kernel-5.14.0-427.el9    BUILT: Fri Feb 23 07:31:31 AM CET 2024
lvm2-2.03.23-2.el9    BUILT: Sat Feb  3 01:10:34 AM CET 2024
lvm2-libs-2.03.23-2.el9    BUILT: Sat Feb  3 01:10:34 AM CET 2024

From lvmvdo(7):
   1. Using multiple volumes using same VDOPoolLV
       You can convert existing VDO LV into a thin volume. After this conversion you can create a thin snapshot or you can add more thin volumes with thin-pool named after orignal LV name LV_tpool0.

       Example
       # lvcreate --type vdo -L 5G -V 10G -n vdo1 vg/vdopool
       # lvconvert --type thin vg/vdo1
       # lvcreate -V20 vg/vdo1_tpool0


[root@virt-019 ~]# lvcreate --yes --type vdo -n vdo_lv  -L 25G vdo_sanity -V 50G  
  Wiping vdo signature on /dev/vdo_sanity/vpool0.
    The VDO volume can address 22 GB in 11 data slabs, each 2 GB.
    It can grow to address at most 16 TB of physical storage in 8192 slabs.
    If a larger maximum size might be needed, use bigger slabs.
  Logical volume "vdo_lv" created.
[root@virt-019 ~]# mkfs --type xfs -f /dev/vdo_sanity/vdo_lv
meta-data=/dev/vdo_sanity/vdo_lv isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1    bigtime=1 inobtcount=1 nrext64=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=16384, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
Discarding blocks...Done.
 
[root@virt-019 ~]# lvconvert --yes --type thin vdo_sanity/vdo_lv
  Thin pool volume with chunk size 64.00 KiB can address at most <15.88 TiB of data.
  WARNING: Converting vdo_sanity/vdo_lv to fully provisioned thin volume.
  Converted vdo_sanity/vdo_lv to thin volume.
[root@virt-019 ~]# lvs -a -o +devices
  LV                    VG         Attr       LSize  Pool          Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices               
  [lvol0_pmspare]       vdo_sanity ewi------- 52.00m                                                              /dev/sda1(6413)       
  vdo_lv                vdo_sanity Vwi-a-tz-- 50.00g vdo_lv_tpool0        100.00                                                        
  vdo_lv_tpool0         vdo_sanity twi-aotz-- 50.00g                      100.00 34.97                            vdo_lv_tpool0_tdata(0)
  [vdo_lv_tpool0_tdata] vdo_sanity vwi-aov--- 50.00g vpool0               0.01                                    vpool0(0)             
  [vdo_lv_tpool0_tmeta] vdo_sanity ewi-ao---- 52.00m                                                              /dev/sda1(6400)       
  vpool0                vdo_sanity dwi------- 25.00g                      12.06                                   vpool0_vdata(0)       
  [vpool0_vdata]        vdo_sanity Dwi-ao---- 25.00g                                                              /dev/sda1(0)          
 
[root@virt-019 ~]#  lvcreate --yes --virtualsize 10G -T vdo_sanity/vdo_lv_tpool0 -n another_virt1
  WARNING: Sum of all thin volume sizes (60.00 GiB) exceeds the size of thin pool vdo_sanity/vdo_lv_tpool0 (50.00 GiB).
  WARNING: You have not turned on protection against thin pools running out of space.
  WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
  Logical volume "another_virt1" created.
[root@virt-019 ~]#  lvcreate --yes --virtualsize 10G -T vdo_sanity/vdo_lv_tpool0 -n another_virt2
  WARNING: Sum of all thin volume sizes (70.00 GiB) exceeds the size of thin pool vdo_sanity/vdo_lv_tpool0 (50.00 GiB).
  WARNING: You have not turned on protection against thin pools running out of space.
  WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
  Logical volume "another_virt2" created.
[root@virt-019 ~]#  lvcreate --yes --virtualsize 10G -T vdo_sanity/vdo_lv_tpool0 -n another_virt3
  WARNING: Sum of all thin volume sizes (80.00 GiB) exceeds the size of thin pool vdo_sanity/vdo_lv_tpool0 (50.00 GiB).
  WARNING: You have not turned on protection against thin pools running out of space.
  WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
  Logical volume "another_virt3" created.
[root@virt-019 ~]# mkfs /dev/vdo_sanity/another_virt3
mke2fs 1.46.5 (30-Dec-2021)
Discarding device blocks: done                            
Creating filesystem with 2621440 4k blocks and 655360 inodes
Filesystem UUID: 77ecf527-e2dc-47ae-9f9d-6868b671ca1d
Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
 
Allocating group tables: done                            
Writing inode tables: done                            
Writing superblocks and filesystem accounting information: mkfs.ext2: Input/output error while writing out and closing file system
 
 
Apr 23 21:27:36 virt-019 kernel: device-mapper: thin: 253:7: switching pool to out-of-data-space (error IO) mode
Apr 23 21:27:36 virt-019 kernel: buffer_io_error: 249 callbacks suppressed
Apr 23 21:27:36 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 0, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 1, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 2, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 3, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 4, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 5, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 6, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 7, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 8, lost async page write
Apr 23 21:27:37 virt-019 kernel: Buffer I/O error on dev dm-11, logical block 9, lost async page write