Hi,
On Wed, Jul 2, 2014 at 11:33 PM, Sebastian Goetze spgoetze@gmail.com wrote:
Just a quick note: Mark is correct, the 8040 (just like the rest of the 8000 series) is limited to 8 nodes if you're using SAN and 24 nodes if you're using only NAS protocols. (The 2xxx and previous generation models don't all scale to 24 nodes NAS)
Yes, I'm aware of the 8 nodes limit in SAN environment and it's OK for my environment.
But on another note: Did you mean SAS + SATA for every *node*?
Yes, correct. I'm going to build two separate domains (separate SAS HBA ports): one for SAS and one for SATA.
Why not use (in a HA pair) one node for SAS and one node for SATA?
My experience (with workloads I have) is that this approach leads to unbalanced controllers in terms of CPU isage, ie a controller that handles SAS traffic becomes ~ 50% CPU bus way faster than a controller with SATA only workload on it.
You will get (slightly) better performance compared to using 'mixed nodes' and won't lose flexibility as far as I can see. And then you could 'fill up' one rack with SAS and the other with SATA... (not that you couldn't do that anyway, but the cabling and sorting out which shelf belongs to whom might be easier)
Just my 2c
Sebastian