RAID
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This document discusses different RAID levels for providing reliability and performance in storage systems. RAID 0 uses striping for maximum performance but no redundancy. RAID 1 uses mirroring for fault tolerance and improved read performance at the cost of write performance and storage capacity. RAID 5 distributes parity across disks for high read performance and efficiency well suited for file and database servers.
RAID
- 1. RAID Redundant Array of Inexpensive or Independent Disks
- 2. Software, Hardware or combination  reliability via redundancy. SANO/S, 3rd Party
- 3. RAID 0 – Striping/Concatenation  No fault tolerance.  Optimized performance.
- 4. RAID 1 - Mirroring  Fault-tolerant.  Improves read performance .  High Availability.  May degrade write performance.  Highest cost.  Accounting, Payroll, Financial
- 5. RAID 0/1 - Stripe then Mirror  Single disk fault tolerance  High performance  Very expensive/High overhead  Imaging applications, General fileserver
- 6. RAID 1/0 - Mirror then Stripe  better fault tolerance  High performance and maximum reliability  Very expensive/High overhead
- 7. RAID 3  Dedicated parity disk  Very high data transfer rate.  high efficiency  Video Production, live streaming, Image Editing.
- 8. RAID 5  Distributed Parity Blocks  Highest Read data transaction rate  high efficiency  File and Application servers, Database servers