On Thu, Dec 22, 2016 at 10:53 AM, jdd
Grub2 boots from GPT just fine, no tricks.
the problem is with BIOS legacy and GPT. In fact the (yast) install don't end, stops on grub error
But I use neither LVM nor RAID on the system.
apparently, if I use GPT, I need a special grub partition (special ID), and this can't be on lvm/raid.
Correct. Or you install grbu2 on partition and "generic code" in MBR (which in this case would be Syslinux GPTMBR). But if the only partition on disk is the one for Linux MD, this is not possible.
If so how can I have a bootable second disk? it needs to be reset for each kernel update.
You (or rather installer) create this special partition on the second disk and install grub2 on it.
with my present config (if it works, I have 3 weeks to test it), I have one 1Tb partition (have to be less than 2Tb) on each disk, assembled as raid 1.
Well ... YaST supports Linux MD RAID1 with 2 disks and should automatically configure bootloader installation on both disks. I am not sure whether it supports any other Linux MD (last time I got a look at the code it did not). It would actually be valid request that does not even require any major redesign - grub2 itself does not care whether Linux MD has 2, 3 or 23 disks, so YaST would just need to call grub-install for each of them.
on this raid, to be able to partition it, I have lvm and 2Gb swap, 50Gb root and the rest as data
That's fine as long as you have enough place to install grub outside of this partition. 1MB for default post-MBR gap or for BIO boot partition should be enough though. Of course if installer does not do it automatically, you can always manually install grub later; and I expect that adding third disk to /etc/default/grub_installdevice should ensure that and future grub update will be installed on all three disks. Not sure how YaST bootloader module will behave though (you tell :) ) -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org