tested again.
Acer laptop Aspire E15 E5-571G EFI system
64GB USB 3.0 flash medium

Loaded F25 Alpha release Workstation
dnf update kernel -> got Kernel x86_64 4.8.0-0 rc8.git.0.1.fc25
made -according to the production process- a successful F25 build on the 64GB flash medium
Tried to boot -> again Dracut error with the warnings:
- dev/fedora/root does not exist
- dev/fedora/swap does not exist
- dev/mapper/fedora-root does not exist

When I looked with F24 onto the F25 build, most partitions did not exist, i.e. EFI partition was empty, also GRUB2 was nearly empty,
the size of the F25 build was was about 1,1GB.
Kind regards

-----Urspr√ľngliche Mitteilung-----
Von: Chris Murphy <lists@colorremedies.com>
An: For testing and quality assurance of Fedora releases <test@lists.fedoraproject.org>
Verschickt: Fr, 30 Sept 2016 8:35 pm
Betreff: Re: Fedora on usb connected media

On Fri, Sep 30, 2016 at 11:07 AM, Richard Ryniker <ryniker@alum.mit.edu> wrote: > Works for me. I used a Samsung 940X laptop and a Sandisk 80GB USB3 > external SSD. > > This is a UEFI machine, and I installed using manual partitioning to > re-use partitions on the external device, which contained an old Fedora > 23 system. My purpose here was to preserve an encrypted /home partition. > /boot, /boot/efi, /root and a swap partition were reformatted by the > installer for the F25 system. > > In order to boot from the external drive, I must use the EFI boot loader > - press F10 during start to display a list of boot devices, then select > the SanDisk USB drive. Just a guess, but I think that when the USB stick isn't present, the firmware is removing what it considers to be a stale NVRAM boot entry. Or it's reordering the boot priority. Otherwise the stick would be booted by default, if present. > The internal drive for this machine dual boots Fedora 24 and Windows. > Only the external drive was used by Anaconda for the F25 installation. > It might be possible to update GRUB on the internal drive so it can boot > F25 from the external drive, but I rather like the present state where no > change was made to the internal storage medium. The boot manager aspects of GRUB are weak, it still depends on static configuration rather than dynamic discovery. Discovery is difficult as os-prober's existence and history shows. There's a proposed standard to help, but there's no meaningful agreement on it among any of the stake holders. But yes, it's possible to statically get a boot entry into GRUB but then it appears as if it's a valid option even when the stick isn't present. If the stick has to be recreated/replaced, then that boot entry won't work. -- Chris Murphy _______________________________________________ test mailing list -- test@lists.fedoraproject.org To unsubscribe send an email to test-leave@lists.fedoraproject.org