On Mon, May 6, 2019 at 3:15 PM Steven A. Falco <stevenfalco@xxxxxxxxx> wrote: > > As I was reading through the documentation, I came across a statement that grubenv is unavailable on RAID - please see the second to last sentence here: > > https://www.gnu.org/software/grub/manual/grub/html_node/Environment-block.html > > My machine is set up with /boot on SW RAID-1 (and everything else on SW RAID-5 / LVM). That said, grubenv appears to update properly. I don't know if the manual is not quite current, or if there is some other explanation - perhaps any updates always occur under Linux, while the RAID-1 is assembled. > > Regardless, everything is good now, so I'll stop obsessing about it. :-) Yep. https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx/message/PBCAGLM46RSG54QW3DM43U4H5YQSHZNB/ GRUB pre-boot environment can read grubenv from anything GRUB supports reading, which is practically anything including mdadm RAID. Your grubenv can be read, it just can be changed by GRUB in the pre-boot environment. That means it can't change boot_success to 0. It'll always be a 1, meaning GRUB will think your boots are always successful. When a new kernel is installed, the package scripts cause grubenv saved_entry to get updated. This is happening through kernel file system and md code, so it's a completely supported change, and that's how GRUB in the pre-boot environment can see the updated saved_entry and know which kernel version to boot by default. But it's worth keeping an eye on anomalies. There is the potential for goofy things happening. Unrelated to this particular feature, rather it was grub.cfg being updated, in cases where that update happened very quickly followed by an immediate reboot, GRUB only saw the previous grub.cfg. On journaled file systems, the new file gets written out, and indicated only in the journal, and a particular set of circumstances preventing the root fs from being cleanly unmounted resulted in a hidden new grub.cfg that only became revealed after journal replay by the kernel code. The GRUB code can't read file system journals, so it was seeing the stale file as a result of reading stale file system metadata without the benefit of reading the journal. :P -- Chris Murphy _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
