<div><span class="gmail_quote">On 9/20/05, <b class="gmail_sendername">Mercury Morris</b> <<a href="mailto:mercury.morris@gmail.com">mercury.morris@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><span class="q"><span class="gmail_quote">On 9/20/05, <b class="gmail_sendername">Mark Knecht</b> <<a href="mailto:markknecht@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">markknecht@gmail.com
</a>> wrote:</span></span><span class="q"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>> One more observation, about a specific time: Last night's out-of-sync
<br>> break occurred at 36:19 into the Charlie Rose show. That's within the<br>> first two minutes of Letterman. Maybe there is extra overhead at the start<br>> of a recording?<br><br>Possibly.</blockquote>
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Extra overhead..., Hmmm.<br>
<br>
Going back over the logs one more time, I found an event that<br>
occurred three seconds before the out-of-sync discontinuity in<br>
the Charlie Rose program. That event is the AutoExpire of the<br>
oldest Letterman show. The size? Sixteen gigabytes - 16GB !<br>
<br>
That's because I have the recording set for not just one hour, but<br>
over two hours to also record Craig Ferguson. (CBS doesn't start<br>
their programs on the zero-zero mark in a minute, so I gang the<br>
two shows together for ease-of-viewing).<br>
<br>
Is seems quite likely to me that the EXT3 filesystem cannot delete<br>
the 16GB file fast enough, thus causing the IOBOUND condition.<br>
<br>
A few months ago, I observed the EXT3 filesystem's long delays<br>
in deleting old recorded programs during the preparation for adding<br>
a new physical volume to the logical volume that makes up the file<br>
storage for recorded programs. I could enter all the "rm" commands<br>
as fast as I wanted, but the system took betwen one and two minutes<br>
to complete all the requests.<br>
<br>
It will be easy to "Pre-Expire" a couple of old Letterman shows, manually,<br>
and then see if Charlie Rose is recorded without any discontinuity.<br>
<br>
-- <br>
MM<br>
<br>