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I'm working on setting up a simple RAID and am wondering about how independent my SATA ports really are. There are 4 ports on the motherboard, but lspci shows only two controllers

00:0e.0 IDE interface: NVIDIA Corporation MCP51 Serial ATA Controller (rev a1) (prog-if 85 [Master SecO PriO])
    Subsystem: Micro-Star International Co., Ltd. Device 7350
    Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 21
    I/O ports at b800 [size=8]
    I/O ports at b480 [size=4]
    I/O ports at b400 [size=8]
    I/O ports at b080 [size=4]
    I/O ports at b000 [size=16]
    Memory at fbffd000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: [44] Power Management version 2
    Capabilities: [b0] MSI: Enable- Count=1/4 Maskable- 64bit+
    Capabilities: [cc] HyperTransport: MSI Mapping Enable- Fixed+
    Kernel driver in use: sata_nv

00:0f.0 IDE interface: NVIDIA Corporation MCP51 Serial ATA Controller (rev a1) (prog-if 85 [Master SecO PriO])
    Subsystem: Micro-Star International Co., Ltd. Device 7350
    Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 20
    I/O ports at ac00 [size=8]
    I/O ports at a880 [size=4]
    I/O ports at a800 [size=8]
    I/O ports at a480 [size=4]
    I/O ports at a400 [size=16]
    Memory at fbffc000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: [44] Power Management version 2
    Capabilities: [b0] MSI: Enable- Count=1/4 Maskable- 64bit+
    Capabilities: [cc] HyperTransport: MSI Mapping Enable- Fixed+
    Kernel driver in use: sata_nv

The kernel log at boot shows

ata1: SATA max UDMA/133 cmd 0xb800 ctl 0xb480 bmdma 0xb000 irq 21
ata2: SATA max UDMA/133 cmd 0xb400 ctl 0xb080 bmdma 0xb008 irq 21
ata3: SATA max UDMA/133 cmd 0xac00 ctl 0xa880 bmdma 0xa400 irq 20
ata4: SATA max UDMA/133 cmd 0xa800 ctl 0xa480 bmdma 0xa408 irq 20

Would this mean I have two channels with two ports each? If so, a RAID 1 with two drives should ideally be set up with each drive on a separate channel (although performance may not really be noticeable)? Or is each port still independent?

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