Linux software RAID: RAID 5 vs RAID 10 performance and other RAID levels

Written by Gionatan Danti on . Posted in Linux & Unix

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Array size comparison

The first thing to remember is that the various array setup end up in creating different sized virtual disks. The table below summarize the array size and the space efficiency (please remember that 1 TB disk is equivalent to 931.5 GiB – some space is lost from the conversion from 10^3 to 2^10 notation)

 

NO RAID

RAID 0

RAID 1

RAID 5

RAID 10

Total partition size (GiB)

861.2

 

3444.8

 

3444.8

 

3444.8

 

3444.8

 

Total array size (GiB)

861.2

 

3444.78

 

861.2

 

2583.59

 

1722.39

 

Space efficiency (%)

100.00%

99.99%

 

25.00%

 

75.00%

 

50.00%

 

Please note that, while RAID 0, 1 and 10 have a fixed efficiency value, in RAID 5 this value depend on the number of disks in the array. For example, in a 8 disks array, the efficiency value of RAID 5 raise to 87.5%, while in a 16 disks array that value is 93.75%.

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