Tested on 14.04.3 daily build.
Things go from this:
~ # df -h /target
Filesystem Size Used Available Use% Mounted on
/dev/mapper/mpath0p2 31.1G 47.9M 29.4G 0% /target
~ # cat /proc/swaps
Filename Type Size Used
Priority
/dev/mapper/mpath0p3 partition 1408448 0
-1
~ # dmsetup table | grep ^mpath0
mpath0: 0 554287104 multipath 1 queue_if_no_path 1 alua 2 1 round-robin
0 1 1 8:0 1000 round-robin 0 1 1 65:144 1000
mpath0p3: 0 2817024 linear 252:0 66468608
mpath0p2: 0 66466560 linear 252:0 2048
mpath0p1: 0 1792 linear 252:0 256
To this:
~ # df -h /target
Filesystem Size Used Available Use% Mounted on
/dev/mapper/mpath0p2 249.4G 59.1M 236.7G 0% /target
~ # cat /proc/swaps
Filename Type Size Used
Priority
/dev/mapper/mpath0p3 partition 11268032
0 -1
~ # dmsetup table | grep ^mpath0
mpath0-part2: 0 531732480 linear 252:0 16384
mpath0-part1: 0 14336 linear 252:0 2048
mpath0: 0 554287104 multipath 1 queue_if_no_path 1 alua 2 1 round-robin
0 1 1 8:0 1000 round-robin 0 1 1 65:144 1000
mpath0p3: 0 22536192 linear 252:0 531748864
mpath0p2: 0 531732480 linear 252:0 16384
mpath0p1: 0 14336 linear 252:0 2048
mpath0-part3: 0 22536192 linear 252:0 531748864
(ignore -part and p separators, this is another bug which should
be backported for as well)
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https://bugs.launchpad.net/bugs/1441930
Title:
Fix handling of multipathed disks with 4k-sectors
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