# pvdisplay -m --- Physical volume --- PV Name /dev/sdb3 VG Name vg_root PV Size 30.00 GiB / not usable 16.00 MiB Allocatable yes (but full) PE Size 2.00 MiB Total PE 15352 Free PE 0 Allocated PE 15352 PV UUID V7pxrc-DVOs-qSAc-6hLN-XLJj-7h6F-OIYuyB --- Physical Segments --- Physical extent 0 to 15: Logical volume /dev/vg_root/lvol0_pmspare Logical extents 0 to 15 Physical extent 16 to 15335: Logical volume /dev/vg_root/lv_thinpool_tdata Logical extents 0 to 15319 Physical extent 15336 to 15351: Logical volume /dev/vg_root/lv_thinpool_tmeta Logical extents 0 to 15 # lvdisplay -m --- Logical volume --- LV Name lv_thinpool VG Name vg_root LV UUID pE6ixk-M82p-WBvb-PNtU-OXMl-mHHW-HN1tNG LV Write Access read/write LV Creation host, time vm_kvmtest, 2016-12-20 15:12:41 +0100 LV Pool metadata lv_thinpool_tmeta LV Pool data lv_thinpool_tdata LV Status available # open 3 LV Size 29.92 GiB Allocated pool data 49.36% Allocated metadata 1.60% Current LE 15320 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:2 --- Segments --- Logical extents 0 to 15319: Type thin-pool Monitoring monitored Chunk size 1.00 MiB Discards passdown Thin count 2 Transaction ID 2 Zero new blocks yes --- Logical volume --- LV Path /dev/vg_root/lv_root2 LV Name lv_root2 VG Name vg_root LV UUID 7qf7bi-WojP-p1of-YNPP-FUwj-neXH-6QujOR LV Write Access read/write LV Creation host, time vm_kvmtest, 2016-12-20 15:12:56 +0100 LV Pool name lv_thinpool LV Status available # open 0 LV Size 25.00 GiB Mapped size 0.00% Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:4 --- Segments --- Virtual extents 0 to 12799: Type thin Device ID 1 --- Logical volume --- LV Path /dev/vg_root/lv_var2 LV Name lv_var2 VG Name vg_root LV UUID SHbsjl-gmFf-3mot-eN6l-jScB-Z0yX-AUNXes LV Write Access read/write LV Creation host, time vm_kvmtest, 2016-12-20 15:13:00 +0100 LV Pool name lv_thinpool LV Status available # open 1 LV Size 15.00 GiB Mapped size 98.47% Current LE 7680 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:5 --- Segments --- Virtual extents 0 to 7679: Type thin Device ID 2 # thin_dump -r -f human_readable /dev/mapper/vg_root-lv_thinpool_tmeta begin superblock: "", 0, 2, 2048, 30640 device: 1 mapped_blocks: 0 transaction: 0 creation time: 0 snap time: 0 device: 2 mapped_blocks: 15125 transaction: 1 creation time: 0 snap time: 0 (0..85) -> (0..85), 0 86 -> 5111, 0 (87..104) -> (87..104), 0 (105..120) -> (5025..5040), 0 (121..127) -> (5055..5061), 0 (128..130) -> (128..130), 0 131 -> 5109, 0 (132..840) -> (132..840), 0 841 -> 5081, 0 842 -> 842, 0 843 -> 5106, 0 844 -> 844, 0 845 -> 5114, 0 846 -> 846, 0 847 -> 5080, 0 (848..851) -> (848..851), 0 852 -> 5110, 0 (853..871) -> (853..871), 0 872 -> 5115, 0 (873..1056) -> (873..1056), 0 1057 -> 5100, 0 1058 -> 1058, 0 1059 -> 5102, 0 1060 -> 1060, 0 1061 -> 5082, 0 (1062..1064) -> (1062..1064), 0 (1065..1071) -> (5041..5047), 0 (1072..1074) -> (1072..1074), 0 1075 -> 5103, 0 (1076..1078) -> (1076..1078), 0 (1079..1080) -> (5062..5063), 0 (1081..1082) -> (1081..1082), 0 (1083..1084) -> (5068..5069), 0 (1085..1086) -> (1085..1086), 0 1087 -> 5091, 0 (1088..1102) -> (1088..1102), 0 (1103..1104) -> (5075..5076), 0 (1105..1106) -> (1105..1106), 0 1107 -> 5092, 0 1108 -> 1108, 0 1109 -> 5107, 0 1110 -> 1110, 0 1111 -> 5112, 0 (1112..1114) -> (1112..1114), 0 1115 -> 5116, 0 (1116..1120) -> (1116..1120), 0 1121 -> 5117, 0 1122 -> 1122, 0 1123 -> 5108, 0 1124 -> 1124, 0 1125 -> 5118, 0 1126 -> 1126, 0 1127 -> 5096, 0 1128 -> 1128, 0 1129 -> 5101, 0 1130 -> 1130, 0 1131 -> 5097, 0 1132 -> 1132, 0 1133 -> 5093, 0 1134 -> 1134, 0 1135 -> 5099, 0 1136 -> 1136, 0 1137 -> 5113, 0 1138 -> 1138, 0 1139 -> 5098, 0 (1140..1144) -> (1140..1144), 0 1145 -> 5119, 0 1146 -> 1146, 0 1147 -> 5104, 0 1148 -> 1148, 0 1149 -> 5094, 0 1150 -> 1150, 0 1151 -> 5095, 0 (1152..1153) -> (1152..1153), 0 1154 -> 5105, 0 (1155..1173) -> (1155..1173), 0 (1174..1175) -> (5089..5090), 0 (1176..1181) -> (1176..1181), 0 1182 -> 5077, 0 (1183..1184) -> (1183..1184), 0 (1185..1191) -> (5048..5054), 0 1192 -> 86, 0 (1193..1199) -> (105..111), 0 (1200..1202) -> (1200..1202), 0 (1203..1207) -> (5084..5088), 0 (1208..1215) -> (1208..1215), 0 (1216..1231) -> (112..127), 0 1232 -> 131, 0 1233 -> 841, 0 1234 -> 843, 0 1235 -> 845, 0 1236 -> 847, 0 1237 -> 852, 0 1238 -> 872, 0 1239 -> 1057, 0 1240 -> 1059, 0 1241 -> 1061, 0 (1242..1248) -> (1065..1071), 0 1249 -> 1075, 0 (1250..1251) -> (1079..1080), 0 (1252..1253) -> (1083..1084), 0 1254 -> 1087, 0 (1255..1256) -> (1103..1104), 0 1257 -> 1107, 0 1258 -> 1109, 0 1259 -> 1111, 0 1260 -> 1115, 0 1261 -> 1121, 0 1262 -> 1123, 0 1263 -> 1125, 0 1264 -> 1127, 0 1265 -> 1129, 0 1266 -> 1131, 0 1267 -> 1133, 0 1268 -> 1135, 0 1269 -> 1137, 0 1270 -> 1139, 0 1271 -> 1145, 0 1272 -> 1147, 0 1273 -> 1149, 0 1274 -> 1151, 0 1275 -> 1154, 0 (1276..1277) -> (1174..1175), 0 1278 -> 1182, 0 1279 -> 1185, 0 (1280..1295) -> (1280..1295), 0 (1296..1309) -> (1186..1199), 0 (1310..1314) -> (1203..1207), 0 (1315..1378) -> (1216..1279), 0 (1379..2431) -> (1296..2348), 0 (2432..2559) -> (2432..2559), 0 (2560..2642) -> (2349..2431), 0 (2643..3199) -> (2560..3116), 0 (3200..3201) -> (3200..3201), 0 (3202..3205) -> (5064..5067), 0 (3206..3207) -> (5078..5079), 0 (3208..3290) -> (3117..3199), 0 (3291..3455) -> (3202..3366), 0 (3456..3457) -> (3456..3457), 0 (3458..3462) -> (5070..5074), 0 3463 -> 5083, 0 (3464..3552) -> (3367..3455), 0 (3553..5119) -> (3458..5024), 0 5120 -> 5124, 0 (5288..6271) -> (5125..6108), 0 (6272..6273) -> (5120..5121), 0 (6280..10367) -> (6109..10196), 0 (10368..10369) -> (5122..5123), 0 (10376..15303) -> (10197..15124), 0 end superblock #vgchange -s 4m vg_root Volume group "vg_root" successfully changed # pvdisplay -m --- Physical volume --- PV Name /dev/sdb3 VG Name vg_root PV Size 30.00 GiB / not usable 16.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 7676 Free PE 0 Allocated PE 7676 PV UUID V7pxrc-DVOs-qSAc-6hLN-XLJj-7h6F-OIYuyB --- Physical Segments --- Physical extent 0 to 7: Logical volume /dev/vg_root/lvol0_pmspare Logical extents 0 to 7 Physical extent 8 to 7667: Logical volume /dev/vg_root/lv_thinpool_tdata Logical extents 0 to 7659 Physical extent 7668 to 7675: Logical volume /dev/vg_root/lv_thinpool_tmeta Logical extents 0 to 7 # lvdisplay -m --- Logical volume --- LV Name lv_thinpool VG Name vg_root LV UUID pE6ixk-M82p-WBvb-PNtU-OXMl-mHHW-HN1tNG LV Write Access read/write LV Creation host, time vm_kvmtest, 2016-12-20 15:12:41 +0100 LV Pool metadata lv_thinpool_tmeta LV Pool data lv_thinpool_tdata LV Status available # open 3 LV Size 29.92 GiB Allocated pool data 49.36% Allocated metadata 1.60% Current LE 7660 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:2 --- Segments --- Logical extents 0 to 7659: Type thin-pool Monitoring monitored Chunk size 1.00 MiB Discards passdown Thin count 2 Transaction ID 2 Zero new blocks yes --- Logical volume --- LV Path /dev/vg_root/lv_root2 LV Name lv_root2 VG Name vg_root LV UUID 7qf7bi-WojP-p1of-YNPP-FUwj-neXH-6QujOR LV Write Access read/write LV Creation host, time vm_kvmtest, 2016-12-20 15:12:56 +0100 LV Pool name lv_thinpool LV Status available # open 0 LV Size 25.00 GiB Mapped size 0.00% Current LE 6400 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:4 --- Segments --- Virtual extents 0 to 6399: Type thin Device ID 1 --- Logical volume --- LV Path /dev/vg_root/lv_var2 LV Name lv_var2 VG Name vg_root LV UUID SHbsjl-gmFf-3mot-eN6l-jScB-Z0yX-AUNXes LV Write Access read/write LV Creation host, time vm_kvmtest, 2016-12-20 15:13:00 +0100 LV Pool name lv_thinpool LV Status available # open 1 LV Size 15.00 GiB Mapped size 98.47% Current LE 3840 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:5 --- Segments --- Virtual extents 0 to 3839: Type thin Device ID 2 # thin_dump -r -f human_readable /dev/mapper/vg_root-lv_thinpool_tmeta --> NOT Changed !