Promise Technology FastTrak SX4000 Lite User Manual download pdf (Page 65)

Appendix A: FAQs

RAID 5 (Block and Parity Striping)

For capacity – The FastTrak RAID 5 array is the smallest drive size

multiplied by the number of drives, less one. The larger HDDs will be

truncated. The truncated space on the bigger HDDs will then be unusable.

For sustained data transfers – The FastTrak RAID 5 array will write data at

moderate speed but will read data very quickly. The fact that you can use 3

or 4 drives and the effect of parity calculations means defining speed in

terms of a single HDD is difficult and imprecise.

JBOD (Just a Bunch of Disks)

Technically, JBOD is not a RAID level but a collection of single disk drives.

The FastTrak S150 SX4 and SX4000 / SX4000 Lite support up to four such

drives.

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Promise Technology FastTrak SX4000 Lite User Manual Page 65