RAID level comparison

Basic RAID array

RAID 0 1 5 6
HDD minimum 2 2 3 4
failure protection - n -1 1 2
Performance read high medium medium medium
write high low low low
Degraded read - medium low low
write - medium low low
Capacity utilization 100% ≤ 50% 67 - 94% 50 - 88%

Combined RAID array

RAID 0+1 1+0 5+0 6+0 5+1 6+1
HDD minimum 4 4 6 8 6 8
failure protection 1 1+1 1+1 2+2 1+array 2+array
Performance read medium high high high medium medium
write medium medium medium medium low low
Degraded read medium medium medium medium low low
write medium medium medium medium low low
Capacity utilization 50% 50% 67 - 94% 50 - 88% 33 - 47% 25 - 44%
9 years
245 countries
380k users
2230k calculations
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