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RAID

Transcript: RAID DISADVANTAGE RAID-6 RAID 4 comprises block-level striping with dedicated parity. RAID 4 was previously used primarily by NetApp, but has now been largely replaced by an implementation of RAID 6 (RAID-DP). Defi. & History RAID is a storage technology that combines multiple disk drive components into a logical unit for the purposes of data redundancy and performance improvement. The term "RAID" was first used by David Patterson Garth A. Gibson, and Randy Katz at the University of California, Berkeley in 1987, standing for redundant array of inexpensive disks The foremost advantage of using a RAID drive is that it increases the performance and reliability of the system.The RAIDThe parity involves that the data from the crashed system be matched up with the data that is stored in the other disk.The parity check and thus it regularly checks for any possibility of a system crash. RAID-4 RAID-2 RAID 4 comprises block-level striping with dedicated parity. RAID 4 was previously used primarily by NetApp, but has now been largely replaced by an implementation of RAID 6 (RAID-DP). Standard Levels RAID 5 comprises block-level striping with distributed parity. Unlike in RAID 4, parity information is distributed among the drives. . Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost. . RAID 3 comprises byte-level striping with dedicated parity. All disk spindle rotation is synchronized and data is striped Parity is calculated across corresponding bytes and stored on a dedicated parity drive. Hardev Khehra DCS-1235 AGENDA RAID 0 comprises striping . This level provides no data redundancy nor fault tolerance, but improves performance through parallelism of read and write operations across multiple drives. RAID 0 has no error detection mechanism, so the failure of one disk causes the loss of all data on the array ADVANTAGE 1. Defi and History 2. Raid-0 3. Raid-1 4. Raid-2 5. Raid-3 6. Raid-4 7. Raid-5 8. Raid-6 9. Advantages 10. Disadvantages 11. Any question A major disadvantage regarding the RAID drive is that there needs to be written the drivers for a Network Operating System (NOS). Hence the major fact and also the most important usage of the RAID system is that it is essentially designed and extensively used in a server. So when the server comes into the picture, there obviously has to be a network. RAID-3 RAID- 0 RAID 2 comprises bit-level striping with dedicated Hamming-code parity. All disk spindle rotation is synchronized and data is striped such that each sequential bit is on a different drive.Hamming-code parity is calculated across corresponding bits and stored on at least one parity drive. RAID 6 comprises block-level striping with double distributed parity. Double parity provides fault tolerance up to two failed drives.As with RAID 5, a single drive failure results in reduced performance of the entire array until the failed drive has been replaced RAID-1 RAID-5 RAID-4 RAID 1 comprises mirroring. Data are written identically to two (or more) drives, thereby producing a "mirrored set". The read request is serviced by any of the drives containing the requested data. This can improve performance if data is read from the disk with the least seek latency and rotational latency.

RAID

Transcript: RAID Redundant Array of Inexpensive or Independent Disks. RAID is the term used to describe a storage systems' resilience to disk failure through the use of multiple disks and by the use of data distribution and correction techniques. Disadvantages. RAID-What is Raid? Why RAID COMMON CHARACTERISTICS Reliability Overhead Cost. Usable Storage Capacity percentage. performance. Fault tolerance and recovery. RAID LEVELS. There are 7 Basic RAID levels. RAID 0. RAID 1. RAID 2. RAID 3. RAID 4. RAID 5. RAID 6. And there are some combinations of Different RAID levels. Y.M.Rezwanul Mannaf How to Evaluate? As more devices are added reliability deteriorates. Files may be striped across multiple drives. Creating redundancy in the system. Rebuild files from redundant information. It may cause a huge loss if we fail to chose right RAID level. Affordable Alternative to Mass Storage. --> Cost/Megabyte is Dropping. -->Smaller Drive Makes it Possible. -->Obtain Performance of Expensive High End Disk. High Throughput And Reliability. -->Use of Small Diameter Disk. --> Seek Distances Lower. --> High I/O Rates and Less power. Software RAID: --> Software RAID tends to offer duplication or mirroring. --> It uses more system resources as more disk ports and channels are required. -->It is subject to additional load during write and copy operations. --> It may have lower cost than hardware RAID. Software and/or Hardware RAID RAID 0. Advantages RAID is a great system for increasing speed and availability of data. More data protection than non-RAID disk systems. Fulfills the needs of multimedia and other data hungry programs. Provides fault tolerance. Protect from MTBF. Improve performance and greater capacity. A Set of Common Physical Disks or Drives. The Operating System Views this Separate Disks as a Single Logical Disk. Data Are Distributed Across the Physical Drives of the Array. Redundant Disk Capacity is Used to Store Parity Information. Parity Information Can Help in recovering Data in Case of Disk Failure.

