Report : ' Raid '

Storage of data plays a major role in improving the performance of a company and this can happen either offline or online and in various formats.

RAID 1 will perform the operations to write as well as read the same data, which is called is called as mirroring. It is data is back-up, it might not be safe and have a high chance of risk to protect the data. RAID 1 is preferred for mirroring and duplexing. It has a high level of reliability and availability. It has disk in a mirrored array which has an identical image of user data. It prefers array with parallel access for achieving the high transfer rate and also to increase the performance for read-intensive application at high cost. If the data is being deleted unwantedly, then the data will also be removed from the mirrored copy. If the disk attacked by the virus the files

RAID 3 uses striping at byte level and the dedicated parity bits are stored in separate disk on the drive.

11. Which of the following answers best describes how a hard disk drive physically writes a binary 0

Hard Disc Drive: a HDD is like a person's long term memory. it is used to store any type of data from files to applications. The data on a HDD is non-volatile, which means the data will stay on the disc even if the computer is switched off. A SSD is another way to store data, but it is faster than a HDD because there are no moving parts.

Reduce time to access the required data: DDBMS allows to store copies of a data in multiple branches.

The use of data in today’s commercials is a vital role that cannot be overlooked. That is there is a need to backup data on physical mediums. The main mediums are hard-drive, flash drive, optical disc, and tape drive. There is multiply different version of each main type of medium. These different physical mediums store data in different ways. Fragmentation can also be an issue for some of these physical mediums. I will cover each medium in a little depth because of the different types available in today’s market.

The aim of work is to provide service guarantees when multiple synchronous requests are present with high disk throughput. To address this problem we consider BFQ and modified versions of BFQ. It is found that MBFQV1 gives a better performance when compared with the BFQ. MBFQV2 is the suggested new disk scheduler which preserve both guarantees and a high throughput. In MBFQV2 we observed that the throughput, speed of transfer were better compared to the other schedulers for the normal size applications.

Storage Devices connect to the motherboard using AT Attachment (ATA). Like RAM, ATA use busses to transfer data. Older storage devices use PATA (Parallel ATA), which have a bus width of 16 bits (2 bytes) and as such have slow data transfer speeds (up to 133 Mbit/s). The more modern SATA (Serial ATA) was released January 7, 2003, and has much higher transfer speeds. As of now, five types of SATA are available: SATA 1.0 (1.5Gbit/s), SATA 2.0 (3Gbit/s), SATA 3.0 (6Gbit/s), SATA 3.1 and SATA 3.2.

If you want to extend a simple volume, you can use only the available space on the same disk if the volume is to remain simple.

This is technically RAID 1 + RAID 0 that is a combination of RAID 1 and RAID 0 using mirroring and striping, but without parity. RAID 10 has the same fault tolerance as RAID level 1. The main feature of this level is that mirroring leads to the tolerance of the failure of one drive. This level is ideal for database servers and any environment with many small random data writes.

It is the type of disk in which the space is fixed. it doesn’t matter how much data you store.

RAID (redundant array of independent disks), is a method of staring virtual data on separate disk drives that combine to make a single logical unit for the purpose of data redundancy. Data is distributed to across the drives depending on the required level of performance and redundancy. There can be up to 6 RAID levels. RAID level 1 consists of data mirroring without parity. Data is written identically to two drives. When the data is requested to every drive in the set then it will be serviced by the drive that read the information first. This method is slow because if one drive needs updated then the other drive will need to be too. If one drive fails to function, it does not matter because the second drive can still produce the same output. RAID 2 consists of bit-level striping

Level 1 of RAID is called Mirroring. Information or data is stored away twice by writing them to both the mirror drive and data drive. The

Host-side storage software. Much work has been done on analyzing the reliability of general storage software [22, 28–32]. For example, our previous framework [31] simulates failures at the driver layer and analyzes the recovery capability of databases.