1
00:00:00,590 --> 00:00:03,860
In this video, we're going to talk about cloud computing.

2
00:00:05,210 --> 00:00:10,310
Now most of us are familiar with the concept of running an operating system on a PC.

3
00:00:10,610 --> 00:00:13,760
So as an example, I've got a Windows seven PC.

4
00:00:14,060 --> 00:00:18,290
This is a Windows seven operating system installed on a physical server.

5
00:00:18,740 --> 00:00:23,120
I'm connecting to that Windows PC using Microsoft Remote Desktop.

6
00:00:25,020 --> 00:00:28,200
And I'm using a mac for these recordings.

7
00:00:28,500 --> 00:00:34,110
So I've got a mac and I'm running Genius three as an example locally on my mac.

8
00:00:34,560 --> 00:00:42,540
Now, in the same way that operating systems are installed on laptops and PCs, servers in the past

9
00:00:42,540 --> 00:00:49,950
were physical PCs that you would install operating systems on and you would run applications on individual

10
00:00:49,950 --> 00:00:51,240
physical servers.

11
00:00:51,630 --> 00:00:59,430
So as an example, if you wanted a email server, you would order a physical server, you would install

12
00:00:59,430 --> 00:01:05,250
the Windows operating system and then you would install exchange and configure exchange to give you

13
00:01:05,250 --> 00:01:05,970
email.

14
00:01:06,210 --> 00:01:12,180
If you wanted a file server, you would order a physical server, then you would install windows on

15
00:01:12,180 --> 00:01:16,020
it and then you would store your files on that physical server.

16
00:01:16,440 --> 00:01:22,710
If you wanted a web server, you would order a third server, install an operating system such as Linux

17
00:01:22,710 --> 00:01:29,130
or Windows on that server, and then run a web server using IIS or Apache.

18
00:01:29,370 --> 00:01:35,940
So in the past, companies had physical servers, and in many cases it was one server per function.

19
00:01:36,030 --> 00:01:43,230
If you needed a file server, an email server, a web server, a database server, etc., you would

20
00:01:43,230 --> 00:01:47,850
buy a physical server per application.

21
00:01:48,760 --> 00:01:53,530
And if you needed more capacity, you would buy more physical servers.

22
00:01:53,800 --> 00:01:55,960
Now, in many cases, that's inefficient.

23
00:01:56,080 --> 00:02:03,970
Not all applications require all the memory and all the CPU on a physical PC all the time.

24
00:02:04,150 --> 00:02:08,050
So for a number of years, there's been a trend to virtualization.

25
00:02:08,229 --> 00:02:15,100
In other words, you've virtualize the operating system in what are called virtual machines rather than

26
00:02:15,100 --> 00:02:21,010
running individual operating systems on bare metal or physical PCs.

27
00:02:21,040 --> 00:02:29,830
You run operating systems in virtual machines and you host multiple servers virtually on a single physical

28
00:02:29,830 --> 00:02:30,460
server.