●●● [root@macbook ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda3 fedora_macbook lvm2 a-- 70.00g 0 /dev/sda4 lvm2 --- 161.17g 161.17g [root@macbook ~]# vgs VG #PV #LV #SN Attr VSize VFree fedora_macbook 1 1 0 wz--n- 70.00g 0 [root@macbook ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root fedora_macbook -wi-ao---- 70.00g [root@macbook ~]# ●●● [root@macbook ~]# pvcreate /dev/sda4 Physical volume "/dev/sda4" successfully created. [root@macbook ~]# vgcreate vg_banana /dev/sda4 Volume group "vg_banana" successfully created [root@macbook ~]# lvcreate --type thin-pool -n pool0 -l 95%FREE vg_banana Thin pool volume with chunk size 128.00 KiB can address at most 31.75 TiB of data. Logical volume "pool0" created. [root@macbook ~]# lvcreate -n lv_banana -V 20G --thin-pool pool0 vg_banana Logical volume "lv_banana" created. [root@macbook ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root fedora_macbook -wi-ao---- 70.00g lv_banana vg_banana Vwi-a-tz-- 20.00g pool0 0.00 pool0 vg_banana twi-aotz-- 152.95g 0.00 10.42 ●●● [root@macbook ~]# mkfs.xfs /dev/vg_banana/lv_banana [root@macbook ~]# mount /dev/vg_banana/lv_banana /mnt/test ●●●スナップ無し NAME=thin_sequential_1st fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=write > ~/$(date +%Y%m%d.%H%M%S).$NAME.write.txt; echo $? fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=read > ~/$(date +%Y%m%d.%H%M%S).$NAME.read.txt; echo $? [root@macbook ~]# egrep 'write:|read:' *txt | awk '{print $1,$4}' 20260303.055025.thin_sequential_1st.write.txt: BW=355MiB/s 20260303.055034.thin_sequential_1st.read.txt: BW=542MiB/s ●●●スナップ１つ [root@macbook ~]# lvcreate --snapshot --name lv_banana_ss_1 vg_banana/lv_banana Logical volume "lv_banana_ss_1" created. [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 10.32 lv_banana_ss_1 vg_banana Vwi---tz-k 20.00g pool0 lv_banana pool0 vg_banana twi-aotz-- 152.95g 1.35 10.92 NAME=thin_sequential_2nd fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=write > ~/$(date +%Y%m%d.%H%M%S).$NAME.write.txt; echo $? fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=read > ~/$(date +%Y%m%d.%H%M%S).$NAME.read.txt; echo $? [root@macbook ~]# ls -lh /mnt/test/ total 4.0G -rw-r--r--. 1 root root 2.0G Mar 3 05:50 thin_sequential_1st.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:53 thin_sequential_2nd.0.0 [root@macbook ~]# egrep 'write:|read:' *txt | awk '{print $1,$4}' 20260303.055025.thin_sequential_1st.write.txt: BW=355MiB/s 20260303.055034.thin_sequential_1st.read.txt: BW=542MiB/s 20260303.055316.thin_sequential_2nd.write.txt: BW=370MiB/s 20260303.055327.thin_sequential_2nd.read.txt: BW=535MiB/s ●●●スナップ２つ [root@macbook ~]# lvcreate --snapshot --name lv_banana_ss_2 vg_banana/lv_banana Logical volume "lv_banana_ss_2" created. [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 20.32 lv_banana_ss_1 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_2 vg_banana Vwi---tz-k 20.00g pool0 lv_banana pool0 vg_banana twi-aotz-- 152.95g 2.66 11.25 NAME=thin_sequential_3rd fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=write > ~/$(date +%Y%m%d.%H%M%S).$NAME.write.txt; echo $? fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=read > ~/$(date +%Y%m%d.%H%M%S).$NAME.read.txt; echo $? [root@macbook ~]# ls -lh /mnt/test/ total 6.0G -rw-r--r--. 1 root root 2.0G Mar 3 05:50 thin_sequential_1st.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:53 thin_sequential_2nd.