CentOS7使用lvm动态添加磁盘到逻辑卷/data (适用xfs文件系统)

系统的文件系统类型如下：

[root@tomas121 ~]# df -hT
Filesystem                       Type      Size   Used Avail Use% Mounted on
/dev/mapper/centos_tomas121-root xfs         50G   1.4G   49G  3% /
devtmpfs                         devtmpfs   32G     0   32G   0% /dev
tmpfs                             tmpfs      32G     0   32G   0% /dev/shm
tmpfs                             tmpfs      32G   58M   32G   1% /run
tmpfs                           tmpfs      32G     0   32G   0% /sys/fs/cgroup
/dev/mapper/centos_tomas121-data xfs       481G   200G  282G   42% /data
/dev/sda1                         xfs       497M   125M  373M   26% /boot
tmpfs                             tmpfs     6.3G     0  6.3G   0% /run/user/0

系统一分配的逻辑卷如下：

[root@tomas121 ~]# cd /dev/centos_tomas121/
[root@tomas121 centos_tomas121]# ls
data  root  swap

1.1、fdisk -l#查看磁盘

[root@tomas121 ~]# fdisk -l


Disk /dev/sda: 300.0 GB, 300000000000 bytes, 585937500 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: 0x00027686


   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048   585814015   292393984   8e  Linux LVM


Disk /dev/sdb: 300.0 GB, 300000000000 bytes, 585937500 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


#上面显示/dev/sdb 为新增磁盘
1.2、pvcreate /dev/sdb #创建物理卷，将新增磁盘加入到物理卷
[root@tomas121 centos_tomas121]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created


[root@tomas121 centos_tomas121]# pvs #查看物理卷
  PV         VG              Fmt  Attr PSize   PFree  
  /dev/sda2  centos_tomas121 lvm2 a--  278.85g      0 
  /dev/sdb                   lvm2 ---  279.40g 279.40g


[root@tomas121 centos_tomas121]# pvdisplay #查看物理卷信息
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos_tomas121
  PV Size               278.85 GiB / not usable 0   
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              71385
  Free PE               0
  Allocated PE          71385
  PV UUID               6fedHJ-uBvR-AeRq-PcEn-UK9n-aKu5-B1E3UB
   
  "/dev/sdb" is a new physical volume of "279.40 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb
  VG Name               
  PV Size               279.40 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               ZVnShK-YjZa-RADS-fYiL-rZX5-Y4BT-vT6Szl
  
1.3、vgextend centos_tomas121 /dev/sdb #扩展卷组centos_tomas121，即将PV加入卷组（VG）
[root@tomas121 centos_tomas121]# vgextend centos_tomas121 /dev/sdb
  Volume group "centos_tomas121" successfully extended


[root@tomas121 centos_tomas121]# pvs #查看物理卷
  PV         VG              Fmt  Attr PSize   PFree  
  /dev/sda2  centos_tomas121 lvm2 a--  278.85g      0 
  /dev/sdb   centos_tomas121 lvm2 a--  279.39g 279.39g
[root@tomas121 centos_tomas121]# pvdisplay #查看物理卷信息
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos_tomas121
  PV Size               278.85 GiB / not usable 0   
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              71385
  Free PE               0
  Allocated PE          71385
  PV UUID               6fedHJ-uBvR-AeRq-PcEn-UK9n-aKu5-B1E3UB
   
  --- Physical volume ---
  PV Name               /dev/sdb
  VG Name               centos_tomas121
  PV Size               279.40 GiB / not usable 2.29 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              71525
  Free PE               71525
  Allocated PE          0
  PV UUID               ZVnShK-YjZa-RADS-fYiL-rZX5-Y4BT-vT6Szl


1.4、vgdisplay #查看卷组信息
[root@tomas121 centos_tomas121]# vgdisplay
  --- Volume group ---
  VG Name               centos_tomas121
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               558.24 GiB
  PE Size               4.00 MiB
  Total PE              142910
  Alloc PE / Size       71385 / 278.85 GiB
  Free  PE / Size       71525 / 279.39 GiB
  VG UUID               Cn4INa-4uP4-QXvk-qQEH-Z67P-0Rl6-1xaccU


1.5、lvextend -L +279.39G /dev/centos_tomas121/data #将原/data逻辑卷的大小增加279.39G
[root@tomas121 centos_tomas121]# lvextend -L +279.39G /dev/centos_tomas121/data 
  Rounding size to boundary between physical extents: 279.39 GiB
  Size of logical volume centos_tomas121/data changed from 200.91 GiB (51432 extents) to 480.30 GiB (122956 extents).
  Logical volume data successfully resized.


[root@tomas121 ~]# df -hP|grep /data #查看/data目录的磁盘空间大小
/dev/mapper/centos_tomas121-data  201G  199G  1.9G 100% /data
  
1.6、xfs_growfs /dev/centos_tomas121/data #执行扩容调整，将文件系统增到逻辑卷的大小
[root@tomas121 centos_tomas121]# xfs_growfs /dev/centos_tomas121/data 
meta-data=/dev/mapper/centos_tomas121-data isize=256    agcount=4, agsize=13166592 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=52666368, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=25716, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 52666368 to 125906944


#对原/data逻辑卷进行扩容后，再次查看/data目录的磁盘空间大小
[root@tomas121 ~]# df -hP|grep /data #查看/data目录的磁盘空间大小
/dev/mapper/centos_tomas121-data  481G  199G  282G  42% /data

参考：

http://blog.csdn.net/kjsayn/article/details/52996313

http://www.linuxidc.com/Linux/2016-06/132709.htm

http://jingyan.baidu.com/article/0f5fb099131f306d8234ea53.html

http://www.cnblogs.com/jenqz/p/4929871.html

http://www.cnblogs.com/kevingrace/p/5825963.html

http://www.cnblogs.com/kysnail/archive/2012/03/25/2417221.html