User manual

FastTrak S150 SX4 / SX4000 / SX4000 Lite User Manual
58
Q: How do the FastTrak S150 SX4 and SX4000 / SX4000 Lite RAID
Controllers provide storage and data protection with their arrays?
A: FastTrak S150 SX4 and SX4000 / SX4000 Lite implement five RAID levels
as follows:
RAID 0 (Stripe)
For capacity – The FastTrak RAID 0 array will be as big as the smallest
HDD in the array times however many HDDs are in the array. Any larger
HDDs will simply be truncated. The truncated space on the bigger HDDs
will then be unusable.
For sustained data transfers – Using a FastTrak Controller, a RAID 0 array
consisting of two HDDs will transfer at about twice the speed of the slowest
HDD in the array. A RAID 0 array consisting of four HDDs will transfer at
about three times the speed of the slowest HDD in the array.
RAID 1 (Mirror)
For capacity – The FastTrak RAID 1 array will be as big as the smallest
HDD in the array. The larger HDD will simply be truncated. The truncated
space on the bigger HDD will then be unusable.
For sustained data transfers – The FastTrak RAID 1 array will write data at
the rate of the slowest HDD in the array. The FastTrak array will read data
at twice the rate of the slowest HDD in the array.
RAID 0+1 (Stripe / Mirror)
For capacity – The FastTrak RAID 0+1 array will be one-half the size of the
smallest HDD in the array. The larger HDDs will be truncated. The truncated
space on the bigger HDDs will then be unusable.
For sustained data transfers – The FastTrak RAID 0+1 array consisting of
four HDDs will transfer at about twice the speed of the slowest HDD in the
array.