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<H1>Disk Activity</H1>

<H2>Description</H2>

The Disk Activity metric monitors the hard disk activity on the target being monitored. For each device on the system, this metric provides information about access to the device. This information includes: device name, disk utilization, write statistics, and read statistics for the device.

The data sources for this metric category include the following:
 
<TABLE WIDTH="100%" CELLPADDING="2" CELLSPACING="2" BORDER="1" SUMMARY="This table lists the metric's data sources for each host.">
<TR>
<TD WIDTH="24%" SCOPE="col">

Host</TD>
<TD WIDTH="76%" SCOPE="col">

Data Source</TD>
</TR>
<TR>
<TD WIDTH="24%" SCOPE="row">

Solaris</TD>
<TD WIDTH="76%" >

kernel statistics (class kstat_io)</TD>
</TR>
<TR>
<TD WIDTH="24%" SCOPE="row">

HP</TD>
<TD WIDTH="76%" >

pstat_getdisk system call</TD>
</TR>
<TR>
<TD WIDTH="24%" SCOPE="row">

Linux</TD>
<TD WIDTH="76%" >

iostat command</TD>
</TR>
<TR>
<TD WIDTH="24%" SCOPE="row">

HP Tru64</TD>
<TD WIDTH="76%" >

table() system call</TD>
</TR>
<TR>
<TD WIDTH="24%" SCOPE="row">

IBM AIX</TD>
<TD WIDTH="76%" >

oracle_kstat() system call</TD>
</TR>
<TR>
<TD WIDTH="24%" SCOPE="row">

Windows</TD>
<TD WIDTH="76%" >

performance data counters</TD>
</TR>
</TABLE>

Ms-Dos/Windows Unix Write backup

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