Erbil Polytechnic University Erbil Technical Engineering College Information System Engineering First Semester Raid Name: Naznaz Sami Bahra Abdulbast Abdulla Gailani Azad Hamad Supervisor D.Selar Othman 2023 - 2024 Sheama Pshtewan Arivan Ismahil Contents Content ……………..……...………………………....................................2 Raid……………………………………………………………….………………..….3 Type of raid …………………..……………..………….………………………..3 Scenario…….……………………………………………………..………………..3 5 Advantage of using Raid………………….…….…….……..….………4 Conclusion ……………….……………………………….………………………..5 Reference ……………………………………………………………………………5 Raid 2 Raid RAID, which stands for Redundant Array of Inexpensive Disks, is a method of storing the same data in different places on multiple hard disks to protect data in the case of a drive failure. It combines multiple physical hard drives into a single logical unit. By doing this, RAID increases the reliability and performance of data storage. There are several different RAID levels, each designed for different scenarios. Some of the most commonly used RAID levels include: RAID 0 (data striping): This RAID level splits your files into blocks and scatters them across your physical storage units, thereby increasing the overall performance (read and write speeds). However, RAID 0 offers no data redundancy and thus has no effect on data security. If one of the disks fails, all of the data is permanently gone. RAID 1 (data mirroring): RAID 1 simply mirrors your data between two drives within the RAID. So whenever you write some data to one of the drives in a pair, this data is automatically replicated on the other drive. This provides data redundancy so that if one disk fails, you always have its partner disk with the same information working properly. RAID 5 (data striping and parity): RAID 5 offers good redundancy and relatively good performance. It uses a minimum of three drives. Blocks within this configuration are striped with distributed parity. In case of data loss, distributed parity allows recalculating the data of one of the blocks. That means that RAID 5 can withstand the loss of one drive and continue working without data loss. RAID 10 (data striping and mirroring): RAID 10 conflates RAID 0 and RAID 1 into a nested setup that offers both high performance and disk failure tolerance. It is essentially a RAID 0 that consists of RAIDs 1. So the files you store on RAID 10 are first split into blocks that are then placed on various RAIDs 1, which then, in turn, duplicate all those blocks between two drives in a pair Given a scenario where a server needs to backup its data and requires both space and speed, RAID 5 or RAID 10 would be a good choice. RAID 5 uses a more efficient method known as parity instead of duplicating data like RAID 1, making it a more space-efficient solution. It also offers good read performance and can withstand a single drive failure. RAID 10, on the other hand, offers the benefits of both RAID 0 and RAID 1, ensuring fast read and write speeds, high redundancy, and easy rebuilds, while still being able to use half of the total space of all of your drives. However, it is important to note that while RAID can protect against hardware failure, it is not a substitute for a backup system. Data on a RAID system can still be lost due to other reasons such as accidental deletion, malware or ransomware attacks, or a catastrophic event like a fire or flood. Therefore, a comprehensive backup strategy, such as the 3-2-1 backup strategy (three Raid 3 copies of your data, with two on different media and one offsite), should still be implemented alongside a RAID system. Advantage of using Raid: RAID (Redundant Array of Inexpensive Disks) offers several advantages when used in a backup system: 1 Increased Storage Capacity: RAID combines multiple disk drives into a single logical unit, thereby increasing the overall storage capacity. This is particularly useful when large amounts of data need to be backed up. 2 Fault Tolerance: Most RAID levels provide data redundancy, which means that even if one disk fails, the data can still be accessed from the remaining disks. This helps protect against data loss due to hardware failure. 3 Improved Performance: Depending on the RAID level used, RAID can improve the speed of data read and write operations. This can be especially beneficial for backup systems that need to handle large amounts of data. 4 Data Protection: Certain RAID levels, like RAID 1 (mirroring) and RAID 5 (striping with parity), provide data protection by duplicating the data or distributing parity information across the drives. This means that even if one drive fails, the data can still be reconstructed. 5 Cost-Effectiveness: RAID can be a cost-effective solution for data backup as it uses multiple inexpensive disks to create a large storage unit instead of relying on a single expensive large capacity disk. However, it's important to remember that while RAID can help protect against hardware failure, it's not a substitute for a proper backup system. RAID doesn't protect against data loss due to reasons like accidental deletion, malware attacks, or catastrophic events. Therefore, RAID should be used as part of a comprehensive backup strategy, not as a standalone solution Raid 4 Conclusion In conclusion, RAID (Redundant Array of Inexpensive Disks) is a method of storing data across multiple hard disks to increase storage capacity, improve performance, and provide fault tolerance. It offers several advantages when used in a backup system, including increased storage capacity, improved data read and write speeds, fault tolerance, data protection, and cost-effectiveness. Different RAID levels, such as RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10, provide different benefits depending on the specific requirements for performance and redundancy. However, while RAID can protect against hardware failure, it is not a replacement for a comprehensive backup system. RAID doesn't protect against data loss due to other reasons such as accidental deletion, malware attacks, or catastrophic events. Therefore, a comprehensive backup strategy should be implemented alongside a RAID system. References: https://phoenixnap.com/kb/raid-levels-and-types https://www.datanumen.com/blogs/5-top-advantages-common-raid-systems/ https://www.techtarget.com/searchdatabackup/tip/RAID-vs-backup-Learn-the-differencesand-benefits-of-both https://www.prepressure.com/library/technology/raid https://www.diskinternals.com/raid-recovery/benefits-of-raid/ https://www.baeldung.com/cs/raid-intro Raid 5
