<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/ac97edb9-ae8a-451e-882f-c0c878ba06b4/17A6BD37-3D59-41A3-A550-CF1E5293557E/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.oreillynet.com/pub/a/network/2002/01/18/diskperf.html" href="http://www.oreillynet.com/pub/a/network/2002/01/18/diskperf.html" style="font-size: 11px;">www.oreillynet.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.oreillynet.com/pub/a/network/2002/01/18/diskperf.html">Suppose, for example, the <CODE>Avg. Disk Queue Length</CODE> counter reads 10.3, and the <CODE>Current Disk Queue Length</CODE> counter shows four requests in the disk queue at the end of the measurement interval. If the previous value of <CODE>Current Disk Queue Length</CODE> was 0, the equilibrium assumption necessary for Little's Law does not hold. Since the number of arrivals is evidently greater than the number of completions during the interval, there is no valid interpretation for the value in the <CODE>Avg. Disk Queue Length</CODE> counter, and you should ignore the counter value. However, if both the present measurement of the <CODE>Current Disk Queue Length</CODE> counter and the previous value are equal, then it is safe to interpret the <CODE>Avg. Disk Queue Length</CODE> counter as the average number of outstanding I/O requests to the disk over the interval, including both requests currently in service and requests queued for service</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/17A6BD37-3D59-41A3-A550-CF1E5293557E/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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