We had a new fire suppression guy testing our system for our computer room, and unbeknownst to him, one of the tests that he did triggered the EPO. One of my co-workers was in the room, which had about 20 racks of equipment, and he told me afterwards that for a quick second he thought he died. He said that that going from all that noise to eerie quiet was very disconcerting. rgt On Wed, Sep 15, 2021 at 7:51 PM Billy Croan <BCroan@unrealservers.net> wrote:
Indeed. Few sounds in the data center haunt me quite as much as a sensation that the decibel level has just decreased significantly.
On Wed, Sep 15, 2021, 4:14 PM Keith Stokes <keiths@salonbiz.com> wrote:
The bigger thing to notice is the *lack* of noise as every server, switch and storage system spins down.
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Keith Stokes
On Sep 15, 2021, at 3:50 PM, Stephen Satchell <list@satchell.net> wrote:
In the data centers I've worked in over the decades, those Big Red Buttons would activate a normally-closed contactor in a breaker panel. When pushed, the contactor would open, and turn off all the circults in said breaker panel. Not affected are lights, convenience outlets, door locks, and other non-data loads. Resetting the contactor to the working position was done after throwing all the breakers to the off position, and then turn on each breaker, one at a time.
The only noise that I have ever heard when the Big Red Button was pushed was the loud BANG as the contactor operated. You hear a similar bang in movies in scenes where lights in a large area are turned on and off.
Nothing like the BANG of a 600-amp 3-phase breaker tripping -- experienced that at University of Illinois Center for Advanced Computation. You immediately look for the person holding a gun.