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Verified on device-mapper-persistent-data-0.2.8-2.el7: # modprobe scsi_debug dev_size_mb=256 lbpu=1 lbpws10=1 # pvcreate /dev/sdn # vgcreate vg /dev/sdn # lvcreate -T -L20 -V10 -n LV1 vg/pool # lvcreate -T -V10 -n LV2 vg/pool # mkfs.ext2 /dev/vg/LV1 # mkfs.ext2 /dev/vg/LV2 # lvs -a vg LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert LV1 vg Vwi-a-tz-- 12.00m pool 5.21 LV2 vg Vwi-a-tz-- 12.00m pool 5.21 [lvol0_pmspare] vg ewi------- 4.00m pool vg twi-a-tz-- 20.00m 6.25 [pool_tdata] vg Twi-ao---- 20.00m [pool_tmeta] vg ewi-ao---- 4.00m # lvchange -an vg/LV1 # lvchange -an vg/LV2 # lvchange -an vg/pool # lvs -a vg swap and dump metadata: # lvcreate -n meta -L 8M vg # lvconvert --poolmetadata vg/meta --thinpool vg/pool # lvchange -ay vg/meta # thin_dump /dev/vg/meta >meta # cat meta <superblock uuid="" time="0" transaction="2" data_block_size="128" nr_data_blocks="320"> <device dev_id="1" mapped_blocks="10" transaction="0" creation_time="0" snap_time="0"> <range_mapping origin_begin="0" data_begin="0" length="5" time="0"/> <range_mapping origin_begin="128" data_begin="5" length="4" time="0"/> <single_mapping origin_block="191" data_block="9" time="0"/> </device> <device dev_id="2" mapped_blocks="10" transaction="1" creation_time="0" snap_time="0"> <range_mapping origin_begin="0" data_begin="10" length="5" time="0"/> <range_mapping origin_begin="128" data_begin="15" length="4" time="0"/> <single_mapping origin_block="191" data_block="19" time="0"/> </device> </superblock> Single byte corruption in metadata: # dd if=/dev/zero of=/dev/vg/meta bs=1 seek=40960 count=1 # thin_check /dev/vg/meta examining superblock examining devices tree examining mapping tree missing all mappings for devices: [3, -] bad checksum in btree node thin device 2 is missing mappings [3, 0] [root@sun-x2270m2-01 ~]# echo $? 1 note: fixed version gives the correct 'failing' exit code now. # thin_dump /dev/vg/meta >meta2 metadata contains errors (run thin_check for details). perhaps you wanted to run with --repair repair metedata now: # lvcreate -n fix -L 8M vg # thin_repair -i /dev/vg/meta -o /dev/vg/fix # echo $? 0 # thin_check /dev/vg/fix examining superblock examining devices tree examining mapping tree
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