【LVM】signature detected on /dev/

# cat create_lvm.sh

#!/bin/bash


# mkfs for data disk
pvcreate /dev/vdb
vgcreate vg_data /dev/vdb
lvcreate -l100%VG -n lv_data vg_data
mkfs -t xfs /dev/mapper/vg_data-lv_data

# copy file to data disk
mkdir -p  /data
chmod 755 /data
mount /dev/mapper/vg_data-lv_data /data

# set auto mount
echo '/dev/mapper/vg_data-lv_data /data xfs defaults 1 2'  >> /etc/fstab

# sh create_lvm.sh

WARNING: dos signature detected on /dev/vdb at offset 510. Wipe it? [y/n]: y
  Wiping dos signature on /dev/vdb.
  Physical volume "/dev/vdb" successfully created.
  Volume group "vg_data" successfully created
WARNING: xfs signature detected on /dev/vg_data/lv_data at offset 0. Wipe it? [y/n]: y
  Wiping xfs signature on /dev/vg_data/lv_data.
  Logical volume "lv_data" created.
meta-data=/dev/mapper/vg_data-lv_data isize=512    agcount=4, agsize=32767744 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=131070976, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=63999, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
Discarding blocks...Done.