Centos7 LVM管理的邏輯卷根目錄擴容
fdisk /dev/sdb #對新加磁盤進行分區操作
pvcreate /dev/sdb1 #創建一個物理卷
vgs #查看現有的卷組
vgextend centos /dev/sdb1 #將創建的物理卷擴展至現有的root卷組
lvs #查看現有邏輯卷
lvextend -L +1.95T /dev/centos/root #將空間擴展至根分區的邏輯卷中
xfs_growfs /dev/centos/root #格式化擴展的邏輯卷，如果是ext4格式的文件，使用resize2fs 對ext4格式的磁盤格式化
/var目錄擴容
1、查看初始的磁盤目錄
[root@localhost ~]# df -HT
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 4.1G 0 4.1G 0% /dev
tmpfs tmpfs 4.2G 0 4.2G 0% /dev/shm
tmpfs tmpfs 4.2G 9.3M 4.1G 1% /run
tmpfs tmpfs 4.2G 0 4.2G 0% /sys/fs/cgroup
/dev/mapper/centos-root xfs 11G 2.2G 8.1G 21% /
/dev/mapper/centos-var xfs 2.2G 145M 2.0G 7% /var
/dev/mapper/centos-home xfs 2.2G 34M 2.2G 2% /home
/dev/sda1 xfs 521M 145M 377M 28% /boot
tmpfs tmpfs 821M 0 821M 0% /run/user/0
2、服務器增加一個硬盤並分區
[root@localhost ~]# fdisk -l
...
Disk /dev/sdb: 4294 MB, 4294967296 bytes, 8388608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x2e0f7732
Device Boot Start End Blocks Id System
/dev/sdb1 2048 8388607 4193280 8e Linux LVM
3、查看var所在的卷組（查看到VG Name：centos）
[root@localhost ~]# lvdisplay .... --- Logical volume --- LV Path /dev/centos/var LV Name var VG Name centos LV UUID rRzpmV-wmlt-0IHk-KBR8-rRRy-BBxs-VJ92E5 LV Write Access read/write LV Creation host, time localhost, 2020-06-12 16:37:42 -0400 LV Status available # open 1 LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:3 #VG默認信息 [root@localhost ~]# vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 4 Open LV 4 Max PV 0 Cur PV 1 Act PV 1 VG Size <15.51 GiB PE Size 4.00 MiB Total PE 3970 Alloc PE / Size 3969 / 15.50 GiB Free PE / Size 1 / 4.00 MiB VG UUID fvDOrI-1z8x-7Lkq-s8kR-9UfE-UpEa-BkVVjH
4、擴容/var目錄所在的vg和lv
#擴容VG
[root@localhost ~]# vgextend centos /dev/sdb1
Volume group "centos" successfully extended
#擴容LV
[root@localhost ~]# lvextend -L +2G /dev/centos/var
Size of logical volume centos/var changed from 2.00 GiB (512 extents) to 4.00 GiB (1024 extents).
Logical volume centos/var successfully resized.
#更新
[root@localhost ~]# xfs_growfs /dev/centos/var
5、查看磁盤空間
df -Th
https://www.cnblogs.com/kevingrace/p/5825963.html
umount /home 卸載掉/home目錄
vi /etc/fstab 編輯分區表文件，注釋掉/home分區
systemctl reboot 重啟
df -h 查看磁盤情況
Mount 查看掛載情況
vgdisplay -v 查看lvm情況
lvremove /dev/cl/home 刪除/home分區
vgdisplay -v 查看lvm情況
lvextend -L850GiB /dev/cl/root 將磁盤空間添加給/目錄
vgdisplay -v
xfs_growfs /dev/cl/root
df -h
systemctl reboot