Who is the Great Milton Friedman?

Milton Friedman was a monetarist and developed most of the monetarist theory used today. He was a great believer in the power of the free market and much of his work was based around this. Friedman was a professor of economics at Chicago University and produced much of his best-known work during his tenure.

Friedman is known for coming up with two major contributions to the economic policy debate. The first being the Quantity Theory of Money, stated that (M) the amount of money in circulation multiplied by (V) the velocity of circulation of that money is equal to (P) the average price level multiplied by (T) the number of transactions taking place (MV = PT). If the money supply grew faster than the underlying growth rate of output this would lead to inflation. It was in this work that he developed his best known thesis.

His second main contribution was the Expectations-augmented Phillips Curve. The Phillips Curve showed a trade-off between unemployment and inflation. In the 1970s there was a problem with the Phillips Curve,it could not explain unemployment and inflation going up together. Friedman came up with the solution of stagflation occurring, to include the role of expectations in the Phillips Curve, thus giving it the name ‘expectations-augmented’ Phillips Curve.

Milton Friedman will always be associated with monetarism. Monetarism can be defined as the belief that the money supply, or the total amount money in circulation in a given country’s economy at a given time, is the most important economic measure. At the age of 68 received a Nobel in 1976 for his work in monetarism. His work remains highly influential and is still highly controversial.

2 Minute SCSI Overview

SCSI is basically a fast communications bus, which allows users to connect multiple devices to their computers. Shugart Associates first introduced SCSI technology in 1981 in conjunction with NCR. It is predominantly used in high-end workstations and servers and offers a variety of speed and connection variations. There are several types of SCSI available such as Ultra, Fast, Wide, and Fast/Wide SCSI. Each type utilizes different variations of bus widths, bus speeds, and throughput capabilities, which ranges from 4 – 160 MBps. The benefits of SCSI are that it is very fast and reliable and allows you to connect eight to sixteen devices on one bus in a daisy chain fashion.

At the heart of SCSI technology is the controller, which is utilized as the interface between all of the devices on the SCSI bus and the computer. The controller is commonly referred to as the host bus adapter. Another main reason SCSI is widely utilized is that it offers the capability of RAID (Redundant Array of Independent Disks) technology. RAID allows the use of a series of independent disk to be connected together and used as one logical disk. This increases performance and provides fault tolerance with the high speeds of SCSI technology.

RAID – Redundant Array of Independent Disks

RAID (Redundant Array of Independent Disks) technology combines multiple inexpensive disk drives into a single array of independent disks. This method of combining multiple drives appears to the computer as one logical storage unit. It is used to obtain performance, capacity, and reliability, which exceed the capability of a single disk.

One of the basic fundamentals of RAID technology is striping and parity. Striping partitions the storage space of each drive into stripes and data is stored sequentially on each disk. In the event of a drive failure only the data on that particular drive needs to be recreated. Parity is the technology used to regenerate the data on the failed drive. There are 6 basic types of RAID architecture: RAID 0 through RAID 5. Each type provides disk fault tolerance with different feature and performance.

RAID 0: Typically defined as a group of striped disk drives without parity for data redundancy. Raid 0 arrays can be configured with large stripes for multi-user-environment or small strips for single user systems.

RAID 1: Simply a pair of disks drives that store duplicate data but appear to the computer as single drive. RAID 1 is also known as mirroring in which all writes going to each drive is the same so all information on each drive is identical.

RAID 2: Stores data by sectoring data across groups of drives with some drives assigned to store ECC information

RAID 3: Stores data by sectoring data across groups of drives leaving one drive dedicated to storing parity information. In the event that one of the drives is damaged or fails the parity information can be used to restore the data on that disk.

RAID 4: RAID 4 is identical to Raid 3 except that large stripes are used so that records can be read from any individual drive in the array except for the parity drive.

RAID 5: Under RAID 5 parity information is written across all drives. Since there is no parity drive all drives containing data and read operations can be overlapped on every drive in the array. RAID 5 combines efficient, fault tolerant data storage with good performance characteristics.

