[Info-vax] Pile of RX2660s

[JF Mezei]

On 13-12-29 19:59, Stephen Hoffman wrote:

> <http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c01163996-13.pdf> 

##
Data Center Server
Twelve fans cool the Data Center server. The fans are all redundant,
hot-swappable, and interchangeable (page 145)
##

So, if they are all redundant, why not remove them all and solve the
noise problem :-)


Later, it explains the cooling is done in 3 zones, each consisting of 4
fans. Only one fan per zone can fail. So only 1 fan in 4 is redundant.

BTW, does having 2 fans in series really make a huge difference in airflow ?


> the fans differ, the fan carriers differ, the main boards differ, and 
> there are other details that also either imply or indicate differences.

i can understand the fans being different, I can understand the
SMC/firmware that contrtols fan speed being different. But would the
motherboard need to be different at all ?


Out of curiosity, are those enclosures and fan systems similar to what
HP uses for its 8086 servers ? Or does Itanium require significantly
more cooling and thus more powerful fans (and more fans) ?