lvm 扩容

虚拟机新加块磁盘

[root@app-dev ~]# fdisk -l
...
Disk /dev/mapper/VolGroup-lv_root: 28.5 GB, 28462546944 bytes
255 heads, 63 sectors/track, 3460 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/xvdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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

新磁盘划个分区

[root@app-dev ~]# fdisk /dev/xvdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x87f4dc6c.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

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
Partition number (1-4): 1
First cylinder (1-3916, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-3916, default 3916):
Using default value 3916

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

Calling ioctl() to re-read partition table.
Syncing disks.

分区变成pv

[root@app-dev ~]# pvcreate /dev/xvdb1
Physical volume "/dev/xvdb1" successfully created
[root@app-dev ~]# pvscan
PV /dev/xvda2   VG VolGroup   lvm2 [29.51 GiB / 0    free]
PV /dev/xvdb1                 lvm2 [30.00 GiB]
Total: 2 [59.51 GiB] / in use: 1 [29.51 GiB] / in no VG: 1 [30.00 GiB]
[root@app-dev ~]# pvdisplay
--- Physical volume ---
PV Name               /dev/xvda2
VG Name               VolGroup
PV Size               29.51 GiB / not usable 3.00 MiB
Allocatable           yes (but full)
PE Size               4.00 MiB
Total PE              7554
Free PE               0
Allocated PE          7554
PV UUID               AsBSbC-3piI-LIjs-S2TF-aAVt-JWzn-84hVUH

"/dev/xvdb1" is a new physical volume of "30.00 GiB"
--- NEW Physical volume ---
PV Name               /dev/xvdb1
VG Name
PV Size               30.00 GiB
Allocatable           NO
PE Size               0
Total PE              0
Free PE               0
Allocated PE          0
PV UUID               ctes1o-Nu0w-Zxwl-HxdT-Ac13-NDre-AqAJXl

pv加入到vg

[root@app-dev ~]# vgextend VolGroup /dev/xvdb1
Volume group "VolGroup" successfully extended
[root@app-dev ~]# 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               59.50 GiB
PE Size               4.00 MiB
Total PE              15233
Alloc PE / Size       7554 / 29.51 GiB
Free  PE / Size       7679 / 30.00 GiB
VG UUID               Ldd34L-2fWI-6IXW-HEWV-EeHL-bXFG-0LOVVP

扩大需要的lv

[root@app-dev ~]# lvextend -l +7679 /dev/mapper/VolGroup-lv_root
Size of logical volume VolGroup/lv_root changed from 26.51 GiB (6786 extents) to 56.50 GiB (14465 extents).
Logical volume lv_root successfully resized

更新下文件系统

[root@app-dev ~]# 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 = 2, new_desc_blocks = 4
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 14812160 (4k) blocks.

The filesystem on /dev/mapper/VolGroup-lv_root is now 14812160 blocks long.

看看磁盘变大了没

[root@app-dev ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
56G   24G   30G  44% /
tmpfs                 3.9G  4.0K  3.9G   1% /dev/shm
/dev/xvda1            477M  112M  340M  25% /boot