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.

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.

The first medium I want to cover is a hard-drive that is used inside computers and servers. A hard-drive can be broken up into different partitions, which sets up a volume with a single file system and a unique drive letter. These partitions of the hard-drive are kept track in a table called a partitions table. A hard-drive uses NTFS which breaks the drive into sectors of 512 bytes. These different sectors are stored

a File or space on the hard drive where data from RAM is "swapped" in order to preserve space.

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

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

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.

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.

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.

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.

This means that each piece of data is stored on the hard drive twice, or once on each disk. If a single hard drive where to fail, the data would still be accessible on the second disk/drive. RAID is very inexpensive and is incredibly reliable. Another concern is protecting their server, and thereby the EMR, from damages from the elements. Having recently witnessed New Orleans' experience with Hurricane Katrina, this is of concern to UCPGB. In order to protect their server from damage such as overheating, humidity, water, etc, UCPGB should consider co-locating their server. Co-location is a service that provides off-site server housing in environments designed to provide optimal functioning conditions. Services include redundant power, internet connectivity, cooling, security, and protection against environmental factors such as flooding and fires.

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

Intelligent storage systems use a RAID array controller concept that gives higher performance in I/O processing. Having larger capacity in cache improves more performance. Intelligent storage systems has added advantage