The most reliable RAID levels and what to do in case of failure
There are five different RAID levels available. Which one is right for you?
- How do you configure data for fast performance and maximum stability?
- RAID is a data storage model that utilizes several physical disk drives simultaneously.
- Learn which RAID configuration is the best for your needs.
RAID is a type of data storage technology that allows computer administrators to utilize several physical disk drives simultaneously. These can be either hard disc drives or the newer solid-state drives. If you have multiple storage drives linked together, it increases the overall storage capacity of your computer system.
Another benefit of a RAID configuration is that data does not get lost if one drive goes bad. After all, there is no telling when your data could become compromised because of a virus or system failure. But with the proper RAID configuration, you'll be able to retrieve lost data when something happens to your computer system or one of its storage drives.
RAID levels refer to the different ways in which data gets distributed to the storage drives of your system. You need to select the appropriate RAID level configuration to determine the structure and organization of your stored data. Some RAID levels are deemed more reliable than others.
The 5 RAID levels
Credit: Adobe Stock
There are five different RAID levels available. The one you choose will depend on your situation and what you need the RAID configuration to accomplish. You have to decide whether you want your RAID to offer fault tolerance, performance, or both.
Fault tolerance is what allows your computer system to continue to operate after it has a failed component or storage drive. You won't experience as many interruptions in the performance of your computer if your RAID level setup is fault tolerance friendly. Not only that, but you likely won't experience as much data loss either.
Therefore, the most reliable RAID levels will need to have a fault tolerance configuration. But you cannot just choose any RAID level because the number of storage drives will influence it too. That is why you need to pay attention to the number of drives available before ultimately deciding on a RAID level to configure.
Let's discuss the top three RAID level configuration options below.
The RAID 0 level writes data onto several disks. In other words, your computer uses multiple disk drives to write and read data to increase its performance. You need at least two disk drives to use RAID 0. If you want to see a better performance from your computer system, then RAID 0 is the right choice.
However, there is no fault tolerance with RAID 0. That means if one of your disks were to fail, then you would likely lose the data that was on it. Keep that in mind before you choose the RAID 0 configuration.
RAID 1 is one of the best levels for fault tolerance. Instead of stripping data and writing it across multiple disks, RAID 1 copies all of the data from one disk and puts it on another disk. It creates a replica of the data that gets stored onto a disk. That way, if your storage disk malfunctions and stops working, you'll have a backup of all the data that was on it.
So, why doesn't everyone use RAID 1? Well, unfortunately, RAID 1 will slow down the performance of your computer system tremendously. Also, you cannot increase the storage capacity of your computer with multiple disk drives. For example, if you have two 500GB disk drives with a RAID 1 configuration, you will still have a storage capacity of 500GB because each disk drive will contain the same data.
RAID 5 is like a hybrid level in terms of performance and fault tolerance. You will need at least three disk drives for this particular setup because the configuration is more complicated. If one disk drive fails, then you will still have a backup of the lost data. RAID 5 utilizes parity data on all the storage drives to retrieve lost data. Although writing data onto the drives is much slower, it can be read fast.
Most people would say that RAID 5 is the most reliable level because data is retrievable without jeopardizing the performance of the system. But again, the setup is somewhat complicated, and it requires you to understand more about hardware controllers and how to increase their cache memory. It is recommended that you use a professional computer technician to set up RAID 5 rather than rely on the automatic configuration of the software.
The main bioactive compound in catnip seems to protect cats from mosquitoes. It might protect humans, too.
- For centuries, humans have observed that cats exhibit strange behaviors when exposed to catnip and silver vine.
- A new study examined how the main bioactive compound in these plants affects cats' opioid systems and protects them against mosquito bites.
- The findings suggest that the compound nepetalactol could be used to develop new mosquito repellents for humans.
