OK, after more searching the 'net I have found the answer. It seems
RAID0 was unintentionally broken since kernel 5.3.1, but there is a
workaround
On 19/10/2019 08:42, Christopher Ross wrote:
There have been two kernel updates this past week:
kernel-core-5.3.5-200.fc30.x86_64
kernel-core-5.3.6-200.fc30.x86_64
Neither of these will boot for me. I get so far as the Fedora splash
screen in graphics mode but never the login screen.
Oct 19 07:24:38 snoopy.tebibyte.org systemd[1]: local-fs.target:
Triggering OnFailure= dependencies.
Oct 19 07:24:38 snoopy.tebibyte.org systemd[1]: local-fs.target: Job
local-fs.target/start failed with result 'dependency'.
Oct 19 07:24:38 snoopy.tebibyte.org systemd[1]: Dependency failed for
Local File Systems.
...
Under the last kernel that does boot
(kernel-core-5.2.18-200.fc30.x86_64), the device it is references
looks like this :
lrwxrwxrwx. 1 root root 9 Oct 19 07:30
"/dev/disk/by-uuid/a1aaca46-f02d-4407-90ab-1067eecea53d" -> "../../md0"
Where md0 is a RAID0 of 4 x 1TiB discs.
Thanks to a not dissimilar query on the ArchLinux lists:
(https://bbs.archlinux.org/viewtopic.php?pid=1868823#p1868823)
It's a bug, recently discovered, that caused the raid0 layout to
change unintentionally a while back, so now they're in a pickle...
they have two layouts and the metadata doesn't say which is correct.
If they fix the unintentional change, they corrupt all raid0 using the
unintended new layout; if they don't fix it, they corrupt all raid0
using the old layout. Both choices are wrong so they decided instead
to make it "stop working entirely" until the sysadmin decides how they
want to corrupt their raid0.
so you have to add a kernel paramter: raid0.default_layout=1 for new
or =2 for old 3.x kernel raid0s
Regards,
Chris R.
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