RAID 10: Very High Reliability combined with High Performance
Characteristics/Advantages
1. RAID 10 is implemented as a striped array whose segments are RAID 1 arrays
2. RAID 10 has the same fault tolerance as RAID level 1
3. RAID 10 has the same overhead for fault-tolerance as mirroring alone
4. High I/O rates are achieved by striping RAID 1 segments
5. Under certain circum...
RAID 7: Optimized Asynchrony for High I/O Rates as well as High Data Transfer Rates
Architectural Features:
1. All I/O transfers are asynchronous, independently controlled and cached including host interface transfers
2. All reads and write are centrally cached via the high speed x-bus
3. Dedicated parity drive can be on any channel
4. Fully implemented process oriented real...
RAID 6: Independent Data disks with two independent distributed parity schemes
Characteristics/Advantages
1. RAID 6 is essentially an extension of RAID level 5 which allows for additional fault tolerance by using a second independent distributed parity scheme (two-dimensional parity)
2. Data is striped on a block level across a set of drives, just like in RAID 5, and a secon...
RAID 5: Independent Data disks with distributed parity blocks
Characteristics/Advantages
1. Highest Read data transaction rate
2. Medium Write data transaction rate
3. Low ratio of ECC (Parity) disks to data disks means high efficiency
4. Good aggregate transfer rate
Disadvantages
1. Disk failure has a medium impact on throughput
2. Most complex controller design
3. Difficul...
RAID 4: Independent Data disks with shared Parity disk
Characteristics/Advantages
1. Very high Read data transaction rate
2. Low ratio of ECC (Parity) disks to data disks means high efficiency
3. High aggregate Read transfer rate
Disadvantages
1. Quite complex controller design
2. Worst Write transaction rate and Write aggregate transfer rate
3. Difficult and inefficient dat...
RAID 3: Parallel transfer with parity
Characteristics/Advantages
1. Very high Read data transfer rate
2. Very high Write data transfer rate
3. Disk failure has an insignificant impact on throughput
4. Low ratio of ECC (Parity) disks to data disks means high efficiency
Disadvantages
1. Transaction rate equal to that of a single disk drive at best (if spindles are synchronized...