Nepeta cataria, commonly known as catnip
Johann Georg Sturm (Painter: Jacob Sturm) via WikiPedia/Public Domain<p>In the study, researchers from Iwate University in Japan exposed nepetalactol-laced paper to different types of felids, including domestic and feral cats, a leopard, two jaguars and two lynx. The team also exposed nepetalactol to dogs and mice, but only the cats elicited the expected behavioral response.</p><p>To find out why cats react uniquely to nepetalactol, the researchers measured the animals' endorphin levels before and after they were exposed to the substance. The results showed that nepetalactol raised endorphin levels in cats.</p><p>But when cats were given drugs that blocked opioid receptors, their endorphin levels didn't rise, and their behavior didn't change. This suggests that cats' "μ-opioid system is stimulated by an increase in endogenous β-endorphin secretion when olfactory neurons are activated by these iridoids," the team wrote.</p>
Nepetalactol as a mosquito repellent<p>To test the efficacy of nepetalactol as a mosquito repellant, the researchers anesthetized two groups of cats. For one group, the researchers applied nepetalactol to the cats' heads. The other group was left untreated to serve as a control. The researchers then exposed the cats to Asian tiger mosquitos and counted the number of times the insects bit each group.</p><p>The results showed that the group treated with nepetalactol was much less likely to get bitten, sometimes by as much as 50 percent. The same proved true in a "more natural" experiment, in which cats were allowed to rub their faces on the plants themselves.</p><p style="margin-left: 20px;">"This is convincing evidence that the characteristic rubbing and rolling response functions to transfer plant chemicals that provide mosquito repellency to cats," the team wrote.</p>
The world's deadliest animal<p>While the researchers don't fully understand why nepetalactol activates the μ-opioid system in cats, they think the compound could help humans avoid mosquito bites. After all, some of the study contributors have applied for a patent covering the use of nepetalactol as an insect repellent. Gizmodo <a href="https://gizmodo.com/cats-love-catnip-because-it-protects-them-from-mosquito-1846092518" target="_blank" rel="noopener noreferrer">reports</a> that the researchers even tried applying the compound to their arms, which seemed to prevent mosquito bites.</p><p>For thousands of years, humans have aimed to protect themselves from mosquitos. The Egyptian queen Cleopatra was said to sleep surrounded by a mosquito net. The Romans used vinegar mixtures. And Mississippians turned to the American beautyberry plant. </p><p>Today, DEET is the most widely used mosquito repellent, but it's slightly toxic and can cause side effects, including seizures, though rarely. Developing better mosquito repellents could save many lives. The World Mosquito Program <a href="https://www.worldmosquitoprogram.org/en/learn/mosquito-borne-diseases#:~:text=Nearly%20700%20million%20people%20contract,more%20than%20one%20million%20deaths." target="_blank">reports</a> that mosquito-borne illnesses like malaria and yellow fever affect more than 700 million annually and kill approximately one million. </p>
A unique exoplanet without clouds or haze was found by astrophysicists from Harvard and Smithsonian.
- Astronomers from Harvard and Smithsonian find a very rare "hot Jupiter" exoplanet without clouds or haze.
- Such planets were formed differently from others and offer unique research opportunities.
- Only one other such exoplanet was found previously.
Munazza Alam – a graduate student at the Center for Astrophysics | Harvard & Smithsonian.
Credit: Jackie Faherty
Jupiter's Colorful Cloud Bands Studied by Spacecraft<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="8a72dfe5b407b584cf867852c36211dc"><iframe type="lazy-iframe" data-runner-src="https://www.youtube.com/embed/GzUzCesfVuw?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
People often make a killing in stocks, but what else do people buy in hopes of selling for a fortune?
- Outside of stocks and bonds, some people make money investing in collectibles and make a fair amount on them.
- One stamp even sold for a billion times its face value.
- The extreme dependence on future collectability limits the potential of most of these opportunities.
