With the uuids staying the same, that implies that the meta volumes aren't actually properly being swapped.


# RHEL 9.3 
kernel-5.14.0-362.8.1.el9_3    BUILT: Tue Oct  3 02:39:10 PM CEST 2023
lvm2-2.03.21-3.el9    BUILT: Thu Jul 13 08:50:26 PM CEST 2023
lvm2-libs-2.03.21-3.el9    BUILT: Thu Jul 13 08:50:26 PM CEST 2023
 
 
SCENARIO - [swap_inactive_thin_pool_meta_device_w_new_vol]
Swap _tmeta device with newly created volume while pool is inactive
Making pool volume
lvcreate --yes  --thinpool POOL -L 1G  --zero n --poolmetadatasize 4M snapper_thinp
 
Sanity checking pool device (POOL) metadata
lvcreate --yes  -L 4M -n meta_swap.716 snapper_thinp
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.716
thin_check /dev/mapper/snapper_thinp-meta_swap.716
Checking thin metadata
device details tree
mapping tree
data space map
metadata space map
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.716
lvremove -f snapper_thinp/meta_swap.716
 
Making origin volume
lvcreate --yes  --virtualsize 1G -T snapper_thinp/POOL -n origin
  WARNING: Sum of all thin volume sizes (6.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (1.00 GiB).
Making snapshot of origin volume
lvcreate --yes  -k n -s /dev/snapper_thinp/origin -n snap
Create new device to swap in as the new _tmeta device
lvcreate --yes  -n newtmeta -L 8M snapper_thinp
  WARNING: Sum of all thin volume sizes (7.00 GiB) exceeds the size of thin pools (1.00 GiB).
 
Dumping current pool (POOL) metadata to /tmp/snapper_thinp_dump.2697.748670
lvchange -an --yes --select 'lv_name=POOL || pool_lv=POOL'
lvcreate --yes  -L 4M -n meta_swap.822 snapper_thinp
  WARNING: Sum of all thin volume sizes (7.00 GiB) exceeds the size of thin pools (1.00 GiB).
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.822lvchange -ay snapper_thinp/meta_swap.822
'thin_dump /dev/mapper/snapper_thinp-meta_swap.822 > /tmp/snapper_thinp_dump.2697.748670'
lvchange -an snapper_thinp/meta_swap.822
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.822
lvremove snapper_thinp/meta_swap.822
lvchange -ay --yes --select 'lv_name=POOL || pool_lv=POOL'
 
Current tmeta device uuid: Wf68rR-Umyh-TlHH-r0PJ-flMQ-ETVq-6yUnbf
Restoring valid mda to new device
thin_restore -i /tmp/snapper_thinp_dump.2697.748670 -o /dev/snapper_thinp/newtmeta
thin_check /dev/snapper_thinp/newtmeta
Checking thin metadata
device details tree
mapping tree
data space map
metadata space map
Corrupting pool meta device (/dev/mapper/snapper_thinp-POOL_tmeta) with zeros
dd if=/dev/zero of=/dev/mapper/snapper_thinp-POOL_tmeta bs=1M count=4
4+0 records in
4+0 records out
4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.00432214 s, 970 MB/s
Swap in new _tmeta device
lvconvert --yes --poolmetadata snapper_thinp/newtmeta --thinpool snapper_thinp/POOL
 
PASS : before: Wf68rR-Umyh-TlHH-r0PJ-flMQ-ETVq-6yUnbf, after: QEKNXj-02LM-nhnT-nn40-X9uE-t9MX-UT4OGo
New swapped tmeta device uuid: QEKNXj-02LM-nhnT-nn40-X9uE-t9MX-UT4OGo
 
