<div dir="ltr">Tim, the water mist type systems looked interesting - and are claimed to do no damage.<div><br></div><div>There is also a university HPC data centre in a rival city to yours not far away, where the server room has argon injected to keep the oxygen level below the point where combustion is not supported.</div><div>You can work in the server room, but are not allowed to be alone in the building.</div><div>I worked in there many years ago.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 19 April 2016 at 23:55, Lux, Jim (337C) <span dir="ltr"><<a href="mailto:james.p.lux@jpl.nasa.gov" target="_blank">james.p.lux@jpl.nasa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">And really, really expensive to replace.<br>
<br>
For just that Montreal Protocol reason.<br>
<br>
Besides, you have good backups and checkpoints, right? If your cluster<br>
catches fire, you order up a new cluster ³from the cloud² and continue<br>
work. Doesn¹t Amazon deliver these with big autonomous octocopters<br>
now?<grin><br>
<br>
But realistically,the need for ³non-damaging fire suppression² has gone<br>
away for a lot of data centers, since they have to have good disaster<br>
response plans with very fast response times compared to the 70s and 80s<br>
when ³batch² ruled the day. Imagine if you¹re handling stock transactions,<br>
or even something as mundane as home loans, with fairly tight time limits<br>
and downtime requirements. The regulators aren¹t going to be interested in<br>
your story about how you had all that Halon in your one data center, and<br>
then a flood wiped you out.<br>
<br>
If you¹ve got a geographically dispersed hot standby (or even just load<br>
sharing), you can use water to put the fire out enough to save lives, and<br>
let insurance haggle about the equipment replacement.<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
On 4/19/16, 1:39 PM, "Beowulf on behalf of Greg Lindahl"<br>
<div class="HOEnZb"><div class="h5"><<a href="mailto:beowulf-bounces@beowulf.org">beowulf-bounces@beowulf.org</a> on behalf of <a href="mailto:lindahl@pbm.com">lindahl@pbm.com</a>> wrote:<br>
<br>
>On Tue, Apr 19, 2016 at 07:32:38PM +0200, Per Jessen wrote:<br>
><br>
>> I thought halon gas was the usual choice for datacentres, has that gone<br>
>> out of fashion?<br>
><br>
>It was quite popular. However, it's not friendly to the ozone<br>
>layer... which means it's phased out due to the Montreal Protocol.<br>
><br>
>-- greg<br>
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