Jules Bean wrote:
I'm trying to understand the boot sequence of new kernels (2.6.24,
initramfs) better and I really don't understand how the RAID assembly
works.
The docs (md.txt) say that auto-assembly only occurs if the RAID arrays
are marked as 'RAID autodetect' aka partition type 0xfd. On the other
hand mdadm needs mdadm.conf to get going.
Initramfs is a tiny linux. It (usually) either has simple mdassamble or
mdassemble.auto, or full-blown mdadm - and when you use those, partition
type is ignored.
Partitions with 0xfd relate to [deprecated in times of early userpsace]
method of assembling the arrays by the kernel itself, before any
userspace code (initramfs/rd, your system) takes action.
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