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From: Darren Hart <dvhart@linux.intel.com>
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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).

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel