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</o:shapelayout></xml><![endif]--></head><body lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>I too can confirm this when a staff member ‘accidentally’ hit the gas release instead of the door release. We ended up having to replace 80% of our SAN’s disks due to both failure and predictive failure.<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>From what I can determine the gas nozzles is what dictates the noise variable and the pressure has to be there to a) extinguish the fire and b) because the contents are under pressure and is therefore unavoidable.<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>A interesting side-effect that we noted was out Dell SAN’s had a safety cut-off that when they ‘detected’ the issue the stopped all the disks and we have zero failures in that kit. I was quite impressed by this.<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td colspan=5 valign=bottom style='padding:0cm 0cm 0cm 0cm'><p class=MsoNormal style='line-height:13.5pt'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>James Troy<o:p></o:p></span></p><p class=MsoNormal style='line-height:13.5pt'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:#243C98'>Senior Systems Administration</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'><o:p></o:p></span></p></td></tr><tr><td colspan=5 valign=top style='padding:0cm 0cm 0cm 0cm'><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="100%" style='width:100.0%'><tr style='height:7.5pt'><td style='padding:0cm 0cm 0cm 0cm;height:7.5pt'><p class=MsoNormal style='line-height:7.5pt'><span style='font-size:7.5pt'> <o:p></o:p></span></p></td></tr><tr style='height:.75pt'><td style='border:none;border-top:solid #DEDEDE 1.0pt;padding:0cm 0cm 0cm 0cm;height:.75pt'><p class=MsoNormal style='mso-line-height-alt:.75pt'><span style='font-size:1.0pt'> <o:p></o:p></span></p></td></tr><tr style='height:9.0pt'><td style='padding:0cm 0cm 0cm 0cm;height:9.0pt'><p class=MsoNormal style='line-height:9.0pt'><span style='font-size:9.0pt'> <o:p></o:p></span></p></td></tr></table></td></tr><tr style='height:7.5pt'><td nowrap valign=top style='padding:0cm 0cm 0cm 0cm;height:7.5pt'><p class=MsoNormal style='line-height:11.25pt'><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black'>0412 449 074<o:p></o:p></span></p><p class=MsoNormal style='line-height:11.25pt'><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black'>james.troy@agilityapplications.com<o:p></o:p></span></p></td><td width=40 nowrap style='width:30.0pt;padding:0cm 0cm 0cm 0cm;height:7.5pt'><p class=MsoNormal style='mso-line-height-alt:7.5pt'><span style='font-size:13.5pt;font-family:"Times New Roman",serif;color:black'> <o:p></o:p></span></p></td><td nowrap valign=top style='padding:0cm 0cm 0cm 0cm;height:7.5pt'><p class=MsoNormal style='line-height:11.25pt'><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black'>Level 11, 356 Collins St<o:p></o:p></span></p><p class=MsoNormal style='line-height:11.25pt'><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black'>Melbourne VIC 3000<o:p></o:p></span></p><p class=MsoNormal style='line-height:11.25pt'><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black'>PO Box 2795 | New Farm QLD 4005<o:p></o:p></span></p><p class=MsoNormal style='line-height:11.25pt'><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black'><a href="http://agilityapplications.com/" target="_blank"><b><span style='color:black;text-decoration:none'>agilityapplications.com</span></b></a><o:p></o:p></span></p></td><td width=40 nowrap style='width:30.0pt;padding:0cm 0cm 0cm 0cm;height:7.5pt'><p class=MsoNormal style='mso-line-height-alt:7.5pt'><span style='font-size:13.5pt;font-family:"Times New Roman",serif;color:black'> <o:p></o:p></span></p></td><td nowrap style='padding:0cm 0cm 0cm 0cm;height:7.5pt'><p class=MsoNormal style='line-height:11.25pt'><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#243C98'><img border=0 width=135 height=53 style='width:1.4097in;height:.5486in' id="Picture_x0020_1" src="cid:image002.png@01D49381.CED86760" alt="Agility Applications"><o:p></o:p></span></p></td></tr><tr><td colspan=5 valign=top style='padding:0cm 0cm 0cm 0cm'><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="100%" style='width:100.0%'><tr style='height:11.25pt'><td style='padding:0cm 0cm 0cm 0cm;height:11.25pt'><p class=MsoNormal style='mso-line-height-alt:11.25pt'><span style='font-size:11.5pt'> <o:p></o:p></span></p></td></tr><tr style='height:.75pt'><td