[Linux-cluster] GFS + CORAID Performance Problem

[Jayson Vantuyl]

> My thanks to Jayson and especially Wendy for providing so much help  
> with this issue.  With a little help from Coraid, I've troubleshot  
> the performance issues down to one of the two ports on the Coraid  
> device.  In the end, I was able to move the performance problem  
> from on of my two hosts to the other just by swapping ports.  I'll  
> follow up with Coraid to see if I have a hardware problem.
I don't know what Coraid recommends, but I usually recommend not  
plugging devices directly into the ports.  I vastly prefer having a  
good gigabit switch there instead.  Here at Engine Yard, we actually  
have two switches that provide redundancy across either port.  The  
current AoE driver is good enough to use both networks to spread the  
load if you have two independent network paths, so you also get  
better performance.  We actually have separate cards in each of our  
servers to prevent failure of an individual network card from being  
an issue (and AoE should handle this well as long as the driver  
doesn't crash in this state).

In terms of clustering, having redundant networks is very handy-- 
especially if you use a qdisk.

> It's really nice to have such a great level of community support.   
> Wendy, I'd be happy to share the particulars on my deployment once  
> I get things stabilized.
I'd be interested too.

-- 
Jayson Vantuyl
Systems Architect
Engine Yard
jvantuyl at engineyard.com


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