kernel: Buffer I/O error on device dm-3, logical block 2449799
kernel: lost page write due to I/O error on dm-3

Jan 22 02:31:31 server kernel: device-mapper: thin: 253:2: reached low water mark for data device: sending event.
Jan 22 02:31:31 server kernel: device-mapper: thin: 253:2: switching pool to out-of-data-space mode
Jan 22 02:32:31 server kernel: device-mapper: thin: 253:2: switching pool to read-only mode

# lvs
  LV     VG     Attr       LSize  Pool   Origin Data%  Meta%  Move Log Cpy%Sync Convert
  pool00 centos twi-aotz-- 41.66g               100.00 46.82
  root   centos Vwi-aotz-- 50.00g pool00        83.33
  swap   centos -wi-ao---- 16.00g

#lvs
  LV     VG     Attr       LSize  Pool   Origin Data%  Meta%  Move Log Cpy%Sync Convert
  pool00 centos twi-aotzM- 41.66g               100.00 46.82
  root   centos Vwi-aotz-- 50.00g pool00        83.33

#df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   50G   10G   41G  20% /
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G     0  7.8G   0% /dev/shm
tmpfs                    7.8G   17M  7.8G   1% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/sda2                497M  154M  343M  31% /boot

fstrim -v -a

fstrim -v /