一：减少/home空间
1.1：备份/home实质
cp -r/home/* /homebak
1.2：简略过载/home
umount /home
1.3：简略/home地方lv
lvremove /dev/mapper/centos-home
1.4：从新创造home的lv
lvcreate -L 6G -n home centos
L表白巨细，默许单元为M；n表白卷名；这边的centos是CentOS7安置体例的功夫就默许创造好的卷组名
1.5：文献体例方法为xfs
mkfs.xfs /dev/mapper/centos-home
1.6：过载
mount /dev/mapper/centos-home /home
二：兴建卷
2.1：察看卷组结余空间
vgdisplay
[root@zz-01 /]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size <79.00 GiB
PE Size 4.00 MiB
Total PE 20223
Alloc PE / Size 15328 / <59.88 GiB
Free PE / Size 4895 / 19.12 GiB
VG UUID Zdq2BR-i6R3-m43i-cezu-7Eb1-f9cR-aIU0MV
2.2：从新创造xxx的lv
lvcreate -L 19G -n xxx centos
L表白巨细，默许单元为M；n表白卷名；这边的centos是CentOS7安置体例的功夫就默许创造好的卷组名
2.3：文献体例方法为xfs
mkfs.ext4 /dev/mapper/centos-xxx
2.4：过载
mount /dev/mapper/centos-xxx /xxx
三：TiDB情况安置，2.3发端安排为以次办法
3.1：创造分区表：（此办法我没有做）
parted -s -a optimal /dev/nvme0n1 mklabel gpt — mkpart primary ext4 1 -1
3.2：创造分区并方法化文献体例：
lvcreate -L 19G -n ext4 centos
mkfs.ext4 /dev/mapper/centos-ext4
3.3：察看磁盘分区的UUID
lsblk -f
[root@zz-01 /]# lsblk -f
NAME FSTYPE LABEL UUID MOUNTPOINT
sr0 iso9660 XenServer Tools 2018-08-24-08-03-46-00
xvda
├─xvda1 xfs 37ea57d3-ab8d-4a8f-b89d-c2ccf17bec51 /boot
└─xvda2 LVM2_member RNDG3e-7Z6F-xACd-0vro-KM2P-NOc5-CK2M2Z
├─centos-root xfs 080adf4c-d428-471f-82c9-cd48209e1d08 /
├─centos-swap swap 1b52bb06-5ffa-41bc-86a7-d9ddc7252594 [SWAP]
├─centos-home xfs 7e6acd9f-85e7-4296-8d4c-fcec218d7501 /home
└─centos-ext4 ext4 a45530a9-8b07-4b9e-b78b-d6480e239dea
3.4：vim /etc/fstab 增添
UUID=a45530a9-8b07-4b9e-b78b-d6480e239dea /ext4 ext4 defaults,nodelalloc,noatime 0 2
3.5：mkdir /ext4
3.6：mount -a
3.7：mount -t ext4
[root@zz-01 /]# mount -t ext4
/dev/mapper/centos-ext4 on /ext4 type ext4 (rw,noatime,nodelalloc,data=ordered)