Pokémon Cards<iframe width="730" height="430" src="https://www.youtube.com/embed/hVUmTaSoB5Y" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe><p> For those who weren't content to catch them all in a video game came a trading card game where you could collect them all. Some classic cards have gained tremendous stature among collectors and Pokéfanatics and sell for extremely high prices. </p><p> An older card featuring Charizard, a fire breathing dragon, regularly sells for thousands <a href="https://www.lifesuccessfully.com/gaming-articles/the-most-wanted-pokemon-cards-charizard#/" target="_blank" rel="noopener noreferrer">online</a>. Given that the card could be purchased for a couple of dollars in 1999, this is quite the return. A particular pack of the cards, which cost $5 in 2003, now sells for $650, one hundred and thirty times the original asking <a href="https://adamrybko.medium.com/stocks-or-pokemon-cards-an-introduction-to-alternative-investing-32fe499083c4" target="_blank" rel="noopener noreferrer">price</a>. </p><p> Of course, not every card will fetch these high prices. Buying cards as an investment is tricky. You have to essentially guess at which cards will be considered highly valuable at a later date and will be unable to collect any dividend before selling them.</p><p> Furthermore, you have to presume that people will be collecting the cards years after buying them. While Pokémon has remained popular, it is a bit of an outlier in terms of enduring success.</p>
Shoes<p> People from all walks of life, from skateboarders to the First Lady of the <a href="https://www.rappler.com/newsbreak/in-depth/imelda-marcos-shoes-mixed-legacy" target="_blank" rel="noopener noreferrer">Philippines</a>, enjoy collecting shoes. An entire subculture exists for people interested in collecting sneakers, and some people make quite a profit in it.</p><p> The Nike SB Dunk Low Reese Forbes Denims, priced initially at $65 in 2002, are commonly valued in the thousands of dollars now. The Nike Air Jordan 1 Retro High x Off White "Chicago" shoe sold for $190 a mere four years ago, but now sells for $4000 a <a href="https://sixfiguresneakerhead.com/sneaker-model-return-alternative-investment-stock-x-reseller/" target="_blank" rel="noopener noreferrer">pair</a>. </p><p> A <a href="https://www.huffpost.com/entry/sneakers-good-investment_n_5bd1f5ebe4b0d38b588143ee?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS8&guce_referrer_sig=AQAAALOu0F9zs5DBHHOIjMgHOZR6K88W3rZkyD3ftBMz2nzlHfoxD4MS2Iz1vF3H-a4_xzOWIIrsJyv76Gj6xwUXaRIRdjq7M2m7I6-lxihWIcEfs7F9PgOwnx82JXPfXmWL7-RQlNUufOyvd8V6TCzMEYrEjzMXVU77IWk9MjOEtsln" target="_blank" rel="noopener noreferrer">Huffington Post</a> article points out that most of these shoes offered better returns than gold over the same period. The same article quotes YouTube personality <a href="https://www.youtube.com/user/mrFOAMERSIMPSON" target="_blank" rel="noopener noreferrer">Mr. Foamer Simpson</a> and his explanation of the difficulties of making money on shoes:</p><p style="margin-left: 20px;"> "There's a guessing game or element of unpredictability that makes it exciting for some collectors. With sneakers, you kind of never know. Sure, you know what sneakers are more limited or which ones were harder to get, but even with that, it fluctuates a lot. A sneaker that was very valuable two years ago might all of a sudden crash and no longer be valuable."</p>
Toys of all kinds<iframe width="730" height="430" src="https://www.youtube.com/embed/0uYnj1i1EQw" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe><p> If there's one thing everybody loves, it's what they loved when they were children. That often translates into old and rare toys fetching insane prices at auction.</p><p> Beanie Babies, those little stuffed animals from the 90s, once sold at a price of thousands of dollars <a href="https://www.thefiscaltimes.com/2015/03/02/How-Great-Beanie-Baby-Bubble-Went-Bust" target="_blank" rel="noopener noreferrer">online</a>, not bad considering they sold for $5. Lego sets, particularly those featuring well-known franchises like Star Wars, can sell for hundreds of dollars <a href="https://finance.yahoo.com/news/20-geeky-collectibles-could-millions-201624881.html" target="_blank" rel="noopener noreferrer">online</a>. </p><p> As with Pokémon cards, the success stories are dependent on what people are interested in collecting long after most people forgot the toy existed.<strong> </strong>While some collectors have ideas on how to gauge what might or might not end up being valuable later, there seems to be a considerable amount of luck involved.</p>
Stamps<p> The hobby of kings has occasionally made some people as rich as one, with rare stamps and extensive collections fetching high prices at auction.</p><p> One of the famous "Inverted Jenny," stamps, a rare misprint showing an upside-down airplane, sold for $1,593,000 at <a href="https://www.linns.com/news/us-stamps-postal-history/2018/november/nov-15-jenny-invert-sale-record.html" target="_blank" rel="noopener noreferrer">auction</a>. The most valuable stamp in the world, the British Guiana 1c magenta, last sold for $9,480,000, a billion times its face <a href="http://www.sothebys.com/en/auctions/2014/magenta-n09154.html" target="_blank" rel="noopener noreferrer">value</a>. For those interested in a shorter-term investment, the USA Forever stamp has gained a face value of 75% since its introduction and can still be used to send a letter.</p>
Coins<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTUxNjY2Ny9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYzMjUwNzk3OX0.HMBXb1mbiL0D-JbFcD7pBWNZ8TcOB4mzcJ6ri2aCNOg/img.jpg?width=1245&coordinates=0%2C1%2C0%2C1&height=700" id="41fe2" class="rm-shortcode" data-rm-shortcode-id="57f1ae74688caf29e150c4ce2f7c5b41" data-rm-shortcode-name="rebelmouse-image" data-width="1245" data-height="700" />
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