I have successfully created a kvm based reproducer.
1) get an image
$ wget
https://cdimage.ubuntu.com/ubuntu-server/daily-live/pending/noble-live-server-amd64.iso
2) Create bcache disk
$ fallocate -l 20G image.img
$ make-bcache -C image.img
3) Boot into iso with multipathed bcache disk
$ kvm -m 2048 -boot d -cdrom ./noble-live-server-amd64.iso -device
virtio-scsi-pci,id=scsi -drive
file=image.img,if=none,id=sda,format=raw,file.locking=off -device
scsi-hd,drive=sda,serial=0001 -drive
if=none,id=sdb,file=image.img,format=raw,file.locking=off -device
scsi-hd,drive=sdb,serial=0001
Select "Try or install Ubuntu" wait for the OS to load. Press F2 to
escape to a shell to check multipathed devices.
You will see exactly what this bug describes - /dev/sd{a,b} is present
with no multipathing.
Redo these steps without make-bcache on image.img and you will see a
proper multipath /dev/mapper/mpatha present.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1887558
Title:
Multipath JBOD storage devices are not shown via /dev/mapper but each
path as a single device.
To manage notifications about this bug go to:
https://bugs.launchpad.net/bcache-tools/+bug/1887558/+subscriptions
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