Recently, in the global computer press has begun to appear quite a few articles on the topic "Why RAID-5 is bad” (here are some examples: one, two, and others).
We will try to explain why RAID-5 has worked so far, but now it suddenly stopped.
The capacity of hard drives has been growing without any specific tendency to a stoppage over the past few years. In addition, the capacity of the drives almost doubles every year, but their data transfer rate does not increase much over the same period. Yes, indeed, the drives get interfaces, such as SATA and SATA-II, and SATA-III is on its way, but there is a question “would these drives work faster?” or they just get new interfaces with the numbers of theoretical characteristics.
The usage of hard drives tells us that the capacity grows and the speed does not.
IBM Research scientists have successfully demonstrated the ability to store one bit of information in as few as 12 magnetic atoms. Today’s disk drives use about one million atoms to store a single bit of information. The ability to manipulate matter by its most basic components — atom by atom — could lead to the vital understanding necessary to build smaller, faster and more energy-efficient devices.
MIT researchers have created a new camera that can acquire visual data at a rate of one trillion exposures per second (1 000 000 000 000 = 10^12). That’s fast enough to produce a slow-motion video of a burst of light traveling the length of a one-liter bottle, bouncing off the cap and reflecting back to the bottle’s bottom. The similar devices will be used in medicine and other branches of science in the future.
We tested several configurations of disk arrays that are suitable for use in servers.
We tested the following configurations:
- 4 x 300GB SAS2 10K + RAID10 on a PCI-E 2.0 controller (Reference 4 x 300GB RAID10)
- PCI-E SSD 120GB MLC (Inexpensive PCI-E SSD 120GB)
- 2 x SSD 120GB MLC + RAID0 on a PCI-E 2.0 controller with optimized firmware (Inexpensive 2 х SSD 120GB RAID0)
- 4 x 300GB SAS2 10K + RAID10 on a PCI-E 2.0 controller + SSD MLC 120GB caching I/O (Hybrid 4 x 300GB RAID10 + SSD caching)
Here are the results of user poll on the SSD reliability that could be useful.
Let us begin with the size statistics.
The picture shows that the most popular formats are 120, 80 and 60, which are released only by Intel.
It is also noticed that the drives with capacity of 120 / 128 are particularly popular among users of alternative operating systems (including OS X).
It was reported in the summer that an unnamed pair of ex-Apple’s engineers on behalf of an unnamed startup is going to present an unnamed product. It turned out that they were Tony Fadell, Apple’s former Senior Vice President of the iPod division and the leading engineer Matt Rogers. They use the iPod click wheel in the new product.
This is not a music player of the new generation, instead they developed a thermostat. The new startup of Tony Fadell and Nest Labs decided to add to the design and purposefulness of Apple standard in those boxes that are installed on the walls of a quarter million American homes and offices, which control their internal temperature. Why? Fadell is sure that all existing thermostats are ugly and too difficult to use. He wants to do something that no one ever thinks about, and make it as a favorite object in the house.
How the battery goes dead: we all have seen how this happens in the phones, laptops, cameras, and the electric vehicles. It is painful process - if you are lucky – it could be slow. Over the years, the lithium-ion battery, which once powered your devices for the several hours (even days!), gradually loses its ability to hold the charge. After all we accept it, maybe curse Steve Jobs, and then we buy a new battery or a new gadget.
But why is this happening? What happens in a battery that causes it to go dead? The short answer lies in the fact that due to the damage from continuous effect of high temperatures and a large number of charging and discharging cycles, it eventually begins to break down the process of moving ions between the electrodes of lithium.
A more detailed answer, which lead us through the description of unwanted chemical reactions, corrosion, or a threat of high temperatures and other factors affecting the performance, It begins from an explanation, what is happening in the lithium-ion batteries, when everything works well.
PREDICTION: Apple to release iPhone 5 on October 4 and start shipping by the end of October.
Apple reportedly plans to release the golden master of iOS 5, its forthcoming operating system update for the iPhone, iPad and iPod touch, to its overseas assemblers at some point between September 23 and September 30, on time for a mid-October launch of a fifth-generation iPhone.
Analyst Ming-Chi Kuo revealed to AppleInsider on Monday that the new iPhone and iPod touch went into mass production in late August, and assemblers are currently scheduled to receive the golden master of iOS 5 the week of September 30. Typically, a golden master version of software is identical to the code that eventually becomes the final release to the public.
If you remember, Marty McFly worn Nike Mags in Back to the Future II. What could be better than auto lacing shoes? Nike thought so as well and patented these precious ideas. Now comes year 2011 and Nike finally releases Nike Mag.
But sadly commercial says that we'll see a real tech only in 2015, but for now you can buy a pair of Nike Mags with blinking lights which last for 4 hours on one charge. Availability of 1500 pairs auctioned on eBay and donated to the Michael J. Fox. One pair can go as high as $3000-$35000.