RAID - Consists of 7 levels
- RAID is a data storage virtualization technology that combines multiple physical disk drive components into a single logical unit for the purposes of data redundancy, performance improvement, or both:
- Set of physical disk drives viewed by the operating system as a single logical drive
- Data are distributed across the physical drives of an array in a scheme known as striping
- Redundant disk capacity is used to store parity information, which guarantees data recoverability in case of a disk failure
Redundant Array of Independent Disks
N = number of data disks; m proportional to log N
Table 6.3
RAID Levels
Table 6.4
RAID Comparison (page 1 of 2)
Table 6.4
RAID Comparison (page 2 of 2)
SSD Compared to HDD - SSDs have the following advantages over HDDs:
- High-performance input/output operations per second (IOPS)
- Durability
- Longer lifespan
- Lower power consumption
- Quieter and cooler running capabilities
- Lower access times and latency rates
Table 6.5
Comparison of Solid State Drives and Disk Drives
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