I'm finding GRUB2 will boot from md RAID 0, 1, 4, 5, 6, with /boot in the array, up to six member devices. At device 7, GRUB2 fails to boot the array, drops to a grub rescue prompt saying the mduuid couldn't be found.
With Btrfs single and RAID 0 profiles, /boot on Btrfs is bootable for up to 4 devices. At the 5th device in a volume, it's no longer bootable by GRUB2, I get a grub rescue prompt. I get variable results with RAID 10 for some reason where often it works with 5 and 6 disks. The question is if this is expected, as-designed, and if it's stable? I feel like some subjective (certainly objective limits are OK) limit for number of member devices is acceptable, but needs to be known, so that installers can inhibit or warn users from creating unbootable arrays. And then how to communicate this downstream? Chris Murphy _______________________________________________ Grub-devel mailing list [email protected] https://lists.gnu.org/mailman/listinfo/grub-devel
