Promise Technology 150TX2 - Manual (Page 72)

FastTrak S150 TX2plus User Manual
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Q: How does the FastTrak S150 TX2plus RAID controller provide storage
and/or data protection with their arrays?
A: FastTrak S150 TX2plus implements three different types of RAID levels as
follows:
RAID 0 (Stripe)
For capacity – The FastTrak S150 TX2plus 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 FastTrak S150 TX2plus, 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 S150 TX2plus 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 S150 TX2plus array will write data
at the rate of the slowest HDD in the array. The FastTrak S150 TX2plus array
will read data at twice the rate of the slowest HDD in the array.
RAID 0+1 (Stripe + Mirror)
For capacity – The FastTrak S150 TX2plus array will be twice as big as the
smallest HDD in the array. The larger HDD will be truncated. The truncated
space on the larger HDD will then be unusable.
For sustained data transfers – The FastTrak S150 TX2plus array will write data
at twice the rate of the slowest HDD in the array. The FastTrak S150 TX2plus
array will read data at twice the rate of the slowest HDD in the array.