A Brief Overview of the iSCSI Technology

iSCSI is the convergence of the dominant protocol for block storage I/O with IP, the dominant protocol for computer internetworking. The combination of SCSI and IP would allow users to build a storage area network (SAN) utilizing existing Ethernet networks. iSCSI is an end-to-end protocol for transporting storage I/O block data over an IP network. The basic idea of iSCSI is to take advantage of existing IP network to acquire all the benefits of Storage Area Networks without the cost of implementing a SAN using Fiber Channel. IP networks are cost effective and they provide security, scalability, interoperability, network management, and storage management.

iSCSI uses the TCP/IP protocol to transport block level SCSI commands and data between client/servers and SAN targets. iSCSI utilizes host bus adapters which take block level data and encapsulate into a TCP/IP packet. The packet is then transported over an Ethernet network to the SAN target where another iSCSI adapter de-encapsulation the packet back to block level data where SCSI commands can be executed. Initially iSCSI was hindered by the fact that the encapsulation of block level data into a TCP/IP packet created a tremendous load on the CPU, which interfered with its ability to perform other operations. To rectify this problem, TOE (TCP/IP Offload Engines) were created to take the TCP/IP processing from the host CPU and completes TCP/IP processing and packet creation on the host bus adapter (iSCSI adapter).

5 Ways to Avoid Calf Cramps

If you are a runner, then I am sure that you will know about calf cramps.

Imagine this scenario if you will. Let’s say that you are 7.5k into a 10k run and the road starts to incline. Ever so slightly, but enough to put that extra strain on your legs as you try to maintain contact with the leaders. And the temperature? Well, it’s the morning, but it’s hot and liable to get hotter before the end. And to make matters worse, you were so desperate to maintain contact with the leading group, that you forgot to take on liquid at the last feeding station. And did you use tight fitting calf length socks? I know they are all the rage, but why did you do it?

So what do we have here?

  • Extra strain on muscles?
  • Dehydration?
  • Loss of essentials salts?
  • Restriction of blood flow?

All in all, I think that we are describing running calf cramps, waiting to happen.

I am not sure that anyone has definitive answer to the cause of cramps, but there are certainly several steps that you can take which could help save you from disaster during competition, in any sport.

1. A Proper Warm Up

Ok, I know you know, but did you do it? If not, then those cramps could be coming. Seriously, if you have been involved in any sport to any level, then you will be aware of the importance of a proper warm up. And I don’t just mean a brisk walk up the stairs to the changing room either! A proper warm up should include a routine that gently stretches your muscles to get them ready for the increased exertion, and gets your blood flowing around your body. Not only will a warm help prevent calf cramps, they will also help prevent some of the injuries that might occur when you put sudden strain on cold muscles.

And whilst we are talking of warm ups, don’t forget warm downs as well. Warming down after exercise can also help prevent cramping and reduce the risk of injury.

2. Train Hard, Run Easy

Have you heard this before? No? Well you should give it some thought, because it’s true. When you train for a sport, not only do you practice the necessary skills required to execute which ever event you are competing in, but you are also training your body for the rigours of the event. To given an exaggerated example, if you train for a sprint, and then try and run a marathon, your body won’t be ready. If you try it, I think you could be in for some serious cramps.

Remember, train hard, run easy.

3. Water is Sport’s Life Blood

Whenever you start to exercise, you start to sweat (or you should). Sweat is nature’s way of cooling you down when you get hot, so, it’s a good thing. And since your body is mainly made of water, then you should have plenty, shouldn’t you? Well, considering that you lose moisture from your body when you breathe, sweating does take a lot of fluid out of your system.

And your body will demand that it be replaced!

If you start feeling dizzy, or experience a rapid heart beat, then these could be signs that you are starting to dehydrate. I will take it as read that if your mouth and lips feel dry, then you should be taking water on board. It is not always possible to take on fluid during sport, but always have some available as soon as you are able to drink.

4. Sport Ain’t No Catwalk.

It’s true! Sport is not a fashion parade. If you think it is, then you are hanging out in the wrong place! There’s nothing wrong with looking cool whilst you compete, but be practical. Don’t risk injury (or cramps) by wearing clothing that is too tight, and that restricts your body’s movement, either externally or via blood flow. Believe me, I know. When I was younger, I used tie up’s on my socks whilst playing soccer (not as a fashion statement you’ll understand), just to keep my socks up and my shin guards inside my socks. Three quarters of the way through a game, my calves would tighten up, and I would roll on the floor in agony. Once it was understood, that I ‘only had cramp’, I was the object of much derision, but believe me, cramp is far from funny if you are the one suffering.

Wear appropriate clothing.

5. Eat Properly.

When you are sweating and working hard, not only do you lose water, you also lose nutrients. There is speculation that that athletes who get calf cramps could suffer from low levels of potassium, sodium, calcium, magnesium, and phosphorus. I am not suggesting that you do low level analysis of your breakfast cereal, but the message is clear. Look after your body, and your body will look after you.

Eat sensibly, and eat the right foods.