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Non-standard RAID levels

Although all RAID implementations differ from the specification to some extent, some companies and open-source projects have developed non-standard RAID implementations that differ substantially from the standard. Additionally, there are non-RAID drive architectures, providing configurations of multiple hard drives not referred to by RAID acronyms.


Nested RAID levels

Nested RAID levels, also known as hybrid RAID, combine two or more of the standard RAID levels to gain performance, additional redundancy or both, as a result of combining properties of different standard RAID layouts. Nested RAID levels typically numbered using a series of numbers, where the most frequently used levels use two rooms. The first number in the numerical designation represents the lowest level RAID in "the stack", while the rightmost represents the highest multi-layered RAID level such as RAID 50 layers of data striping RAID 0 on top of the distributed parity in RAID 5. Nested RAID levels include RAID 01 and RAID 10 and RAID 100 and RAID 50, and RAID 60, which combines all the information alternation with other RAID techniques, the result is a scheme of layering, RAID 01 and RAID 10 is significantly different nested RAID levels.



Mid-Levels is an affluent residential area on Hong Kong Island in Hong Kong. It is located between Victoria Peak and Central. Residents are predominantly more affluent Hong Kong locals and expatriate professionals. The average level is divided into four areas: the average level of the West, the mid-level in the centre, stretching from the Garden in the West to Happy valley in the East), Mid-levels East in Causeway Bay, including gardens Lookout and mount Butler, and middle levels of the North, near the North point including Braemar hill. In addition to the panoramic views of Victoria harbour or the rest of the city or as it is also close to the centre and the Admiralty, which are both essential areas of business, providing easy and convenient access to the business people living in mid-levels. More attractive average level is its closeness to nature and a comparatively better air quality than many parts of Hong Kong island. Many wealthy people in Hong Kong are willing to pay higher prices for residential property for accommodation which is far away from pollution and staying so close to the city centre. Many streets are named after former governors of Hong Kong. Examples include Bonham road after George Bonham, 1848-1854 and Kennedy road after Arthur Edward Kennedy, 1872-1877. Many roads in the area are a short walk from the Central business district, which runs on the mid-levels escalator from Central. A variety of lodging options-from luxurious apartments to compact, almost premium. The cost of these apartments vary greatly depending on the size, location and age of the building. The cost ranges from a high of ten million dollars over five hundred million Hong Kong apartment in a Frank Gehry building. Many prestigious colleges and schools can be found in the middle levels, including the University of Hong Kong, St Francis Canossian College, island school, kings College, Ying WA girls school, St. Pauls coeducation College and St Josephs College to name a few. The sections of the escalator was being repaired in 2018 and 2019, with some sections closed for maintenance.


Lewes and Laughton Levels

The Lewes and Laughton Levels are an area of low-lying land bordering the River Ouse near Lewes and the Glynde Reach near Laughton in East Sussex, England. The area was probably a tidal inlet in Norman times, but by the early 14th century, some meadows had been created by building embankments. Conditions deteriorated later that century, and by 1537, most of the meadows were permanently flooded. Part of the problem was the buildup of shingle across the mouth of the Ouse, but in 1537 a scot tax was raised, and a new channel cut through the shingle. By the mid 17th century, shingle was again preventing the region from draining properly, until the new channel was reinstated around 1731. In 1758 John Smeaton surveyed the area with a view to improving it for agriculture. He suggested straightening and widening the river channel, raising the banks around meadows, and building a large sluice near Piddinghoe, to keep the tides out. Some dredging and widening were carried out, but the straightending and sluice were discarded. In 1788 William Jessop surveyed the river, with the main object the improvement of navigation. In the OUSE above Lewes turned into the river OUSE navigation, with 19 locks, and for the lower reaches of the river, he proposed a radical straightening and lifting of the shingle bar at the mouth of the river. The work was carried out by Lewis teacher and engineer, and was completed in 1795. Such processing Glynde achievements came in the period between 1796 and 1803, and as well as allows ships to reach Lewis, the faster moving tides drained the meadows much more efficiently. Improvements continued in the early 19th century under the leadership of John Ellman, the famous agronomist, who was Expenditor for Lewis and levels of Lawton. Severe flooding occurred in 1829, but the meadows are drained for 48 hours. Management of flood protection levels on Board of the river OUSE catchment in 1939, after the adoption of the law On land drainage in 1930. After three restructuring and subsequent privatization of the water industry, the responsibility passed to the Agency for environmental protection, who suggested in 2012 that the drainage function of the land plot shall be carried out by the local internal drainage Board. Lewes district Council objected, and agreed to Fund flood coastal erosion after environment Agency internal drainage district for the us was officially abolished from 31 March 2017.


Humberhead Levels

The Humberhead Levels is a national character area covering a large expanse of flat, low-lying land towards the western end of the Humber estuary in northern England. The levels occupy the former Glacial Lake Humber, an area bounded to the east by the Yorkshire Wolds and the northern Lincolnshire Edge, a limestone escarpment, and to the west by the southern part of the Yorkshire magnesian limestone ridge. In the north the levels merge into the slightly more undulating Vale of York close to the Escrick glacial moraine, and to the south merge into the Trent Vale.


Winter flooding of 2013–14 on the Somerset Levels

From December 2013 onwards the Somerset Levels suffered severe flooding as part of the wider 2013-2014 Atlantic winter storms in Europe and subsequent 2013–2014 United Kingdom winter floods. The Somerset Levels, or the Somerset Levels and Moors as they are less commonly but more correctly known, is a coastal plain and wetland area of central Somerset, in South West England, running south from the Mendip Hills to the Blackdown Hills. The levels of low-lying areas, approximately 10 to 12 feet 3 to 4 m above mean sea level O. D., which was prone to flooding freshwater and sometimes salt water flooding. People tried to drain the area for hundreds of years. In the Middle ages, the monasteries of Glastonbury, Athelney and Muchelney reclaimed and enclosed much of the land. Installed gutters and artificial rivers were built and pumping stations. During December 2013 and January 2014, torrential rains led to extensive flooding with over 600 homes and 17.000 acres of 6.900 ha of agricultural land, including marshes to the North, Curry and hay Moors and Greylake affected. The villages of thorney and Muchelney had been cut off with many houses flooded. Northmoor green, which is better known as the wasteland, is also seriously injured. Activities on liquidation of consequences of floods included the use of rescue boats and the army. High volume pumps were imported from Holland and installed at several points to try to alleviate flooding. There was a requirement for ongoing dredging of the main rivers, although the experts of hydrology decided that it will not materially help to solve the problem of flooding. Prince Charles and several high-ranking politicians visited the area and disagreements about the role of the environment Agency. Better farming and development practices, and some drainage work has been recommended to reduce the risk of flooding in the area.

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