On Fri, 2 Mar 2012, Brian Candler wrote:
On Fri, Mar 02, 2012 at 03:33:19PM +0200, Harald Hannelius wrote:
The pattern for me starts to look like this;
max-write-speed ~= <link speed>/nodes.
This is most odd. If you are using a regular replicated+distributed (not
striped) volume, then each file operation will be directed to one pair of
servers. The dd should just hit two servers and the other two will be idle.
So I don't see why your 4-node setup should perform any differently to a
2-node one.
I'll have to test with just a two-way replica, and see if I get better
performance out of that. I'm gonna loose the capability to have one node at
the other site then, but write performance is more important right now.
It could be a good idea to have another ethernet-connection interconnect
private between the nodes as well, I suppose?
Hopefully 10Gbps will get cheaper soon.
--
Harald Hannelius | harald.hannelius/a\arcada.fi | +358 50 594 1020
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