虚拟机增加磁盘空间

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最新推荐文章于 2025-04-24 17:46:29 发布

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分类专栏： Linux 文章标签： linux 磁盘虚拟机 lvm

本文链接：https://blog.youkuaiyun.com/joinplay/article/details/43704401

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1、更改虚拟机磁盘到30G到40G

2、

[root@localhost ~]# fdisk -l

Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 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: 0x0007e02e

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 2611 20458496 8e Linux LVM
/dev/sda3 2611 3916 10483750 8e Linux LVM

Disk /dev/mapper/VolGroup-lv_root: 29.5 GB, 29498540032 bytes
255 heads, 63 sectors/track, 3586 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: 2080 MB, 2080374784 bytes
255 heads, 63 sectors/track, 252 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

[root@localhost ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root ext4 27G 4.2G 22G 17% /
tmpfs tmpfs 242M 0 242M 0% /dev/shm
/dev/sda1 ext4 477M 49M 403M 11% /boot

3、格式化磁盘

[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
Command action
e extended
p primary partition (1-4)
p
Selected partition 4
First cylinder (3917-5221, default 3917):
Using default value 3917
Last cylinder, +cylinders or +size{K,M,G} (3917-5221, default 5221):
Using default value 5221

Command (m for help): t
Partition number (1-4): 4
Hex code (type L to list codes): 8e
Changed system type of partition 4 to 8e (Linux LVM)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

4、重启系统

5、创建PV（物理卷）

# pvcreate /dev/sda4
dev_is_mpath: failed to get device for 8:4
Physical volume "/dev/sda4" successfully created

[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup
PV Size 19.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 4994
Free PE 0
Allocated PE 4994
PV UUID esAhOX-P7To-Ln3d-vcfL-QPiH-easj-fLzs8m

--- Physical volume ---
PV Name /dev/sda3
VG Name VolGroup
PV Size 10.00 GiB / not usable 2.04 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 2559
Free PE 24
Allocated PE 2535
PV UUID V4Akix-450a-LAi2-37lA-0cfC-HXiT-PQzcfd

"/dev/sda4" is a new physical volume of "10.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sda4
VG Name
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID aYBMc5-8Zjm-rend-Q7b2-682Q-KpWq-r0DPjW

6、将PV添加到VG（卷组）

[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
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 29.50 GiB
PE Size 4.00 MiB
Total PE 7553
Alloc PE / Size 7529 / 29.41 GiB
Free PE / Size 24 / 96.00 MiB
VG UUID o5nqr9-x3CZ-tkHt-CXMx-Nr4m-Hy4A-gkjEiu

7、添加到卷组

[root@localhost ~]# vgextend VolGroup /dev/sda4

[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 3
Act PV 3
VG Size 39.50 GiB
PE Size 4.00 MiB
Total PE 10111
Alloc PE / Size 7529 / 29.41 GiB
Free PE / Size 2582 / 10.09 GiB
VG UUID o5nqr9-x3CZ-tkHt-CXMx-Nr4m-Hy4A-gkjEiu

8、扩展LV（逻辑卷）

[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/VolGroup/lv_root
LV Name lv_root
VG Name VolGroup
LV UUID HbrFzr-ooNo-oqIv-WKah-HYui-svZ5-cL3wmw
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2014-10-27 16:01:35 +0800
LV Status available
# open 1
LV Size 27.47 GiB
Current LE 7033
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Path /dev/VolGroup/lv_swap
LV Name lv_swap
VG Name VolGroup
LV UUID 1t05pO-HJ2E-OpyX-Ni0s-QB2f-R7zx-V4cFOF
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2014-10-27 16:01:38 +0800
LV Status available
# open 1
LV Size 1.94 GiB
Current LE 496
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

[root@localhost ~]# lvextend -L+10G /dev/VolGroup/lv_root
Extending logical volume lv_root to 37.47 GiB
Logical volume lv_root successfully resized

[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/VolGroup/lv_root
LV Name lv_root
VG Name VolGroup
LV UUID HbrFzr-ooNo-oqIv-WKah-HYui-svZ5-cL3wmw
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2014-10-27 16:01:35 +0800
LV Status available
# open 1
LV Size 37.47 GiB
Current LE 9593
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Path /dev/VolGroup/lv_swap
LV Name lv_swap
VG Name VolGroup
LV UUID 1t05pO-HJ2E-OpyX-Ni0s-QB2f-R7zx-V4cFOF
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2014-10-27 16:01:38 +0800
LV Status available
# open 1
LV Size 1.94 GiB
Current LE 496
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

上面看到逻辑卷已经增加，系统未增加

使用resize2fs命令将文件系统扩展到增加的空间上：

[root@localhost ~]# resize2fs /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/VolGroup/lv_root to 9823232 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 9823232 blocks long.

[root@localhost ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root ext4 37G 4.2G 31G 12% /
tmpfs tmpfs 242M 0 242M 0% /dev/shm
/dev/sda1 ext4 477M 49M 403M 11% /boot