Linux磁盘扩容LVM步骤教程,linux磁盘扩容lvm
Linux磁盘扩容LVM步骤教程,linux磁盘扩容lvm
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。
扩容步骤
1. 查看磁盘设备
命令:# fdisk -l
结果:
Disk /dev/sda: 697.9 GB, 697932185600 bytes 255 heads, 63 sectors/track, 84852 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: 0x00054716 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 39163 314059776 8e Linux LVM找到需要扩展的磁盘设备
2.使用fdisk /dev/sda 对磁盘进行分区
命令:# fdisk /dev/sda
结果:
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 partit p Partition number (1-4): 3 First cylinder (39163-84852, default 39163): Using default value 39163 Last cylinder, +cylinders or +size{K,M,G} (39163-84852, default 84852): Using default value 84852 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.
依次输入n,p, 3(分区号,根据实际情况配置),enter,enter ,最后按w保存
之前最大的分区号是2,所以将本分区号设置为3,本人理解。
3.使用fdisk -l查看分区是否创建成功
命令:fdisk -l
结果:
本结果应该是有3个分区才正确,这里不给出结果内容
4.重启机器
命令:# reboot
因为只有重启后,才能正式生效。
5.使用pvcreate创建物理卷
命令:# pvcreate /dev/sda3
结果:Physical volume "/dev/sda3" successfully created
6.查看原VG的情况
命令:vgdisplay
结果:
--- Volume group --- VG Name centos //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
7.扩展卷组,将/dev/sdb物理卷添加到VolGroup卷组中
命令:# vgextend VolGroup /dev/sda3
结果:
Volume group "centos" successfully extended其中,VolGroup就是步骤6中查看得到的VG Name。
再查看VG情况,可以看到VG大小变化,空余空间。
8.查看更改后VG的情况
命令:# vgdisplay
结果:
--- Volume group --- VG Name centos 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
9.将新的VG空间划入LV(扩容lv_root)
命令:# lvextend -L +340G /dev/mapper/centos-root
结果:暂无内容
10.检查/root逻辑卷
命令:# e2fsck -f /dev/mapper/centos-root
结果:暂无内容
11.重新定义分区大小
命令:# resize2fs /dev/mapper/centos-root (非xfs文件系统)
命令:# xfs_growfs /dev/mapper/centos-root (xfs文件系统)
结果:暂无内容
12.查看扩充后的磁盘状态
命令:# df -h
到此为止,我们的扩盘工作已经完成了。
评论暂时关闭