The raw-disk-with-object, osd-with-metadata-device, and pvc canary jobs
used loopback devices to supply an extra block device beyond the single
spare disk a GitHub runner provides. Loop devices behave differently
from real block devices -- Rook gates them behind
ROOK_CEPH_ALLOW_LOOP_DEVICES and special-cases them in the OSD daemon --
so exercising core scenarios on them is less realistic than using real
SCSI disks.
Provision the extra device(s) over iSCSI (LIO) instead, reusing the
existing create_extra_disk helper: it now creates N LUNs, the new
find_extra_block_devs and find_second_block_dev helpers enumerate them,
and deploy_cluster gains a two_raw_disks mode. The three jobs now run
entirely on real disks, and the canary CI no longer creates loop devices
or relies on the loop-device test helpers.
Signed-off-by: Joshua Hoblitt <josh@hoblitt.com>
