best raid for backup

. When the primary hard disk (physical) is damaged, the image hard disk replaces the primary hard disk. Because there is an image hard disk for data backup, the data security of RAID 1 is the best at all RAID levels. However, the disk utilization is only 50%, which is the lowest utilization of all RAID disks.

data can be written to two disks (each consumes 200G capacity), and then added to the data can only be written in the 500G of the disk. At this point, the effectiveness of the poor, because there is only one left to store data!What is RAID-1RAID-1 (mapping mode, mirror): Full backup. This mode also needs the same disk capacity, preferably the same disk! If the disk of different capacity is composed of

1.RAID Description RAID is an abbreviation for the English Redundant Array of Inexpensive disks, abbreviated as a redundant array of inexpensive disks. Simply put, RAID is a combination of multiple separate hard disks (physical hard disks) in different ways to form a hard disk group (logical hard disk), providing higher storage performance than a single hard driv

the number of hard disk multiples, the other write speed has a small decrease. As long as a disk is normal to maintain operation, the highest reliability. The principle is that the data is stored on the primary hard drive and the same data is written on the mirrored drive. When the primary hard disk (physical) is damaged, the mirrored hard disk replaces the work of the primary hard disk. Data security for RAID 1 is best at all

, disk capacity is also larger, but the security of the data is significantly reduced, the number of disks, the lower the security of data, because RAID-0 this mode is no data backup, At the same time the same file is sliced and there are different disks, the data becomes very fragmented, once a disk is out of the question, then all the data on the RAID-0 disk ca

increases fault tolerance.Level classification for RAID:RAID 0: The data is evenly distributed across the array's disks in strips, so that the system has data requests that can be executed in parallel by multiple disks, each of which performs its own portion of the data request. The parallel operation on this data can make full use of the bus bandwidth, and significantly improve the overall disk access performance.Hardware requirements: Minimum of 2 disksPerformance advantages: Very high disk r

Raid 10 Vs. RAID 5 performance provides a Performance Data graph that uses sqlio. EXE to generate 8 KB random reads and writes, with a performance gap nearly doubled. Disk access time = disk seek time + latency Latency = 1 minute/RPM/2 The main factor determining iops is the array'sAlgorithm, Cache hit rate, and number of disks. The array algorithms vary depending on the array. For example, in hds

the system has data requests, it can be concurrently executed by multiple disks. Each disk executes its own data requests. This type of parallel operations on data can make full use of the bandwidth of the bus, significantly improving the overall disk access performance. Because reading and writing are done in parallel on the device, the Read and Write Performance will increase, which is usually the main reason for running RAID 0. However,

) are provided for backup or data recovery in other RAID modes. Therefore, we recommend that you do not0 array stores important data or installs the system on it, because the storage and exchange of a large number of temporary swap files is the true advantage of RAID 0.4. Q: I have two hard disks with different specifications. Can I use

reduced, and the more disk performance is better for RAID0, the less complete the data will be when a hard drive fails. Therefore, the risk of this approach is high, there is no security to speak of. RAID1 It can be so understood that he is to make up for the shortcomings of RAID0, the model of the hard disk requires two identical hard drive to make up, if two hard disk is not the same size, he will be small hard drive to the main. The biggest benefit of this

Problem Can you restore RAID data by rebuilding the RAID structure when the raid is corrupted and data loss occurs? There is a large percentage of RAID information loss in a data disaster that occurs in a disk array environment, and many engineers have the experience of rebuilding

efficiency. 4. If a non-large hard disk is used, when a small disk is full, data is directly written to a disk with a large space. 5. The minimum number of disks is 2, and the disk usage is 100%. The cause is that, in case of a problem with one of the disks, all the data will go wrong. Because data is stored separately. Raid 1: Image backup This mode stores the same data in different disks. The same dat

Raid is the abbreviation of Redundant Array of Independent Disks ). [Note: A disk array is a technology used by a hard disk controller to control the connection between multiple hard disks. This allows read/write synchronization between multiple hard disks, reduces errors, and increases efficiency and reliability. This technology is implemented by the disk array product. The physical form is that a long square body contains several hard disks and oth

We know that the capacity of a single disk storage data is limited, in order to increase the capacity of the disk, we can combine a number of smaller disks together to form a larger disk device, which is a raid (stand-alone disk array), RAID can not only improve the storage capacity of data, but also improve the data protection function, Different levels of RAID,

RAID (Redundant array of Inexpensive disks): Redundant array of independent hard disks, the basic idea is to combine multiple small hard disks together into a disk group to achieve performance improvement or capacity increase or redundancy through the management of software or hardware. Software RAID: The soft array provides the most basic raid fault tolerance th

series of changes and developments. In the home market, we can only see RAID 0, RAID 1, and RAID 0 + 1 disk arrays. However, since the birth of the DFI Lanparty motherboard, We have ushered in the fourth disk array method, RAID 1.5.In practical applications, most of the scenarios where

controller. It does not use host resources. They have NVRAM for the cached read and write. When the cache is used for RAID rebuilds, it uses the backed up battery power to keep the cache, even if a power failure occurs. For large-scale use is very expensive investment.The hardware RAID card looks like this:Hardware RAIDImportant RAID Concepts The checks

Enterprise-level database applications are mostly deployed on RAID disk array servers, which can improve disk access performance and implement fault tolerance and Disaster Tolerance. RAID (redundant disk array ), Enterprise-level database applications are mostly deployed on RAID disk array servers, which can improve disk access performance and implement fault tol

increase, which is also the main reason for using RAID-0. However, RAID-0 does not have data redundancy. If the drive fails, no data can be restored. Therefore, RAID-0 is generally used in businesses that require high reading of devices but do not require data security. RAID-1 is also called Mirroring.

accessed is evenly distributed to multiple hard disks as much as possible in the form of strips. During read and write operations on multiple hard disks at the same time, the data read and write speed is improved. Another purpose of RAID 0 is to obtain a larger "single" disk capacity. Raid 1 is also known as mirror or flushing ing. This kind of work method is designed for data security. It automatically co