sp26-cs537 cs537
Lecture 23 - RAID Lecture 23 - RAID
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Why Multiple Devices?
Solution 1: JBOD (“Just a Bunch Of Disks”)
Solution 2: RAID
General Strategy: Mapping + Redundancy
Workloads and Metrics
Why Talk About RAID?
RAID-0: Striping
Stripes and Chunk Size
Address Calculation
RAID-0 Analysis
RAID-0 Reliability
RAID-1: Mirroring
RAID-1 Analysis
Crashes (Consistent-Update Problem)
RAID-1 Reliability
RAID-4: Parity Disk
Parity = Sum (or XOR)
RAID-4 Operations
Additive vs Subtractive Parity
RAID-4 Analysis
RAID-5: Rotated Parity
Random Write Layout
RAID-5 Analysis
RAID Level Comparison
Summary
Source