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:54 thin_sequential_3rd.0.0 [root@macbook ~]# egrep 'write:|read:' *txt | awk '{print $1,$4}' 20260303.055025.thin_sequential_1st.write.txt: BW=355MiB/s 20260303.055034.thin_sequential_1st.read.txt: BW=542MiB/s 20260303.055316.thin_sequential_2nd.write.txt: BW=370MiB/s 20260303.055327.thin_sequential_2nd.read.txt: BW=535MiB/s 20260303.055451.thin_sequential_3rd.write.txt: BW=331MiB/s 20260303.055459.thin_sequential_3rd.read.txt: BW=545MiB/s ●●●スナップ３つ [root@macbook ~]# lvcreate --snapshot --name lv_banana_ss_3 vg_banana/lv_banana Logical volume "lv_banana_ss_3" created. [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 30.33 lv_banana_ss_1 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_2 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_3 vg_banana Vwi---tz-k 20.00g pool0 lv_banana pool0 vg_banana twi-aotz-- 152.95g 3.97 11.60 [root@macbook ~]# NAME=thin_sequential_4th fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=write > ~/$(date +%Y%m%d.%H%M%S).$NAME.write.txt; echo $? fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=read > ~/$(date +%Y%m%d.%H%M%S).$NAME.read.txt; echo $? [root@macbook ~]# ls -lh /mnt/test/ total 8.0G -rw-r--r--. 1 root root 2.0G Mar 3 05:50 thin_sequential_1st.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:53 thin_sequential_2nd.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:54 thin_sequential_3rd.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:57 thin_sequential_4th.0.0 [root@macbook ~]# egrep 'write:|read:' *txt | awk '{print $1,$4}' 20260303.055025.thin_sequential_1st.write.txt: BW=355MiB/s 20260303.055034.thin_sequential_1st.read.txt: BW=542MiB/s 20260303.055316.thin_sequential_2nd.write.txt: BW=370MiB/s 20260303.055327.thin_sequential_2nd.read.txt: BW=535MiB/s 20260303.055451.thin_sequential_3rd.write.txt: BW=331MiB/s 20260303.055459.thin_sequential_3rd.read.txt: BW=545MiB/s 20260303.055707.thin_sequential_4th.write.txt: BW=328MiB/s 20260303.055717.thin_sequential_4th.read.txt: BW=459MiB/s ●●●スナップ４つ [root@macbook ~]# lvcreate --snapshot --name lv_banana_ss_4 vg_banana/lv_banana Logical volume "lv_banana_ss_4" created. [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 40.33 lv_banana_ss_1 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_2 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_3 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_4 vg_banana Vwi---tz-k 20.00g pool0 lv_banana pool0 vg_banana twi-aotz-- 152.95g 5.27 11.95 [root@macbook ~]# NAME=thin_sequential_5th fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=write > ~/$(date +%Y%m%d.%H%M%S).$NAME.write.txt; echo $? fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=read > ~/$(date +%Y%m%d.%H%M%S).$NAME.read.txt; echo $? [root@macbook ~]# ls -lh /mnt/test/ total 10G -rw-r--r--. 1 root root 2.0G Mar 3 05:50 thin_sequential_1st.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:53 thin_sequential_2nd.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:54 thin_sequential_3rd.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:57 thin_sequential_4th.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:59 thin_sequential_5th.0.0 [root@macbook ~]# egrep 'write:|read:' *txt | awk '{print $1,$4}' 20260303.055025.thin_sequential_1st.write.txt: BW=355MiB/s 20260303.055034.thin_sequential_1st.read.txt: BW=542MiB/s 20260303.055316.thin_sequential_2nd.write.txt: BW=370MiB/s 20260303.055327.thin_sequential_2nd.read.txt: BW=535MiB/s 20260303.055451.thin_sequential_3rd.write.txt: BW=331MiB/s 20260303.055459.thin_sequential_3rd.read.txt: BW=545MiB/s 20260303.055707.thin_sequential_4th.write.txt: BW=328MiB/s 20260303.055717.thin_sequential_4th.read.txt: BW=459MiB/s 20260303.055902.thin_sequential_5th.write.txt: BW=343MiB/s 20260303.055915.thin_sequential_5th.read.txt: BW=463MiB/s ●●●スナップ無し [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 