<div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">No, remember that was loaded up with 1 tuner recording and one being<br>viewed to simulate what would be left for the other tuner if it were
<br>to start recording. hdparm is sort of mystical as to where it gets<br>it's values, but does give us an idea. I am using a promise SATA300<br>TX4 controller with 5 seagate ST3250824AS drives (250MB each and<br>SATA300) running in software RAID5. Here is a non loaded hdparm
<br>output.</blockquote><div><br>Oh, Sorry. I glanced over that. Anyways the DMA problem I was referring to <br>was not anything to do with the hard drives it was the DMA used to transfer<br>from the hauppage card to memory.
<br> </div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">tv1 mythtv # hdparm -Tt /dev/md2<br><br>/dev/md2:<br> Timing cached reads: 1596 MB in
2.00 seconds = 797.50 MB/sec<br> Timing buffered disk reads: 230 MB in 3.01 seconds = 76.40 MB/sec<br></blockquote></div><br>These are the numbers I was looking for. Still a little low for raid5 as a single<br>non raided seagate
7200.10 sata2 disk gets around that but I assume these <br>are last year drives.<br><br># hdparm -tT /dev/sda<br><br>/dev/sda:<br> Timing cached reads: 1354 MB in 2.00 seconds = 677.44 MB/sec<br> Timing buffered disk reads: 232 MB in
3.01 seconds = 77.17 MB/sec<br><br><br>John<br>