1 00:00:00,581 --> 00:00:02,870 HVAC, or the heating, ventilation, 2 00:00:02,870 --> 00:00:05,250 and air conditioning system is really important 3 00:00:05,250 --> 00:00:07,540 to our facilities, especially those containing 4 00:00:07,540 --> 00:00:10,060 sensitive computer equipment and servers. 5 00:00:10,060 --> 00:00:12,700 Computers and servers tend to release a lot of heat 6 00:00:12,700 --> 00:00:15,610 during their operations, and that heat has to be dissipated 7 00:00:15,610 --> 00:00:19,120 or it can shut down the server or cause it to overheat. 8 00:00:19,120 --> 00:00:21,670 Now, to solve this problem, servers and computers rely 9 00:00:21,670 --> 00:00:24,410 on their own system fans to draw in cool air 10 00:00:24,410 --> 00:00:27,080 over that motherboard and exhaust out hot air 11 00:00:27,080 --> 00:00:28,420 out into the room. 12 00:00:28,420 --> 00:00:30,080 Over time, though, the room will become 13 00:00:30,080 --> 00:00:32,450 hotter and hotter and hotter if we didn't have 14 00:00:32,450 --> 00:00:34,990 a good HVAC system to cool it down. 15 00:00:34,990 --> 00:00:37,760 Now, to best circulate the air around the server room, 16 00:00:37,760 --> 00:00:40,530 you should design it with hot and cold aisles. 17 00:00:40,530 --> 00:00:42,450 This allows all of the front of the server racks 18 00:00:42,450 --> 00:00:45,240 to be facing each other, making designated cold aisles 19 00:00:45,240 --> 00:00:46,370 where you'll be working, 20 00:00:46,370 --> 00:00:48,360 while expending all of their heat out the rear 21 00:00:48,360 --> 00:00:49,940 of their cabinets to what we call 22 00:00:49,940 --> 00:00:51,650 the designated hot aisle. 23 00:00:51,650 --> 00:00:53,870 Now, by focusing on the hot and cold aisles, 24 00:00:53,870 --> 00:00:56,300 this allows us to set up better ventilation systems, 25 00:00:56,300 --> 00:00:58,560 using our raised floors in a server room, 26 00:00:58,560 --> 00:01:01,540 and dissipating that heat much more effectively. 27 00:01:01,540 --> 00:01:04,030 Now, another use of an HVAC system is to maintain 28 00:01:04,030 --> 00:01:06,690 the right humidity level in that server room. 29 00:01:06,690 --> 00:01:08,830 After all, if there's too little humidity, 30 00:01:08,830 --> 00:01:10,560 static electricity can build up 31 00:01:10,560 --> 00:01:12,300 and cause electrostatic discharge 32 00:01:12,300 --> 00:01:13,860 that can damage your components, 33 00:01:13,860 --> 00:01:16,360 just as you learned back in your A+ studies. 34 00:01:16,360 --> 00:01:18,440 Now, if you have humidity that's too high, 35 00:01:18,440 --> 00:01:20,770 condensation can occur when that cold air 36 00:01:20,770 --> 00:01:22,310 touches those hot servers, 37 00:01:22,310 --> 00:01:24,290 and this can cause corrosion of the components 38 00:01:24,290 --> 00:01:25,930 and damage to them, as well. 39 00:01:25,930 --> 00:01:28,040 To get the best humidity settings though, 40 00:01:28,040 --> 00:01:30,210 what you want to look for is an HVAC system 41 00:01:30,210 --> 00:01:31,640 that attempts to keep the humidity 42 00:01:31,640 --> 00:01:33,600 at sound 40% at all times. 43 00:01:33,600 --> 00:01:36,320 That's not too high and it's not too low. 44 00:01:36,320 --> 00:01:38,560 Now, many HVAC systems are also connected 45 00:01:38,560 --> 00:01:42,200 to your organization's ICS, or industrial control systems, 46 00:01:42,200 --> 00:01:45,050 or your SCADA systems, your supervisory control 47 00:01:45,050 --> 00:01:47,080 and data acquisition systems. 48 00:01:47,080 --> 00:01:49,250 This is a specialized network that's going to control 49 00:01:49,250 --> 00:01:52,100 all of your manufacturing and facility systems. 50 00:01:52,100 --> 00:01:54,280 This allows a remote operator to maintain awareness 51 00:01:54,280 --> 00:01:55,990 of the humidity and temperature 52 00:01:55,990 --> 00:01:57,580 in various parts of the building, 53 00:01:57,580 --> 00:01:58,810 and insure that the HVAC 54 00:01:58,810 --> 00:02:01,460 is functioning properly at all times. 55 00:02:01,460 --> 00:02:03,460 Because your HVAC needs power to run 56 00:02:03,460 --> 00:02:05,810 and be able to dissipate all that heat in the server room, 57 00:02:05,810 --> 00:02:08,420 you need to be aware that if a power outage occurs, 58 00:02:08,420 --> 00:02:10,630 this can cause a loss of your HVAC. 59 00:02:10,630 --> 00:02:12,900 Now, if you lose your HVAC, you need to think about 60 00:02:12,900 --> 00:02:15,000 what servers do you need to remain up 61 00:02:15,000 --> 00:02:16,800 and which ones would you shut down 62 00:02:16,800 --> 00:02:18,470 to try to minimize the amount of heat 63 00:02:18,470 --> 00:02:20,310 that's being produced, until you can get 64 00:02:20,310 --> 00:02:22,200 your air conditioning back online 65 00:02:22,200 --> 00:02:23,373 and working once more.