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Nvidia NForce3 Go120, Go150, 150, 250, 250Gb, and 150 Pro (SATA-I); NForce 4 MCP, SLI, Ultra (SATA-II); and NForce Pro 2200 MCP and 2050 (SATA-II) chips — fakeraid. This motherboard chipset family uses yet another type of fakeraid called nvRAID. Beta libata driver "sata_nv" exists as of 2004-07-08 development code, included in kernel 2.6.8. Note: Nvidia's proprietary Linux i386 binary driver
bundles for its chipsets seem to rely on (and in some cases furnish) Garzik's "sata_nv" driver — presumably adding to that Nvidia's own subdriver to support nvRAID disk formatting. However, as usual, you're probably
better off using Linux's own open-source "md" software-RAID driver for the RAID functionality.
Иными словами, не RAID это, а эмуляция. Если хочется RAID'a в линуксе на подобной матери - лучше использовать Software RAID, который есть в ядре. Или пытаться использовать закрытые дрова от nVidia.