January 31, 200818 yr I'm slightly confused. At first my friend and I thought it was just a frontend to LVM/MD. However, it looks like it uses MD, but not like a typical RAID setup. In the UI, you have to reference a specific disk for parity. This opens up a few questions like what if the parity disk is smaller than (N-1) disks? i.e. if the parity drive was 500G and the other disks were all 750's? Does it still use MD as a software raid? I clicked "format" and it appears like all the disks are treated individually. Is there some sort of proprietary layer that makes sure parity blocks are stored for everything? (FYI I would love it if XFS was used instead of reiser. I suppose I could try to hack that myself somewhere. I definately want to learn more!)
January 31, 200818 yr mike - there's lots of documentation on our website as well as on the forums that talk about this. What we did was take write our own 'unraid' driver and integrated it with modified 'md' subsystem as it existed on the 2.4 kernel. So essentially unraid 'replaces' the linux md subsystem.
January 31, 200818 yr Author got it. i found a post on avsforum where someone gave some in-depth info. unraid is a pretty neat idea. i couldn't boot off my flash drive on my little mini-itx VIA system, so i copied things on top of an existing linux install and added it manually to grub. it actually boots, and just needed the flash drive mounted as /boot after it booted up unraid. i'm just messing around right now.
February 19, 200818 yr Occam's Razor: The simplest answer is usually the right one. Therefore, unRAID probably works by magic.
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