbuilt into the disk driver stack. The filter driver can forward the IOCTL tothe next device on its stack and examine the returned information to determineif the disk driver stack is reporting failure.<o:p></o:p></span></p>3.
Enterthe checked or free build environment. Then, while in the Fpfilter sampledirectory, type <b>build</b>. A successful build produces the binary Fpfilter.sys.<o:p></o:p></span></p>4.
To install the failureprediction filter driver for a specific disk, first install the filter driver using the Add Hardware Wizard. This will install Fpfilter.inf.Then use the AddFilter tool to include the failure prediction filter driver as anupper filter on a specific physical disk.
<H3>RESOURCES</H3></FONT><FONT FACE="Verdana" SIZE=2><P>Please see the <i>Kernel-Mode Drivers</i> section of Microsoft® Windows® 2000 DDK documentation for more information.<H3>CODE TOUR</H3><H4>File Manifest</H4></FONT><U><PRE>File		Description</U>Fpfilter.c	Failure prediction filter driver code.Fpfilter.rc	Resource file containing version information.Fpfilter.inf	INF file used to install the filter driver service.Makefile	Standard Microsoft® Windows NT®/Windows® 2000 makefile.Sources	 Sources for build.
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