[lug] more RAID0 on /

D. Stimits stimits at comcast.net
Fri Nov 19 20:24:30 MST 2004

Ok, with some hints from people here I've partially solved the dilemma. 
At this point I was able to use rescue mode and install grub on the scsi 
part of the system (review: installed to IDE and trying to swap over to 
SCSI with RAID0 root partition, and normal SCSI /boot/), and get it 
partially working.

At this point it reads the kernel off the /boot/ partition, and gets as 
far as attempting pivot_root, then fails. Now since the kernel has raid0 
compiled in directly, I am guessing that it is failing to raidstart 
/dev/md0. The partitions are marked in fdisk as "Linux raid autodetect" 
though, and if I boot to this same kernel (it is an exact copy) under 
IDE it does automatically detect and start /dev/md0. My question is why 
if this is autostart raid0, how come it works under IDE but not under 
SCSI with root partition on md0? Does autodetect require something that 
must be made available by mounting the root partition, thus defeating 
the ability to raidstart? Or should the kernel with compiled in RAID0 
and autodetect marked partitions detect properly to allow mount of 
/dev/md0 on /? Or perhaps my grub.conf kernel line is incorrect:
    kernel /vmlinuz-2.6.9-2smp ro root=/dev/md0

Unless there is something in init to raidstart autodetect that is itself 
initially stored and loaded from "/", I can't see a reason why this 
would fail. Hints or clues? Do I have to custom build initrd differently 
when root partition is RAID0 in order to raidstart despite autodetect?

D. Stimits, stimits AT comcast DOT net

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