50.33 lv_banana_ss_1 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_2 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_3 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_4 vg_banana Vwi---tz-k 20.00g pool0 lv_banana pool0 vg_banana twi-aotz-- 152.95g 6.58 12.30 [root@macbook ~]# lvremove vg_banana/lv_banana_ss_1 Logical volume "lv_banana_ss_1" successfully removed. ●yes/no 確認無 [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 50.33 lv_banana_ss_2 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_3 vg_banana Vwi---tz-k 20.00g pool0 lv_banana lv_banana_ss_4 vg_banana Vwi---tz-k 20.00g pool0 lv_banana pool0 vg_banana twi-aotz-- 152.95g 6.58 12.29 [root@macbook ~]# lvremove vg_banana/lv_banana_ss_2 vg_banana/lv_banana_ss_3 vg_banana/lv_banana_ss_4 Logical volume "lv_banana_ss_2" successfully removed. Logical volume "lv_banana_ss_3" successfully removed. Logical volume "lv_banana_ss_4" successfully removed. [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 50.33 pool0 vg_banana twi-aotz-- 152.95g 6.58 12.23 [root@macbook ~]# NAME=thin_sequential_6th fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=write > ~/$(date +%Y%m%d.%H%M%S).$NAME.write.txt; echo $? fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g --bs=1024k --readwrite=read > ~/$(date +%Y%m%d.%H%M%S).$NAME.read.txt; echo $? [root@macbook ~]# ls -lh /mnt/test/ total 12G -rw-r--r--. 1 root root 2.0G Mar 3 05:50 thin_sequential_1st.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:53 thin_sequential_2nd.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:54 thin_sequential_3rd.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:57 thin_sequential_4th.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 05:59 thin_sequential_5th.0.0 -rw-r--r--. 1 root root 2.0G Mar 3 06:03 thin_sequential_6th.0.0 [root@macbook ~]# egrep 'write:|read:' *txt | awk '{print $1,$4}' 20260303.055025.thin_sequential_1st.write.txt: BW=355MiB/s 20260303.055034.thin_sequential_1st.read.txt: BW=542MiB/s 20260303.055316.thin_sequential_2nd.write.txt: BW=370MiB/s 20260303.055327.thin_sequential_2nd.read.txt: BW=535MiB/s 20260303.055451.thin_sequential_3rd.write.txt: BW=331MiB/s 20260303.055459.thin_sequential_3rd.read.txt: BW=545MiB/s 20260303.055707.thin_sequential_4th.write.txt: BW=328MiB/s 20260303.055717.thin_sequential_4th.read.txt: BW=459MiB/s 20260303.055902.thin_sequential_5th.write.txt: BW=343MiB/s 20260303.055915.thin_sequential_5th.read.txt: BW=463MiB/s 20260303.060300.thin_sequential_6th.write.txt: BW=326MiB/s 20260303.060309.thin_sequential_6th.read.txt: BW=540MiB/s [root@macbook ~]# ●●● [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 60.33 pool0 vg_banana twi-aotz-- 152.95g 7.89 12.55 [root@macbook ~]# rm /mnt/test/thin_sequential_* -fv removed '/mnt/test/thin_sequential_1st.0.0' removed '/mnt/test/thin_sequential_2nd.0.0' removed '/mnt/test/thin_sequential_3rd.0.0' removed '/mnt/test/thin_sequential_4th.0.0' removed '/mnt/test/thin_sequential_5th.0.0' removed '/mnt/test/thin_sequential_6th.0.0' [root@macbook ~]# rm /mnt/test/thin_sequential_* -fv [root@macbook ~]# [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 60.33 pool0 vg_banana twi-aotz-- 152.95g 7.89 12.61 [root@macbook ~]# fstrim --dry-run --verbose /mnt/test /mnt/test: 0 B (dry run) trimmed [root@macbook ~]# echo $? 0 [root@macbook ~]# fstrim --verbose /mnt/test /mnt/test: 20 GiB (21474836480 bytes) trimmed [root@macbook ~]# echo $? 0 [root@macbook ~]# lvs vg_banana LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_banana vg_banana Vwi-aotz-- 20.00g pool0 0.32 pool0 vg_banana twi-aotz-- 152.95g 0.04 10.44 ●●● ●●● ●●●