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A multipath device is detected because there is a
/sys/dev/block/M:m/dm/uuid file with the mpath- prefix (or part\w+-mpath
prefix).
When ceph-disk prepares data or journal devices on a multipath device,
it sets the partition typecode to MPATH_JOURNAL_UUID, MPATH_OSD_UUID and
MPATH_TOBE_UUID to
a) help the udev rules distinguish them from other devices in
devicemapper
b) allow ceph-disk to fail if an attempt is made to activate a device
with this type without accessing it via a multipath device
The 95-ceph-osd.rules call ceph-disk activate on partitions of type
MPATH_JOURNAL_UUID, MPATH_OSD_UUID. It relies on ceph-disk to do nothing
if the device is not accessed via multipath.
http://tracker.ceph.com/issues/11881 Fixes: #11881
Signed-off-by: Loic Dachary <ldachary@redhat.com>
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| .. | ||
| 50-rbd.rules | ||
| 60-ceph-partuuid-workaround.rules | ||
| 95-ceph-osd-alt.rules | ||
| 95-ceph-osd.rules | ||
| 95-ceph-osd.rules.systemd | ||