RHEL6.1下LVM扩容
RHEL6.1下LVM扩容
打算给系统装一个Oracle,发现磁盘空间不足。在安装系统的时候我选择的是自动分区,系统就会自动以LVM的方式分区。为了保证系统后期的可用性,建议所有新系统安装都采用LVM,之后生产上的设备我也打算这样做。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。
Disk /dev/sdb: 16.1 GB, 16106127360 bytes
............................
Disk /dev/sdb doesn't contain a valid partition table
(二)创建物理卷(PV)
pvcreate /dev/sdb
查看系统PV的情况:
[root@localhost ~]# pvdisplay
--- 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 ~]# 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
Free PE / Size 0 / 0
VG UUID FnUsmX-s284-GeRK-hJNJ-BbIG-Vpe7-OuFZE1
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