LINUX在逻辑卷基础加盘操作步骤

时间：2017-09-20 00:59:10 阅读：340 评论：0 收藏：0 [点我收藏+]

扩容之前的磁盘状况

[root@localhost ~]# df -h
文件系统             容量已用可用已用%%挂载点
/dev/mapper/VolGroup-lv_root 5.3G  2.5G  2.6G  50% /
tmpfs                 538M     0  538M   0% /dev/shm
/dev/sda1             485M   30M  430M   7% /boot
[root@localhost ~]# fdisk -l
Disk /dev/sda: 8589 MB, 8589934592 bytes
...............
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        1045     7875584   8e  Linux LVM

Disk /dev/mapper/VolGroup-lv_root: 5779 MB, 5779750912 bytes
........
Disk /dev/mapper/VolGroup-lv_swap: 2281 MB, 2281701376 bytes
.........

此次扩容的方案为：

1、加1个5G的空间给/

2、加1个10G的空间给/oracle

（一）在VM中加一个15G的磁盘

重启后#fdisk –l可以看到新的磁盘已经认出来了。查看磁盘是否已经添加

Disk /dev/sdb: 16.1 GB, 16106127360 bytes
...........................

（二）创建一个物理卷(PV)

1.#pvcreate /dev/sdb

2.查看系统PV的情况：

2.[root@localhost ~]# pvdisplay：查看空间情况
--- Physical volume ---
PV Name               /dev/sda2  //原有硬盘上的PV
VG Name               VolGroup
PV Size               7.51 GiB / not usable 3.00 MiB
Allocatable           yes (but full)
PE Size               4.00 MiB
Total PE              1922
Free PE               0
Allocated PE          1922
PV UUID               SGH1dY-4tp2-Nr1a-w93Z-V4LA-pQBh-VGzzTH
"/dev/sdb" is a new physical volume of "15.00 GiB"
--- NEW Physical volume ---
PV Name               /dev/sdb
VG Name                //新建的PV的VG name是空的，下一步就是把PV加入VG
PV Size               15.00 GiB
Allocatable           NO
PE Size               0
Total PE              0
Free PE               0
Allocated PE          0
PV UUID               8TZUlz-YyUp-RBvf-lSzm-7MgG-DSZS-qNqX1Z

查看原VG的情况

[root@localhost ~]#3. vgdisplay
--- Volume group ---
VG Name               VolGroup //注意记录此名字，扩容时将新的pv加入指定的名字
System ID
Format                lvm2
Metadata Areas        1
Metadata Sequence No  3
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                2
Open LV               2
Max PV                0
Cur PV                1
Act PV                1
VG Size               7.51 GiB
PE Size               4.00 MiB
Total PE              1922
AllocPE / Size       1922 / 7.51 GiB：查看磁盘情况
Free  PE / Size       0 / 0
VG UUID               FnUsmX-s284-GeRK-hJNJ-BbIG-Vpe7-OuFZE1

4.[root@localhost ~]# vgextend VolGroup /dev/sdb
#扩展卷组,将/dev/sdb物理卷添加到VolGroup卷组中
Volume group "VolGroup" successfully extended
再查看VG情况，可以看到VG大小变化，空余空间。
[root@localhost ~]# 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               22.50 GiB
PE Size               4.00 MiB
Total PE              5761
AllocPE / Size       1922 / 7.51 GiB
Free  PE / Size       3839 / 15.00 GiB
VG UUID               FnUsmX-s284-GeRK-hJNJ-BbIG-Vpe7-OuFZE1

（四）将新的VG空间划入LV（扩容lv_root）

5.#直接扩展5G给/root分区，不用umount，也不需要重启

# lvextend -L +5G /dev/mapper/VolGroup-lv_root
或者：lvextend -l+5387 /dev/mapper/VolGroup-lv_root
Extending logical volume lv_root to 10.38 GiB
Logical volume lv_root successfully resized

也可以使用命令