<font><font face="tahoma,sans-serif">I have noticed that the average time interval between two I/O requests is too small. The first column means the I/O arrive time (ms), you issued 33 I/Os in 8.8ms. The average time interval between two I/O requests is only 0.27ms. However, the disk I/O access time (access time = data transfer time + rotation time + seek time) is far larger than 0.27ms. There are too many pending I/O requests in the waiting queue and so the average response time is </font></font>Incredibly large.<br>
<br><div class="gmail_quote">2012/8/14 leon hsu <span dir="ltr"><<a href="mailto:liangxiongxu@gmail.com" target="_blank">liangxiongxu@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi yueyinliang,<br>Hopefully, the name is same with your mail: ) Thanks for you reply.<br><br>The attaching file is the hard disk configuration. I only have one hard disk. <br><br>Could you take a look and check the configuration for me? Thank you so much.<br>
<br>The ascii trace looks like this:<br><br>0 0 0 24 0<br>0 0 0 24 1<br>1 0 24 16 0<br>1.5 0 40 16 0<br>2 0 56 16 0<br>2.2 0 72 16 0<br>2.4 0 88 16 0<br>
2.6 0 104 16 0<br>2.8 0 120 16 0<br>3 0 136 8 0<br>3.125 0 144 8 0<br>3.25 0 152 8 0<br>3.375 0 160 8 0<br>3.5 0 168 8 0<br>3.625 0 176 8 0<br>
3.75 0 184 8 0<br>3.875 0 192 8 0<br>4 0 200 8 0<br>4.333333 0 208 8 0<br>4.666667 0 216 8 0<br>5 0 224 8 0<br>5.333333 0 232 8 0<br>5.666667 0 240 8 0<br>
6 0 248 8 0<br>6.333333 0 256 8 0<br>6.666667 0 264 8 0<br>7 0 272 16 0<br>7.5 0 288 16 0<br>8 0 304 16 0<br>8.2 0 320 16 0<br>8.4 0 336 16 0<br>
8.6 0 352 16 0<br>8.8 0 368 16 0<br><br><br><br>Leon<div class="HOEnZb"><div class="h5"><br><br><br><div class="gmail_quote">On Sun, Aug 12, 2012 at 11:24 PM, Yinliang Yue <span dir="ltr"><<a href="mailto:yueyinliang@gmail.com" target="_blank">yueyinliang@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font><font face="tahoma,sans-serif">There are so many I/O requests waiting in the queue. I do not know the details of your storage systems, such as how many disks, how these disks are organized. I suggest you check your storage configuration.<br>
</font></font><br><div class="gmail_quote">2012/8/13 leon hsu <span dir="ltr"><<a href="mailto:liangxiongxu@gmail.com" target="_blank">liangxiongxu@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div>
<br clear="all">Hi, everybody,<br><br>I need you help:-)<br><font size="3"><font face="Calibri"><br>When I set the "I/O Trace Time Scale" in disksim_iosim to 1, the simulator shows a saturation error before.<br>
But when I change "I/O Trace Time Scale" in disksim_iosim to 10, the error disappeared.<br>
<br>I think that is because the "request arrival time" of the trace file is too small, which results that the number of the arriving requests in one second is more than ones that the simulator could deal with in one second. So I change the "I/O Trace Time Scale" in disksim_iosim to 10.<br>
<br>Next, I run it again, but the weired result made me crazy. When I ran disksim using my ascii trace file, the overall response time, almost 20000, is too big to believable.<br><br>Do anybody could tell me the reason and how to solve this problem. Thank you so much. I am so appreciated.<br>
<br><br>I set the "request arrival time" like the following style.<br><br>0.5 <br>0.75<br>1<br>1.2000<br>1.4000<br>1.5000<br>1.7000<br>2.0<br>.....<br><br><br>Hopefully, it could give some hints to find out my problem. Thanks.<span><font color="#888888"><br>
<br><br>Leon<br><br><br><br><br><br></font></span></font></font><br>
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