Logistics - Data Recovery

 RAID Array server and its different configurations

Advantages:

˘ The main advantage of a RAID drive is that it increases the performance and reliability of the system. The RAID drive is a convincing example that could be used in a server.

˘ Mirroring is the complete duplication of data. In other words mirroring is the 100 redundancy.

Only copying to the replacement is necessary.

˘ Mirroring & Striping - The performance of a server increases when Disk stripping is done - RAID Level 0+1 requires a minimum of 4 drives to implement. This is actually done by the interleaving of transport logistics or a group of bytes. The interleaving of this sort is done across multiple drives. Reading and writing of the data are done in a simultaneous process. High I/O rates are achieved by striping RAID 1 segments.

˘ The RAID regularly checks for any possibility of a system crash by increasing the parity check.

˘ The concept of parity comes after the concept and application of mirroring.
Data from the crashed system is matched with the data stored in the other
disk. This is called Parity. Parity is used to calculate the data in the two
drives and store the results in the third drive. In case there are more than
two drives parity check is done on all of them and the results are stored on
a completely different drive. The preferable device may be the RAID 3 (Striping With Dedicated Parity) or RAID 5 (Striping With Distributed Parity).

Very high rate of transfer when data is being accessed in large chunks sequentially.

Disadvantages:

˘ A major disadvantage regarding the RAID drive is that drivers for a Network Operating System (NOS) need to be written. The most important usage of the lodging system is that it is primarily designed and widely used in a server. So when the server comes into the picture, there obviously has to be a network. Hence the device drivers should be included so as to design the system. The design is a quite complex process as far as the RAID is concerned.

˘ Administrators find it very difficult to configure a RAID system. The
ability to dynamically enlarge the RAID server is also a complex process;
especially for those administrators who are the IS managers and also LAN administrators.

˘ Another main disadvantage is that the system should support RAID drives.
Most of the RAID drives include the different types like the RAID 0, RAID 1, and RAID 2 etc. Hence if the server system is using a different type of RAID drive and that is not supported by the system, then the problem of availability may arise.

˘ Initially one has to determine the type of RAID drives that is compatible.

Different system supports different types of RAID drives. DGR (Storage
Dimensions Dynamic Growth) technology allows the administrator of any network system to reconfigure the Storage Dimensions RAID System.