On Wed, Mar 03, 2021 at 10:28:34AM -0500, Marc Auslander wrote: > One potential gotcha. When you boot from an mdadm file system containing > /boot/grub, grub will not write to the file system. In particular, it will > not update grub/grubenv even if you have a save_env line in grub.cfg. So if > you use grub-reboot to specify an alternate line in grub.cfg, you need to > reset grubenv afterwards. I do this in a root @reboot cron job. > > If you don't know what I'm talking about, you probably don't need to worry > about this.
I don't *know* know what you're talking about, but I think I get the gist of it. I'm not doing anything fancy enough to have to deal with the details of grubenv and grub-reboot, but your initial comment about grub refusing to write to a mdadm filesystem is consistent with what I was seeing, and it's nice to have confirmation that it actually does work that way. -- Dave Sherohman