「小技巧」虚拟机硬盘增加空间 虚拟机的硬盘怎么扩容

扩容前

df -h

Filesystem Size Used Avail Use% Mounted on

devtmpfs 7.9G 0 7.9G 0% /dev

tmpfs 7.9G 16M 7.9G 1% /dev/shm

tmpfs 7.9G 840M 7.1G 11% /run

tmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup

/dev/mapper/vg_root-lv_root 50G 4.3G 46G 9% /

/dev/sda1 1014M 206M 809M 21% /boot

/dev/mapper/vg_root-lv_var 10G 2.0G 8.1G 20% /var

/dev/mapper/vg_data-lv_data 4.0T 3.6T 300G 90% /data

在vcenter或者vmware给虚拟机添加新的硬盘后，查看是否存在

1、fdisk -l 查找新加的硬盘 ，一般是最后一个

格式化硬盘 fdisk /dev/sdd

先按n创建，再选择 p 创建主分区，其他回车默认

2、给新加的硬盘创建分区

parted /dev/sdd

GNU Parted 3.1

Using /dev/sdd

Welcome to GNU Parted! Type 'help' to view a list of commands.

给创建的分区指定分区表

(parted) mklabel msdos (这里按照原系统有的的硬盘格式来做)

Warning: The existing disk label on /dev/sdd will be destroyed and all data on this disk will be lost. Do you want to continue?

Yes/No? yes

(parted) quit

Information: You may need to update /etc/fstab. 如果是给新的分区挂载，需要加到/etc/fstab自启

3、将物理硬盘分区初始化为物理卷，以便LVM使用

pvcreate /dev/sdd

查看卷组

[root@DB1 postgresql]# lvdisplay

--- Logical volume ---

LV Path /dev/vg_data/lv_data

LV Name lv_data

VG Name vg_data

LV UUID FjYXcv-0F3W-uMny-OG71-fHll-gM7p-slrsvL

LV Write Access read/write

LV Creation host, time ZABBIX1, 2020-09-27 20:15:09 +0800

卷组拓展，把 /dev/sdd 加到 vg_data组

root@DB1 ~]# vgextend vg_data /dev/sdd

Volume group "vg_data" successfully extended

分区拓展，把 /dev/sdd的空间拓展到 /dev/vg_data/lv_data 分区

[root@DB1 ~]# lvextend /dev/vg_data/lv_data /dev/sdd

Size of logical volume vg_data/lv_data changed from <6.00 TiB (1572861 extents) to <8.00 TiB (2097148 extents).

Logical volume vg_data/lv_data successfully resized.

4、执行扩容命令

[root@DB1 ~]# xfs_growfs /dev/vg_data/lv_data

meta-data=/dev/mapper/vg_data-lv_data isize=512 agcount=9, agsize=134152192 blks

= sectsz=512 attr=2, projid32bit=1

= crc=1 finobt=0 spinodes=0

data = bsize=4096 blocks=1073739776, imaxpct=5

= sunit=0 swidth=0 blks

naming =version 2 bsize=4096 ascii-ci=0 ftype=1

log =internal bsize=4096 blocks=262016, version=2

= sectsz=512 sunit=0 blks, lazy-count=1

realtime =none extsz=4096 blocks=0, rtextents=0

data blocks changed from 1073739776 to 1610609664

5、查看扩容结果

df -h

Filesystem Size Used Avail Use% Mounted on

devtmpfs 7.9G 0 7.9G 0% /dev

tmpfs 7.9G 16M 7.9G 1% /dev/shm

tmpfs 7.9G 840M 7.1G 11% /run

tmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup

/dev/mapper/vg_root-lv_root 50G 4.3G 46G 9% /

/dev/sda1 1014M 206M 809M 21% /boot

/dev/mapper/vg_root-lv_var 10G 2.0G 8.1G 20% /var

/dev/mapper/vg_data-lv_data 6.0T 3.6T 2.5T 60% /data