[c-nsp] relation between heat and packet-loss

[Peter Hicks]

On 26 May 2011, at 10:54, Martin T wrote:

> I have a 1U server in the data-center, which is connected trough
> digital distribution frames to ISP Cisco 4500 series switch and from
> this switch to Cisco 7200 series router. ISP switch and router are in
> the same room(room A). Server is in another room(room B). Previous
> weekend I noticed heavy packet loss to my server and when I connected
> to the server over out-of-band management(another ISP, no equipment in
> room A) and pinged the default gateway of my server(Cisco 7200 in room
> A) results were around 90% packet loss. I'm aware, that there was some
> sort of AC malfunction in room A and that was the reason ISP provided
> to me in order to explain this heavy packet loss, but how could
> increase of temperature cause such packet loss?

Maybe look wider - what if one of their switches failed upstream and you and others were going through an alternate switched path with insufficient bandwidth to cater for failover - say, 10Mbps in failover versus 1Gbps in live.


Peter