CentOS6 Linux 扩展/dev/mapper/VolGroup-lv_root容量
在Liunx上安装MySQL8时，提示磁盘空间不足，这里记录一下CentOS6磁盘空间不足，扩展磁盘空间（/dev/mapper/VolGroup-lv_root）的过程。
查看磁盘空间（lv_root），目的扩容是：lv_root
[root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 6.7G 5.8G 543M 92% / tmpfs 16G 0 16G 0% /dev/shm /dev/vda1 485M 39M 421M 9% /boot /dev/vdb1 9.7G 151M 9.1G 2% /apps /dev/vdb2 9.7G 752M 8.5G 8% /usr/local /dev/vdb3 40G 829M 37G 3% /home/lundao/apps /dev/vdb4 40G 177M 38G 1% /var/lib/mysql
查看卷组信息： vgdisplay
[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 7.51 GiB PE Size 4.00 MiB Total PE 1922 Alloc PE / Size 1922 / 7.51 GiB Free PE / Size 0 / 0 VG UUID py9kYy-tKAO-dsMk-BnJf-YRVr-aaZ1-Il9FCc [root@localhost]# vgdisplay VolGroup --- 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 7.51 GiB PE Size 4.00 MiB Total PE 1922 Alloc PE / Size 1922 / 7.51 GiB Free PE / Size 0 / 0 VG UUID py9kYy-tKAO-dsMk-BnJf-YRVr-aaZ1-Il9FCc
新建物理卷(PV)：pvcreate /dev/vdb1
[root@localhost]# pvcreate /dev/vdb1 Physical volume "/dev/vdb1" successfully created pvdisplay pvdisplay /dev/vdb1
查看新建的物理卷和大小： pvdisplay /dev/vdb1
[root@localhost]# pvdisplay /dev/vdb1 "/dev/vdb1" is a new physical volume of "9.84 GiB" --- NEW Physical volume --- PV Name /dev/vdb1 VG Name PV Size 9.84 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID UmoxEA-hn8Y-7Wz4-bBbt-dJrO-AbcB-WZyWDk
扩展卷组(VG)：vgextend VolGroup /dev/vdb1
添加新的物理卷到lv_root同一个卷组。
[root@localhost]# vgextend VolGroup /dev/vdb1 Volume group "VolGroup" successfully extended
查看卷组信息：
[root@localhost]# vgdisplay VolGroup --- 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 17.35 GiB PE Size 4.00 MiB Total PE 4441 Alloc PE / Size 1922 / 7.51 GiB Free PE / Size 2519 / 9.84 GiB VG UUID py9kYy-tKAO-dsMk-BnJf-YRVr-aaZ1-Il9FCc
增加lv_root的大小，增加5G：lvresize -L +5G /dev/mapper/VolGroup-lv_root
[root@localhost]# lvresize -L +5G /dev/mapper/VolGroup-lv_root Extending logical volume lv_root to 11.71 GiB Logical volume lv_root successfully resized
重新识别大小， xfs_qrowfs 是centos7的命令，在centos6.X中是resize2fs
[root@localhost]# resize2fs -p /dev/mapper/VolGroup-lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 3069952 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_root is now 3069952 blocks long.
resize2fs -p /dev/mapper/VolGroup-lv_root
查看磁盘空间
Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 12G 4.6G 6.4G 42% / tmpfs 16G 0 16G 0% /dev/shm /dev/vda1 485M 39M 421M 9% /boot /dev/vdb2 9.7G 1.8G 7.5G 20% /usr/local /dev/vdb3 40G 1.8G 36G 5% /home/lundao/apps /dev/vdb4 40G 176M 38G 1% /var/lib/mysql
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