Sanity checking pool device (POOL) metadata
lvcreate --yes  -L 4M -n meta_swap.913 snapper_thinp
  WARNING: Sum of all thin volume sizes (7.00 GiB) exceeds the size of thin pools (1.00 GiB).
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.913
thin_check /dev/mapper/snapper_thinp-meta_swap.913
Checking thin metadata
device details tree
mapping tree
data space map
metadata space map
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.913
lvremove -f snapper_thinp/meta_swap.913
 
lvremove -f snapper_thinp/newtmeta
Removing snap volume snapper_thinp/snap
lvremove -f /dev/snapper_thinp/snap
Removing thin origin and other virtual thin volumes
Removing pool snapper_thinp/POOL



# RHEL 9.4 
kernel-5.14.0-362.8.1.el9_3    BUILT: Tue Oct  3 02:39:10 PM CEST 2023
lvm2-2.03.23-1.el9    BUILT: Tue Nov 28 02:15:42 PM CET 2023
lvm2-libs-2.03.23-1.el9    BUILT: Tue Nov 28 02:15:42 PM CET 2023
 
 
SCENARIO - [swap_inactive_thin_pool_meta_device_w_new_vol]
Swap _tmeta device with newly created volume while pool is inactive
Making pool volume
lvcreate --yes  --thinpool POOL -L 1G --profile thin-performance --zero n --poolmetadatasize 4M snapper_thinp
 
Sanity checking pool device (POOL) metadata
lvcreate --yes  -L 4M -n meta_swap.589 snapper_thinp
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.589
thin_check /dev/mapper/snapper_thinp-meta_swap.589
Checking thin metadata
device details tree
mapping tree
data space map
metadata space map
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.589
lvremove -f snapper_thinp/meta_swap.589
 
Making origin volume
lvcreate --yes  --virtualsize 1G -T snapper_thinp/POOL -n origin
Making snapshot of origin volume
lvcreate --yes  -k n -s /dev/snapper_thinp/origin -n snap
Create new device to swap in as the new _tmeta device
lvcreate --yes  -n newtmeta -L 8M snapper_thinp
 
Dumping current pool (POOL) metadata to /tmp/snapper_thinp_dump.3899.743450
lvchange -an --yes --select 'lv_name=POOL || pool_lv=POOL'
lvcreate --yes  -L 4M -n meta_swap.825 snapper_thinp
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.825lvchange -ay snapper_thinp/meta_swap.825
'thin_dump /dev/mapper/snapper_thinp-meta_swap.825 > /tmp/snapper_thinp_dump.3899.743450'
lvchange -an snapper_thinp/meta_swap.825
lvconvert --yes --thinpool snapper_thinp/POOL --poolmetadata snapper_thinp/meta_swap.825
lvremove snapper_thinp/meta_swap.825
lvchange -ay --yes --select 'lv_name=POOL || pool_lv=POOL'
 
Current tmeta device uuid: Tg9bFb-zrTQ-iukU-vgpA-CZsx-W2hn-63nGoE
Restoring valid mda to new device
thin_restore -i /tmp/snapper_thinp_dump.3899.743450 -o /dev/snapper_thinp/newtmeta
thin_check /dev/snapper_thinp/newtmeta
Checking thin metadata
device details tree
mapping tree
data space map
metadata space map
Corrupting pool meta device (/dev/mapper/snapper_thinp-POOL_tmeta) with zeros
dd if=/dev/zero of=/dev/mapper/snapper_thinp-POOL_tmeta bs=1M count=4
4+0 records in
4+0 records out
4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.00278693 s, 1.5 GB/s
Swap in new _tmeta device
lvconvert --yes --poolmetadata snapper_thinp/newtmeta --thinpool snapper_thinp/POOL
New swapped tmeta device uuid: Tg9bFb-zrTQ-iukU-vgpA-CZsx-W2hn-63nGoE
 
FAIL: tmeta was not properly swapped
before: Tg9bFb-zrTQ-iukU-vgpA-CZsx-W2hn-63nGoE, after: Tg9bFb-zrTQ-iukU-vgpA-CZsx-W2hn-63nGoE