环境：CentOS 7，分区使用的是默认分区。
一台机器共有4块2T的硬盘，在sda上已经安装有系统，想要扩容。参考网页内容。
仍然存在的问题是，vg扩展到6T以后，vl只能扩展到4T，无法继续扩容，待解决。
结果！！！！居然分次extend就可以继续extend了！！如下所示！！！简直给跪！所以造成这个结果的原因是我这个+后面的数字算错了！！！太弱智了！
[root@localhost ~]# lvextend -L +360558 /dev/centos/home
Rounding size to boundary between physical extents: 352.11 GiB
Size of logical volume centos/home changed from 4.03 TiB (1056286 extents) to 4.37 TiB (1146426 extents).
Logical volume home successfully resized.
[root@localhost ~]# lvextend -L +360558 /dev/centos/home
Rounding size to boundary between physical extents: 352.11 GiB
Insufficient free space: 90140 extents needed, but only 90138 available
[root@localhost ~]# lvextend -L +90138 /dev/centos/home
Rounding size to boundary between physical extents: 88.03 GiB
Size of logical volume centos/home changed from 5.06 TiB (1326706 extents) to 5.15 TiB (1349241 extents).
Logical volume home successfully resized.
1. 查看当前lvm的情况（/dev/sda2）
首先fdisk -l查看当前的分区情况如下所示，sda，sdb，sdc，sdd四块硬盘均已分区，sdbcd各自分为了一个大区，其中sda已有lvm分区/dev/sda2。
[root@localhost ~]# fdisk -l
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 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: 0x0007dc9b
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 3907028991 1953001472 8e Linux LVM
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes, 3907029168 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: 0xc3897539
Device Boot Start End Blocks Id System
/dev/sdc1 2048 3907029167 1953513560 83 Linux
Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes, 3907029168 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: 0xc3897517
Device Boot Start End Blocks Id System
/dev/sdd1 2048 3907029167 1953513560 83 Linux
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes, 3907029168 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: 0xc389752b
Device Boot Start End Blocks Id System
/dev/sdb1 2048 3907029167 1953513560 83 Linux
Disk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 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 /dev/mapper/centos-swap: 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 /dev/mapper/centos-home: 1941.8 GB, 1941824339968 bytes, 3792625664 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
使用命令vgdisplay和lvdisplay查看当前的卷组（Volume group）和逻辑卷（Logical volumes）情况。
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
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 1.82 TiB
PE Size 4.00 MiB
Total PE 476806
Alloc PE / Size 476791 / 1.82 TiB
Free PE / Size 15 / 60.00 MiB
VG UUID o56Jrx-kGgK-bfPO-fROL-5UB1-m21V-K3vi9Z
lv情况如下，分为/dev/centos/swap、/dev/centos/home、 /dev/centos/root三个lv：
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID H7KpXK-YjfS-ssLE-7gbx-xNnt-QJsQ-hEWcu0
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-01-02 20:26:29 +0800
LV Status available
# open 2
LV Size 4.00 GiB
Current LE 1024
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID kveGiy-O6Y2-OMqN-2Ec2-76Ls-TdDh-1Rl3uu
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-01-02 20:26:29 +0800
LV Status available
# open 1
LV Size 1.77 TiB
Current LE 462967
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID lOLgfM-Jw1f-zH5e-IOld-kVok-Jr0f-IhNfAK
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-01-02 20:27:08 +0800
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
2.向当前VG增加一块磁盘sdb的容量
-
创建一个新的linux lvm格式的分区/dev/sdb1。如果/dev/sdb没有分区，则先分区。而我们的/dev/sdb已经分区为/dev/sdb1一个分区，所以可以直接转换为lvm分区：
fdisk /dev/sdb
t #修改分区格式
8e #指定为LVM分区
w #写入分区表
partprobe #重读分区表 -
给新分区创建PV，加入VG，LV
pvcreate /dev/sdb1
加入VG
vgextend centos /dev/sdb1
扩展LV
lvdisplay
lvextend -L xxxxx /dev/centos/home （增大到xxxxx）
或者# lvextend -L +xxxx /dev/centos/home （比原来增加xxxx）
重设LV大小resize2fs /dev/centos/home
如果文件系统为xfs则使用xfs_growfs /dev/centos/home
df -h
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