<br><br><div class="gmail_quote">On Thu, Feb 14, 2008 at 9:22 AM, John Drescher <<a href="mailto:drescherjm@gmail.com">drescherjm@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">> raid5/6 has the problem that for each write he must read from all other<br>
> disk to generate the new hash values.<br>
><br>
<br>
</div>You can lessen this effect if you set a big stripe cache.<br>
<br>
echo "2048" >> /sys/block/mdX/md/stripe_cache_size<br>
<br>
Where X is your array<br>
<font color="#888888"><br>
John<br>
</font></blockquote></div><br>Don't you have to do that when you first create your md array? I really don't know much about the internals of the md software, I just know it's working for me. I've got 5x500GB drives in a RAID5. I have a problem with playback on the same machine when it's recording/comm flagging an HD program and i'm trying to watch a recording. But this has to do with the FE/Master BE being an Athlon 2600+ with a gig of PC2700 memory than the array being the problem.<br>
<br>Jim<br>