centos KVM之XFS磁盘扩容

1、前言

被控磁盘扩容

/dev/loop1 30G 26G 4.1G 87% /var/ftp/pub

根据目前我们使用的需求，以前规划的100G磁盘空间不够，这里将演示XFS文件系统的扩容，因为我使用的是KVM所以也会演示KVM的扩容方式。

2、KVM磁盘扩容

扩容前一定要先备份，或者做快照，不要造成数据的损坏。

[root@vm-node-1 img]# qemu-img info c7_data_g2.raw #<--查看原磁盘信息

image: c7_data_g2.raw

file format: raw

virtual size: 100G (107374182400 bytes)

disk size: 100G

[root@vm-node-1 img]# qemu-img resize c7_data_g2.raw +200G #<--增加200G

Image resized.

[root@vm-node-1 img]# qemu-img info c7_data_g2.raw

image: c7_data_g2.raw

file format: raw

virtual size: 300G (322122547200 bytes) #<--增加成功

disk size: 100G

修改完成，需要重启KVM虚拟机生效

3、重启KVM主机

[root@vm-node-1 ~]# virsh shutdown kvm-node-1

域 kvm-node-1 被关闭

[root@dsd ~]# virsh start kvm-node-1

域 kvm-node-1 已开始

4、XFS磁盘扩容

第一步： 摘下磁盘

[root@kvm-node-1 ~]# umount /data

[root@kvm-node-1 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sr0 11:0 1 1024M 0 rom

vda 253:0 0 40G 0 disk

└─vda1 253:1 0 40G 0 part /

vdb 253:16 0 300G 0 disk

└─vdb1 253:17 0 100G 0 part

第二步：调整分区表大小

调整分区表大小不会真正去修改数据，类似于重新修订书籍的目录； 注意起始位置要一致，我这里用默认即可；默认是2048开始，所以我直接回车就行

[root@kvm-node-1 ~]# fdisk /dev/vdb

Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only,until you decide to write them.

Be careful before using the write command.

Command (m for help): p #<-- 打印分区信息

Disk /dev/vdb: 322.1 GB,322122547200 bytes,629145600 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x60f8f320

Device Boot Start End Blocks Id System

/dev/vdb1 2048 209715199 104856576 83 Linux

Command (m for help): d #<-- 删除分区

Selected partition 1

Partition 1 is deleted

Command (m for help): n #<-- 创建分区， 剩下的基本就是一路回车了

Partition type:

p primary (0 primary,0 extended,4 free)

e extended

Select (default p): p

Partition number (1-4,default 1): 1

First sector (2048-629145599,default 2048):

Using default value 2048

Last sector,+sectors or +size{K,M,G} (2048-629145599,default 629145599):

Using default value 629145599

Partition 1 of type Linux and of size 300 GiB is set

Command (m for help): wq #<-- 保存分区信息

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

第三步：在线扩容

[root@kvm-node-1 ~]# xfs_growfs /dev/vdb1

meta-data=/dev/vdb1 isize=512 agcount=4,agsize=6553536 blks

= sectsz=512 attr=2,projid32bit=1

= crc=1 finobt=0 spinodes=0

data = bsize=4096 blocks=26214144,imaxpct=25

= sunit=0 swidth=0 blks

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

log =internal bsize=4096 blocks=12799,version=2

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

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

data blocks changed from 26214144 to 78642944

[root@kvm-node-1 ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/vda1 40G 2.3G 38G 6% /

devtmpfs 12G 0 12G 0% /dev

tmpfs 12G 0 12G 0% /dev/shm

tmpfs 12G 8.5M 12G 1% /run

tmpfs 12G 0 12G 0% /sys/fs/cgroup

tmpfs 2.4G 0 2.4G 0% /run/user/0

/dev/vdb1 300G 100G 201G 34% /data

在测试发现，XFS文件系统如果没有挂载进行扩容，则会提示不是一个xfs文件系统。