KVM之XFS磁盘扩容

1、前言

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。