Paul wrote:
The Linux kernel does not now support any of the motherboard chips capable of native RAID mode in the BIOS.
Not true. Read http://linux.yyz.us/sata/faq-sata-raid.html.
Perhaps you missed the subject matter. The question is why the ABIT AV8 RAID mode in the BIOS does not work with Linux. The drivers in the kernel don't control whether the BIOS has RAID mode enabled or not; that is in the BIOS. Nor was the original question about raid programs instead of chips.
The ABIT AV8 and my ASUS A8V both have the VIA8237 chip. The
problem with the VIA8237 is the same as all the rest: the chips are not supported by the kernel in RAID mode. There
are probably people someplace hacking around the kernel
drivers and maybe they will get things working someday.
All disk controllers built into AMD64 motherboards, if they have RAID capability, are only supported if RAID mode for the chips is not enabled. Do NOT enable the RAID mode for the chips in the BIOS or they won't work using the drivers in the kernel because the drivers were not written to use the controllers properly if RAID mode was enabled.
Most (maybe all?) of the proprietary raid formats are supported by the dmraid driver.
Maybe the DiskMapper code is the exception except the chips are no good anyway. Does anybody use the DiskMapper?
Generally speaking RAID0 doubles throughput for large writes as data is striped across both volumes, and has seek times the same as a single drive.
Not for chips on any AMD64 motherboard. This is not about theory, this is about certain chips and how they work and they don't work good enough to use their RAID capability.
Read this and weep: http://techreport.com/reviews/2004q2/chipset-raid/index.x?pg=28
Paul, what motherboard do you have? How do your disk controller chips perform?
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