nanog mailing list archives
Re: Never push the Big Red Button
From: Robert Taylor <rgt () wi mit edu>
Date: Thu, 16 Sep 2021 00:18:49 -0400
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. --- 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.
Current thread:
- Re: Never push the Big Red Button (New York City subway failure), (continued)
- Re: Never push the Big Red Button (New York City subway failure) Baldur Norddahl (Sep 10)
- Re: Never push the Big Red Button (New York City subway failure) Warren Kumari (Sep 10)
- Re: Never push the Big Red Button (New York City subway failure) Tom Beecher (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) Fred Baker (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) Warren Kumari (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) William Herrin (Sep 15)
- Re: Never push the Big Red Button Stephen Satchell (Sep 15)
- Re: Never push the Big Red Button Keith Stokes (Sep 15)
- Re: Never push the Big Red Button Billy Croan (Sep 15)
- Re: Never push the Big Red Button Callan Banner (Sep 15)
- Re: Never push the Big Red Button Robert Taylor (Sep 16)
- Re: Never push the Big Red Button (New York City subway failure) Daniel Seagraves (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) Warren Kumari (Sep 10)
- Re: Never push the Big Red Button (New York City subway failure) Adam Thompson (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) Daniel Seagraves (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) William Herrin (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) Warren Kumari (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) bzs (Sep 15)
- Re: Never push the Big Red Button (New York City subway failure) Roy (Sep 15)