大于2T:
挂载步骤：
pvcreate /dev/sdb
vgcreate vg_ssd /dev/sdb
lvcreate -L 1.74T -n lv_ssd vg_ssd
mkfs.xfs /dev/vg_ssd/lv_ssd
pvcreate /dev/sdc
vgcreate vg_sata /dev/sdc
lvcreate -L 58.2T -n lv_sata vg_sata
mkfs.xfs /dev/vg_sata/lv_sata
mkdir /ssd /sata
vim /etc/fstab
/dev/vg_sata/lv_sata /sata xfs defaults 0 0
/dev/vg_ssd/lv_ssd /ssd xfs defaults 0 0
mount -a
删除lvm步骤与挂载步骤相反