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标题: CentOS8_LVM_扩大根分区 [打印本页]

作者: admin 时间: 2019-9-10 16:17 标题: CentOS8_LVM_扩大根分区

LVM是Linux系统中对磁盘分区进行管理的一种逻辑机制，它是建立在硬盘和分区之上、文件系统之下的一个逻辑层，在建立文件系统时屏蔽了下层的磁盘分区布局，能够在保持现有数据不变的情况下动态调整磁盘容量，从而提高磁盘管理的灵活性。其实系统默认就有这个卷组： [root@centos8 ~]# vgdisplay --- Volume group --- VG Name cl 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 79.80 GiB PE Size 4.00 MiB Total PE 20429 Alloc PE / Size 20429 / 79.80 GiB Free PE / Size 0 / 0 VG UUID cAD3Mx-cHvj-jP05-dnHd-KpTj-z9Nd-VbFrbI 交换分区、根分区默认就使用了逻辑卷： [root@centos8 ~]# lvdisplay --- Logical volume --- LV Path /dev/cl/swap LV Name swap VG Name cl LV UUID obone0-20nl-Txhr-l6Vq-HadV-dCXD-RHpp3P LV Write Access read/write LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:40 +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 8192 Block device 253:1 --- Logical volume --- LV Path /dev/cl/root LV Name root VG Name cl LV UUID wuM8ey-9lxk-XAqv-U6hF-aQwY-oeOq-1ipcow LV Write Access read/write LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:41 +0800 LV Status available # open 1 LV Size 75.80 GiB Current LE 19405 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 查看根分区所使用的逻辑卷： [root@centos8 ~]# lvdisplay /dev/cl/root --- Logical volume --- LV Path /dev/cl/root LV Name root VG Name cl LV UUID wuM8ey-9lxk-XAqv-U6hF-aQwY-oeOq-1ipcow LV Write Access read/write LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:41 +0800 LV Status available # open 1 LV Size 75.80 GiB Current LE 19405 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 图片1.png

############ 扩大根分区虚拟机添加一块硬盘：图片2.png

备注：服务器重启后，才能识别新硬盘。查看第二块硬盘的分区情况： fdisk -l /dev/nvme0n2 图片3.png

创建物理卷： [root@centos8 ~]# pvcreate /dev/nvme0n2 Physical volume "/dev/nvme0n2" successfully created. 扩大卷组： [root@centos8 ~]# vgextend cl /dev/nvme0n2 Volume group "cl" successfully extended 卷组扩大成功了 [root@centos8 ~]# vgdisplay --- Volume group --- VG Name cl 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 <109.80 GiB PE Size 4.00 MiB Total PE 28108 Alloc PE / Size 20429 / 79.80 GiB Free PE / Size 7679 / <30.00 GiB VG UUID cAD3Mx-cHvj-jP05-dnHd-KpTj-z9Nd-VbFrbI 扩展逻辑卷（不能把空间全部分完，要留0.1G！） [root@centos8 ~]# lvextend -L +29.9G /dev/cl/root Rounding size to boundary between physical extents: 29.90 GiB. Size of logical volume cl/root changed from 75.80 GiB (19405 extents) to 105.70 GiB (27060 extents). Logical volume cl/root successfully resized. 逻辑卷扩展成功： [root@centos8 ~]# lvdisplay /dev/cl/root --- Logical volume --- LV Path /dev/cl/root LV Name root VG Name cl LV UUID wuM8ey-9lxk-XAqv-U6hF-aQwY-oeOq-1ipcow LV Write Access read/write LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:41 +0800 LV Status available # open 1 LV Size 105.70 GiB Current LE 27060 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 刷新xfs文件系统： [root@centos8 ~]# xfs_growfs / 图片4.png

注释：逻辑卷/dev/cl/root挂载在根分区。根分区扩展成功：图片5.png

备注：根分区扩展无需重启系统；重启系统后，系统也正常。相关文章： CentOS6_LVM_扩大根分区 CentOS7.8扩大/var分区 ################################# ################################# 亲，学习研究也要劳逸结合哦，来我微店逛逛，买点东西好好犒劳犒劳自己和家人吧^_^^_^ 永定泡鸭爪400g礼包福建土楼客家特产卤味微辣鸭掌闽西好【满49包邮偏远除外】

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