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Oracle 19c Server
RAID Architecture
RAID Types
Type Description RAID 0 Striped disks RAID 1 Mirrored disks RAID 5 Striped disks with distributed parity RAID 01 Disks are striped first, then the stripes are mirrored RAID 10 Disks are mirrored first, then the mirrors are striped
RAID Type Comparisons
- RAID 0 has no fault tolerance.
- RAID 10 provides a balanced mix of fault tolerance and performance.
- RAID 10 is faster and more fault-tolerant than RAID 5.
- RAID 10 is more fault-tolerant than RAID 01.
RAID Recommendations
Use RAID 10. Do not use RAID 5 or RAID 01.- If RAID 10 is unavailable, it can be simulated by combining RAID 1 (mirroring) with LVM striping.
- The stripe width is the number of disks in the disk array. Choose the stripe width accordingly to maximize performance. Make sure there are enough disk devices in the disk array to support the total I/Os per second required, not just the number of GB to be stored.
- The stripe size (also referred to as stripe granularity or chunk size) is the number of bytes in the stripes written to each disk. Generally set the stripe size to 64K.
- When RAID is implemented on internal hard drives, use Software RAID instead of Hardware RAID.
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