Re: boot time autoassembly: how come it works?

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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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