Linux 扩展/dev/mapper/VolGroup-lv_root容量
Linux 扩展/dev/mapper/VolGroup-lv_root容量
Max.Bai
2018-05
记录一次centos磁盘空间不足，扩展磁盘空间的过程。
使用中发现/dev/mapper/VolGroup-lv_root 使用100%，总空间有15G，下面就扩展磁盘空间过程做一个记录。
# Step 0: 查看磁盘空间，lv_root 经常100%，目的扩容 lv_root
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
12G 3.2G 7.7G 30% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 32M 429M 7% /boot# Step 1：给VM添加磁盘大小，原来15G ，选择磁盘，扩展，扩容增加到100G，此处不贴图了
# Step 2：fdisk 查看磁盘信息
[root@localhost ~]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes # 磁盘扩容到100G
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c9934
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 2089 16264192 8e Linux LVM
Disk /dev/mapper/VolGroup-lv_root: 12.5 GB, 12490637312 bytes
255 heads, 63 sectors/track, 1518 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_swap: 4160 MB, 4160749568 bytes
255 heads, 63 sectors/track, 505 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000#Step 3：fdisk 进入/dev/sda, 创建新分区 /dev/sda3
[root@localhost ~]# fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n # new 新分区
Command action
e extended
p primary partition (1-4)
p # 选择主分区
Partition number (1-4): 3 # 分区序号 3
First cylinder (2089-13054, default 2089): # 分区开始块，回车使用默认
Using default value 2089
Last cylinder, +cylinders or +size{K,M,G} (2089-13054, default 13054): # 分区结束块，回车使用默认
Using default value 13054
Command (m for help): t # 修改分区格式
Partition number (1-4): 3 # 选择分区序号
Hex code (type L to list codes): 8e # 格式选择8e linux LVM
Changed system type of partition 3 to 8e (Linux LVM)
Command (m for help): p # 显示分区信息
Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c9934
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 2089 16264192 8e Linux LVM
/dev/sda3 2089 13054 88079039 8e Linux LVM # 新建的分区，格式8e
Command (m for help): w # 保存信息
The partition table has been altered!# Step 4：重启
[root@localhost ~]# shutdown -r now# Step 5：创建物理卷
[root@ganxide ~]# pvcreate /dev/sda3
Writing physical volume data to disk "/dev/sda3"
Physical volume "/dev/sda3" successfully created# Step 6： 查看新建的物理卷和大小
[root@ganxide ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup # lv_root卷组
PV Size 15.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 3970
Free PE 0
Allocated PE 3970
PV UUID 1GHup8-7fYH-IpYZ-QPgO-cxSl-on5z-M9oPrU
"/dev/sda3" is a new physical volume of "84.00 GiB" #新的物理卷
--- NEW Physical volume ---
PV Name /dev/sda3 # 卷名
VG Name # 卷组
PV Size 84.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID ZnLTXE-nGPK-jQAq-wMwy-f1Mb-5cvQ-4lhkmU# Step 7：添加新的物理卷到lv_root同一个卷组
[root@ganxide ~]# vgextend VolGroup /dev/sda3
Volume group "VolGroup" successfully extended# Step 8：查看卷组信息
[root@ganxide ~]# vgdisplay
--- Volume group ---
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 99.50 GiB
PE Size 4.00 MiB
Total PE 25473
Alloc PE / Size 3970 / 15.51 GiB
Free PE / Size 21503 / 84.00 GiB # 未分配空间
VG UUID pwCU5u-NikD-vMp3-goth-CXJU-Pf18-0ihmoV# Step 9：增加lv_root的大小，增加50G
[root@ganxide ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
12G 5.3G 5.7G 49% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 32M 429M 7% /boot
[root@ganxide ~]# lvresize -L +50G /dev/mapper/VolGroup-lv_root
Extending logical volume lv_root to 61.63 GiB
Logical volume lv_root successfully resized# Step 10：重新识别大小， xfs_qrowfs 是centos7的命令，在centos6.X中是resize2fs
[root@ganxide ~]# resize2fs /dev/mapper/VolGroup-lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 4
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 16156672 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 16156672 blocks long.# Step 11：查看扩容后的大小
[root@ganxide ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
61G 5.3G 53G 10% / # 空间增加到61G 原来只有15G
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 32M 429M 7% /boot参考：
http://m.111cn.net/art-102479.htm
http://www.mamicode.com/info-detail-1448085.html