<br><br><div class="gmail_quote">On Tue, Jul 13, 2010 at 5:19 PM, Mike Miller <span dir="ltr"><<a href="mailto:mbmiller%2Bl@gmail.com">mbmiller+l@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
<br>
Thus, this...<br>
<br>
External HDD #1 --> remote machine --> External HDD #2<br>
<br>
...was about twice as fast as this...<br>
<br>
External HDD #1 --> External HDD #2<br>
<br>
There's something very wrong with a system that works that way. If I had<br>
enough space on my internal HDD, I'd do this and probably get even better<br>
results:<br>
<br>
External HDD #1 --> Internal HDD --> External HDD #2<br>
<br>
<br>
Another crazy thing is that it must have been really killing my CPU<br>
because I could hardly do anything else while the drive-to-drive USB<br>
transfer was active, but programs like "ps aux" and "top" (both of which<br>
literally took minutes to launch) seemed to show that almost nothing was<br>
happening. Why is that?<br></blockquote><div><br>I think this is likely a case of bus-contention. Especially if the reads<br>and writes were being sent through the same bus/controller. I've<br>had similar issues when doing things with USB devices. <br>
<br>Also were you doing your copies at the file system level <br>(cp or drag-and-drop) or at the block/device (dd) level? <br>If at the file system you're incurring overhead in allocating <br>space within the file system and updating the filesystem <br>
structures. Depending on how many files you have - that <br>can add up to a significant amount of overhead.<br><br>-Rob<br><br> <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
Mike<br>
<br>
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</blockquote></div><br>