style='border:none;border-top:solid #DEDEDE 1.0pt;padding:0cm 0cm 0cm 0cm;height:.75pt'><p class=MsoNormal style='mso-line-height-alt:.75pt'><span style='font-size:1.0pt'> <o:p></o:p></span></p></td></tr><tr style='height:7.5pt'><td style='padding:0cm 0cm 0cm 0cm;height:7.5pt'><p class=MsoNormal style='line-height:7.5pt'><span style='font-size:7.5pt'> <o:p></o:p></span></p></td></tr></table></td></tr></table><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> AusNOG <ausnog-bounces@lists.ausnog.net> <b>On Behalf Of </b>Robert Hudson<br><b>Sent:</b> Friday, 14 December 2018 7:45 AM<br><b>To:</b> Bevan Slattery <bevan@slattery.net.au><br><b>Cc:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] [AUSNog] : Re Data Centre Fire Suppression Safety<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I can confirm that the sound/pressure wave from a gas discharge can, does and absolutely did destroy a lot of spinning disks in some very expensive kit (big data and database appliances) when such a system was accidently deployed in a datacentre I am familiar with.<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Fri, 14 Dec. 2018, 5:02 am Bevan Slattery <<a href="mailto:bevan@slattery.net.au">bevan@slattery.net.au</a> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><div><p class=MsoNormal>It’s pretty much all been said.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Halon (long gone). Reaction sucks oxygen out of air.<o:p></o:p></p></div><div><p class=MsoNormal>FM200 (safe but being phased out). Heard it can leave a residue despite the brochure saying not.<o:p></o:p></p></div><div><p class=MsoNormal>Inergen more common (and others like it). Fundamentally mostly nitrogen that drops oxygen below 15% and drops temperature. These are two components of a fire (heat, fuel and oxygen). People can operate comfortably below 15% oxygen. In fact at 10% you can still function more than enough to pick up your gear and leave the room.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I did quite a bit of research on reduced oxygen environments (hypoxic) which is used on (Firepass etc.) <a href="http://www.firepass.com/oxygen-reduction-fire" target="_blank">http://www.firepass.com/oxygen-reduction-fire</a> <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Obviously dry pipe is used a lot. The issues with gas suppression today are more around noise (and vibration) and temp drop and they relate to spinning disks and circuit boards, more than people.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The issues around dry pipe is, well when it goes off, it’s not very dry and water/equipment certainly doesn’t mix.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Cheers<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>B<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><div><div class=MsoNormal align=center style='text-align:center'><hr size=3 width="98%" align=center></div><div id="m_-6948049452514261626divRplyFwdMsg"><p class=MsoNormal><b><span style='color:black'>From:</span></b><span style='color:black'> AusNOG <<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>> on behalf of Paul Wilkins <<a href="mailto:paulwilkins369@gmail.com" target="_blank">paulwilkins369@gmail.com</a>><br><b>Sent:</b> Wednesday, December 12, 2018 3:53 pm<br><b>To:</b> <a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br><b>Subject:</b> [AusNOG] [AUSNog] : Re Data Centre Fire Suppression Safety <o:p></o:p></span></p><div><p class=MsoNormal><span style='color:black'> <o:p></o:p></span></p></div></div><div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Every data centre has a fire suppression system. We're not used to thinking of this as a hazardous environment, but consequent to<a href="https://www.theguardian.com/world/2018/dec/12/antarctica-two-technicians-dead-mcmurdo-station-ross-island" target="_blank">two techs being found dead working on a fire suppression system in Antarctica</a>, I find myself wondering yet again, why there aren't more stringent controls around the fire suppression systems in data centres: viz - when you enter a data centre, how confident can you be you're not going to be quietly asphyxiated?<br><br>Kind regards<br><br>Paul Wilkins<o:p></o:p></p></div></div></div></div><p class=MsoNormal>_______________________________________________<br>AusNOG mailing list<br><a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br><a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a><o:p></o:p></p></blockquote></div></div></body></html>