RAID in Project Management

Transcript: Understanding RAID in Project Management Dependency Management RAID, which stands for Risks, Assumptions, Issues, and Dependencies, is a vital tool for project management to track and address critical elements that can impact the project's success. Definition and Purpose of RAID Task B completion dependent on timely Task A finish. Close monitoring of Task A's progress ensures seamless project flow and avoids delays. RAID is a systematic approach used in project management to identify and manage Risks, Assumptions, Issues, and Dependencies throughout the project lifecycle, ensuring proactive risk mitigation and optimal project outcomes. Issues Resolution Consistent Update Importance Server downtime causing delays, resolved by expediting server repair with IT support. Timely resolution crucial to maintain project momentum. Regular RAID log updates vital to proactive risk mitigation and issue resolution. Ensures project stays on track and risks are actively managed throughout the project lifecycle. Importance of Tracking Elements Assumptions Documentation Collaborative Review in Meetings Assumption: client will provide data on time. Regular follow-ups with the client ensure timely data delivery, crucial for project progression. Periodic review of RAID log in project meetings essential for collective understanding and action. Facilitates collaboration and focused efforts to address project elements effectively. Tracking Risks, Assumptions, Issues, and Dependencies with the RAID framework enables project teams to anticipate and address potential obstacles, enhance decision-making, and maintain project alignment with objectives and timelines. Combined Image Search Keywords Click to add text Sample Risks Entry Filled-Out RAID Log Example Explore a detailed example showcasing entries for Risks, Assumptions, Issues, and Dependencies in a filled-out RAID log. Key supplier may delay component delivery, impacting project timelines. Contingency plan being developed with alternative suppliers to mitigate risk. Enhancing Project Flexibility RAID in Project Management By customizing the template, project managers can enhance flexibility in responding to evolving project dynamics and unforeseen challenges, leading to improved project outcomes and success. Adapting for Project Needs Customizing the RAID log involves adding specific columns like deadlines, priority levels, or detailed action descriptions to address the project's distinct demands. Tracking and Managing Risks, Assumptions, Issues, and Dependencies Risks: Potential Project Hazards Risks in project management refer to potential events or conditions that could have a negative impact on the project. Identifying and mitigating risks is crucial to project success and meeting objectives. Customizing the RAID Log Template Tailoring the RAID template to fit the unique requirements of your project ensures effective tracking and management of risks, assumptions, issues, and dependencies. Assumptions: Unverified Project Foundations Assumptions are beliefs considered to be true for the project to progress but are not confirmed. Documenting and validating assumptions help in ensuring the project's success and avoiding potential pitfalls. Issues: Current Project Problems Understanding RAID Components Delve into the key components of RAID - Risks, Assumptions, Issues, and Dependencies - essential for effective project management. Issues in project management are problems that have already occurred and require resolution. Addressing issues promptly is essential to prevent further impact on project timelines and deliverables. Dependencies: Task and Project Relationships Proactive Management for Project Success Dependencies in project management represent relationships between tasks or projects where the completion of one is reliant on the other. Managing dependencies ensures smooth progress and successful project outcomes. Proper management of RAID elements is proactive problem-solving. By identifying and addressing risks, assumptions, and dependencies early, project teams can maintain control and mitigate potential issues effectively. Categories in the Template Structure of a RAID Log The RAID template consists of key categories including Risks, Assumptions, Issues, and Dependencies. These categories ensure a comprehensive tracking system to identify, assess, and manage critical project elements effectively. A RAID log is organized into four main sections: Risks, Assumptions, Issues, and Dependencies. Each section captures specific elements crucial for proactive project management and mitigation strategies. Details for Each Category RAID Essentials: Risks, Assumptions, Issues, Dependencies Key Takeaways from RAID Implementation Within each category of the RAID log template, project teams detail specific information such as the description, impact, likelihood, owner, mitigation/action plan, and status of risks, assumptions, issues, and dependencies. This level of detail ensures

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