[CentOS] OT: hardware question

[Giles Coochey]

On 16/09/2014 22:35, Valeri Galtsev wrote:
> I would use riser 1. If you use riser 2, you will create more 
> resistance to airflow in area where already is one big heater. I 
> assume, there are no separators of airflow going from front to end (or 
> from middle where the set of fans are usually situated). My guess 
> would be chips facing down have much less effect on effectiveness of 
> cooling unless your configuration is such that airflow path along 
> chips (i.e. underneath that board in riser 1) is totally blocked.

I concur here, my guess is to use riser 1

If it were me, I would add the temperature sensors to my monitoring and 
change it if I thought it was too high.

If you have two servers have one in riser 1 and the other in riser 2 - 
Assuming the manufacturer hasn't got a recommendation or warning about 
using either.
I would then add both to monitoring, and if there was any massive 
difference in temperature or perhaps even performance (not all PCI-Es 
are the same) then I would schedule a maintenance window to swap one of 
the cards in one of the servers after deployment.

-- 
Regards,

Giles Coochey, CCNP, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 8444 780677
+44 (0) 7584 634135
http://www.coochey.net
http://www.netsecspec.co.uk
giles at coochey.net