On Fri, Oct 29, 2010 at 11:23 AM, wang xuchen <span dir="ltr"><<a href="mailto:ben.wxc@gmail.com">ben.wxc@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Since either network nor hard-drive is the bottle-neck, I would assume that DRBD replication contribute most to the performance bottleneck, of course, with the premise that my configuration does not put any limitation on DRBD device.</blockquote>
<div><br></div><div>How do you know? What's your throughput on the SSD without DRBD? What do your netperf tests look like? What's the percentage decrease of DRBD on SSD write performance? What's your CPU utilization look like during writes?</div>
<div><br></div><div>-JR</div></div>