raid6: using algorithm sse2x2 (2883 MB/s). So, 1% of that is reasonable? :-) Oh well, I guess I can wait until tomorrow for the rebuild to finish.<br><br><div class="gmail_quote">On Thu, May 19, 2011 at 2:12 PM, Adam Thompson <span dir="ltr"><<a href="mailto:athompso@athompso.net">athompso@athompso.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Look back in dmesg output for the RAID module speed tests, notice which one was selected, and divide that number by 2. There's your theoretical bottleneck on the CPU.<br>
Take the minimum sustained disk/channel/controller throughput, factor in interrupt latency, device driver efficiency, etc. and make a rough guess as to the overall throughput.<br>
Consider that md code seems to have a lot of write barriers for safety - so even a rebuild will aspens much of its time waiting for the disk to sync().<br>
All in all, I think your numbers are probably reasonable.<br>
<font color="#888888">-Adam<br>
</font><div><div></div><div class="h5"><br>
<br>
Kevin McGregor <<a href="mailto:kevin.a.mcgregor@gmail.com">kevin.a.mcgregor@gmail.com</a>> wrote:<br>
<br>
>I installed Ubuntu Server 10.04.2 LTS AMD64 on a HP ProLiant ML370 G3 (4 x<br>
>dual-core/hyperthreaded Xeon 2.66 GHz, 8 GB RAM) and I used the on-board<br>
>SCSI controller to manage 8 x 300 GB 15K RPM SCSI drives in a software RAID<br>
>5 set up as a 7-drive array with 1 hot-spare drive. All drives are the exact<br>
>same model with the same firmware version.<br>
><br>
>It's currently rebuilding the array (because I just created the array) and<br>
>/proc/mdstat is reporting "finish=165.7min speed=25856K/sec". Does that<br>
>sound "right" in the sense that it's the right order of magnitude? I though<br>
>it should be higher, but I haven't set up such an array before, so I don't<br>
>have anything to compare it to.<br>
><br>
>If it's slow, does anyone have a suggestion for speeding it up?<br>
><br>
>Kevin<br>
><br>
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