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RAID Data Recovery (64)
RAIDXpert istool based on web-application that allows you to create, edit, delete, and repair of the matrix on system with a motherboard based on AMD platform. It allows you to create schedules and alarms, and remote configuration of notification about the state of our matrix. To accomplish anything in this tool, we must first turn on.
The matrix of the sixth level is the highest in the list of standard RAIDs, which will be described. Similar to RAID 5E/5EE, RAID 6 is an extended form of RAID 5 arrays The only difference is that instead of the built-in spare disk, the matrix of the sixth level has duplicated parity. Each "row" there are n-2 data blocks, where n is the number of disks in the array and two parity blocks. A simple - the ordinary checksum (such as RAID 5), and the other much more complicated.
RAID 1E, where the letter E comes from the word "Enhanced" is an extended and expanded version of the matrix of level one and belongs to the so-called non-standard RAID levels. This mode of RAID is also called striped mirroring, enhanced mirroring or a hybrid mirroring.
The first complicated level of RAID, which we'll make diagnostics is RAID 5. This level similar as RAID 0 is used to share data on the strips, with the difference that additional are calculated data of parity. That RAID has become popular due to the lowest mark-up to reduce the available space among the available levels of redundant arrays. RAID 5 requires a minimum of three drives and lose capacity of only on one from them. For comparison, in four-disks array configurations: RAID 1 losing capacity of three drives, RAID 1E, 5EE, 6, and 10 two, and RAID 5 only one.
Mirrored volume of the first level, creates copies of data on two or more disks. Most solutions, however, limits the number to two. You can work around this limitation by creating a nested array (eg RAID 1 with two RAID 1, which means RAID 11) of more in the description of RAID 10. In theory, the matrix of the first level provides the multiplication of performance in read similar to RAID 0, by reading the data from all components disks at a time.
JBOD "Just a Bunch Of Drives"-a combination of loose discs. This is called a non-RAID architecture that does not ensure and not improve the performanceand redundancy of the matrix. JBOD is means two concepts: the mapping of individual physical disks and logical partitions being on the within them to another logical volume and also combine disks to create one large volume. This second case is the more frequently used especially in the controllers on the motherboard. It also has the alternative name of SPAN, BIG or SLED (Single Large Expensive Drive). The general rule of the second case is sometimes called the reverse of partitioning. Rather than divide disks into smaller logical units we combine them into one large. It is particularly useful if you have a lot of small, hard to use disks in a different way, which in addition vary in size, so are not suitable for connection in RAID 0 (I will explain why in the description of the RAID level). Data on connected SPAN / BIG JBOD configurations are placed in sequence on each of the constituent drives. After filling the first disk the data is stored on further to the next.
What if our hard drive performance is not satisfactory, or would like to strengthen the security of stored data? The short answer is ... buy more efficient or more reliable drive! However, the situation gets complicated when we realize the fact that both faster and more reliable media can be just beyond our reach. Help comes with a RAID.
What if our hard drive performance is not satisfactory, or would like to strengthen the security of stored data? The short answer is ... buy more efficient or more reliable drive! However, the situation gets complicated when we realize the fact that both faster and more reliable media can be just beyond our reach (for example: 1 TB SSD;]). Then with the help of RAID comes - redundant array of independent disk. Actually, what is RAID? Which type of array to choose? How to build a RAID? How many disks you need for each type of RAID?
It is possible to make changes to the matrix apparently requiring re-installation of the system without its implementation. However, this requires an additional hard drive with a significant amount of free space on it, or at least 50 to 100% (this is dependent on the choice of compression) of space for extra hard with the amount of data stored on the array. An example of such an operation will serve the change of the Strip Size 128KB to 32KB value. After collecting the appropriate amount of free space get to work.
For the employee commencing work in the data center level of knowledge required to perform duties on a very low level. Schools teach the basics, which, although they are very helpful, they are just the basics. This is probably partly due to lack of access to the latest technology, for which no university can not afford, and partly from the lack of communication between universities and business. Meanwhile, companies are replacing the equipment every few (three to five) years, and the ability, for example, write "bash fork() bomb" turns out to be useless in the face of the need to maintain SLAs for system availability. Therefore, two basic elements for the state to be a good specialist in the data center is the ability to quickly learn and master, guru, an experienced colleague - ready to pass their knowledge.
If these two conditions are met, it is a good chance that over time the apprentice IT gets more reliable information about the cover system performance and will be able to effectively use them. Why are not sure that that happens? Mainly for this reason that the parameters commonly available equipment does not tell us directly about the real possibilities. To a large extent to blame for this state of things be met by producers, which exposes the fashion conscious marketing numbers, and not all sellers are discovering their true meaning.
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