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标题: LVM_扩大根分区 [打印本页]

作者: admin 时间: 2019-9-5 14:58 标题: 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@localhost ~]# vgdisplay --- Volume group --- VG Name VolGroup 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 99.51 GiB PE Size 4.00 MiB Total PE 25474 Alloc PE / Size 25474 / 99.51 GiB Free PE / Size 0 / 0 VG UUID o0Udpv-BvUO-R3n2-BpAE-QvWx-pfzf-JA83jC 交换分区、根分区默认就使用了逻辑卷： [root@localhost ~]# lvdisplay --- Logical volume --- LV Path /dev/VolGroup/lv_root LV Name lv_root VG Name VolGroup LV UUID JA8Vxw-hPXh-yW2t-XOon-5vqj-uuUy-4QaW4s LV Write Access read/write LV Creation host, time localhost.localdomain, 2018-07-05 04:34:18 +0800 LV Status available # open 1 LV Size 95.51 GiB Current LE 24450 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Path /dev/VolGroup/lv_swap LV Name lv_swap VG Name VolGroup LV UUID UYnjVa-nCqs-hTN1-1ZbV-3z2L-lpGs-Inh1oW LV Write Access read/write LV Creation host, time localhost.localdomain, 2018-07-05 04:34:24 +0800 LV Status available # open 1 LV Size 4.00 GiB Current LE 1024 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 查看根分区所使用的逻辑卷： [root@localhost ~]# lvdisplay /dev/VolGroup/lv_root --- Logical volume --- LV Path /dev/VolGroup/lv_root LV Name lv_root VG Name VolGroup LV UUID JA8Vxw-hPXh-yW2t-XOon-5vqj-uuUy-4QaW4s LV Write Access read/write LV Creation host, time localhost.localdomain, 2018-07-05 04:34:18 +0800 LV Status available # open 1 LV Size 95.51 GiB Current LE 24450 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 图片1.png

############ 扩大根分区虚拟机添加一块硬盘：图片3.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/sdb 图片4.png

创建物理卷： [root@localhost ~]# pvcreate /dev/sdb Physical volume "/dev/sdb" successfully created 扩大卷组： [root@localhost ~]# vgextend VolGroup /dev/sdb Volume group "VolGroup" successfully extended [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 129.50 GiB PE Size 4.00 MiB Total PE 33153 Alloc PE / Size 25474 / 99.51 GiB Free PE / Size 7679 / 30.00 GiB VG UUID o0Udpv-BvUO-R3n2-BpAE-QvWx-pfzf-JA83jC 扩展逻辑卷（不能把空间全部分完，要留0.1G！） [root@localhost ~]# lvextend -L +29.9G /dev/VolGroup/lv_root Rounding size to boundary between physical extents: 29.90 GiB. Size of logical volume VolGroup/lv_root changed from 95.51 GiB (24450 extents) to 125.41 GiB (32105 extents). Logical volume lv_root successfully resized. 逻辑卷扩展成功： [root@localhost ~]# lvdisplay /dev/VolGroup/lv_root --- Logical volume --- LV Path /dev/VolGroup/lv_root LV Name lv_root VG Name VolGroup LV UUID JA8Vxw-hPXh-yW2t-XOon-5vqj-uuUy-4QaW4s LV Write Access read/write LV Creation host, time localhost.localdomain, 2018-07-05 04:34:18 +0800 LV Status available # open 1 LV Size 125.41 GiB Current LE 32105 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 重建EXT4文件系统： [root@localhost ~]# resize2fs /dev/VolGroup/lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required old desc_blocks = 6, new_desc_blocks = 8 Performing an on-line resize of /dev/VolGroup/lv_root to 32875520 (4k) blocks. The filesystem on /dev/VolGroup/lv_root is now 32875520 blocks long. 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： CentOS8_LVM_扩大根分区

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