On 01/18/2012 09:05 AM, Jim Abernathy wrote:

FYI for those wanting to use Soft RAID, make sure you create one very 
small primary partition for GRUB2 to put the second part of the 
boot-loader in.  Can't use the old process.

I strongly recommend using a separate DISK for your OS installation.
Yocto builds are hard on disks, and RAID 0 increases your risk of
failure in exchange for the added performance. I use a small SSD for my
OS disk and a large RAID0 array of spinning disks for /build and another
array for /virt (where my VM images live - easily recreated).

1. So we know that at least with Edison, btrfs does not work with bitbake.
2. When I rebuilt the system, this time I put the Linux root directory on an 80GB SSD.  That is where I also have my clone of Linux-Yocto repository, poky, and download directory , DL_DIR.
3. I have create /build with EXT4 format on a Software RAID 0 (striped) partition, using 2 separate hard drives,  to use as the working build directory for bitbake. I have a striped swap file on the same two drives.  But with 8GB or RAM, I shouldn't be using that much.