Hi Gábor, Gábor Boskovits skribis: >> + mdadm --create /dev/md0 --verbose --level=stripe --raid-devices=2 >> /dev/vdb2 /dev/vdb3 >> mdadm: chunk size defaults to 512K >> mdadm: Defaulting to version 1.2 metadata >> [ 13.890586] md/raid0:md0: cannot assemble multi-zone RAID0 with >> default_layout setting >> [ 13.894691] md/raid0: please set raid0.default_layout to 1 or 2 >> [ 13.896000] md: pers->run() failed ... >> mdadm: RUN_ARRAY failed: Unknown error 524 >> [ 13.901603] md: md0 stopped. >> --8<---------------cut here---------------end--------------->8--- >> >> Anyone knows what it takes to “set raid0.default_layout to 1 or 2”? >> > > On kernel 5.3.4 and above the > raid0.default_layout=2 kernel boot paramter should be set. We should > generate our grub configuration accordingly. That’s part of the solution, thank you! With the patch below, the “raid-root-os” test successfully installs the system to a RAID0 device, but then that system fails to boot with: --8<---------------cut here---------------start------------->8--- Booting from Hard Disk... GRUB loading. Welcome to GRUB! error: invalid arch-independent ELF magic. Entering rescue mode... --8<---------------cut here---------------end--------------->8--- (It sits there forever.) Are we missing something in ‘grub.cfg’? If so, I wonder if that problem arose with the upgrade in commit 069ab3bbfde704760acaca20dff8a29d167c6be5. Thoughts? Ludo’.