创建步骤
pvcreate /dev/vdb
vgcreate vgopt /dev/vdb
lvcreate -L 400G -n lvopt vgopt
lvcreate -L 50G -n lvoptlog vgopt
mkfs.ext4 /dev/vgopt/lvopt
mkfs.ext4 /dev/vgopt/lvoptlog
mount /dev/vgopt/lvopt /opt
mount /dev/vgopt/lvoptlog /opt/log
挂载完成后，需要写入/etc/fstab
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