一，Centos为硬盘新增容量分区并挂载到根目录

1.查看硬盘的情况。
image.png
可以看到硬盘新增了大小，但是没有被用起来。
下面我要做的其实就是lvm扩展

  1. [root@Slave2 ~]# fdisk /dev/sda
  2. Welcome to fdisk (util-linux 2.23.2).
  4. Changes will remain in memory only, until you decide to write them.
  5. Be careful before using the write command.
  8. Command (m for help): p
  10. Disk /dev/sda: 429.5 GB, 429496729600 bytes, 838860800 sectors
  11. Units = sectors of 1 * 512 = 512 bytes
  12. Sector size (logical/physical): 512 bytes / 512 bytes
  13. I/O size (minimum/optimal): 512 bytes / 512 bytes
  14. Disk label type: dos
  15. Disk identifier: 0x0001784c
  17.    Device Boot      Start         End      Blocks   Id  System
  18. /dev/sda1   *        2048     2099199     1048576   83  Linux
  19. /dev/sda2         2099200    33554431    15727616   8e  Linux LVM
  21. Command (m for help): n
  22. Partition type:
  23.    p   primary (2 primary, 0 extended, 2 free)
  24.    e   extended
  25. Select (default p): p
  26. Partition number (3,4, default 3): 3
  27. First sector (33554432-838860799, default 33554432): 33554432
  28. Last sector, +sectors or +size{K,M,G} (33554432-838860799, default 838860799): 838860799
  29. Partition 3 of type Linux and of size 384 GiB is set
  31. Command (m for help): p
  33. Disk /dev/sda: 429.5 GB, 429496729600 bytes, 838860800 sectors
  34. Units = sectors of 1 * 512 = 512 bytes
  35. Sector size (logical/physical): 512 bytes / 512 bytes
  36. I/O size (minimum/optimal): 512 bytes / 512 bytes
  37. Disk label type: dos
  38. Disk identifier: 0x0001784c
  40.    Device Boot      Start         End      Blocks   Id  System
  41. /dev/sda1   *        2048     2099199     1048576   83  Linux
  42. /dev/sda2         2099200    33554431    15727616   8e  Linux LVM
  43. /dev/sda3        33554432   838860799   402653184   83  Linux
  45. Command (m for help): w
  46. The partition table has been altered!
  48. Calling ioctl() to re-read partition table.
  50. WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
  51. The kernel still uses the old table. The new table will be used at
  52. the next reboot or after you run partprobe(8) or kpartx(8)
  53. Syncing disks.
  54. [root@Slave2 ~]#

用 partprobe /dev/sda3 没有启作用，重启后生效
image.png
image.png
可以看到sda3为刚刚新增的分区。
开始扩容：
创建物理卷：

  1. [root@Slave2 ~]# lvm
  2. lvm> pvcreate /dev/sda3
  3.   Physical volume "/dev/sda3" successfully created.
  4. lvm>

查看物理卷和卷组：

  1. lvm> pvdisplay
  2.   --- Physical volume ---
  3.   PV Name               /dev/sda2
  4.   VG Name               centos
  5.   PV Size               <15.00 GiB / not usable 3.00 MiB
  6.   Allocatable           yes (but full)
  7.   PE Size               4.00 MiB
  8.   Total PE              3839
  9.   Free PE               0
  10.   Allocated PE          3839
  11.   PV UUID               VZ9vj7-442j-SGbv-3ZRj-gdDs-kQuK-YIPcEj
  13.   "/dev/sda3" is a new physical volume of "384.00 GiB"
  14.   --- NEW Physical volume ---
  15.   PV Name               /dev/sda3
  16.   VG Name               
  17.   PV Size               384.00 GiB
  18.   Allocatable           NO
  19.   PE Size               0   
  20.   Total PE              0
  21.   Free PE               0
  22.   Allocated PE          0
  23.   PV UUID               TRQMxO-ouRd-E4GM-mL60-R4Ub-3FsX-BjiXZF
  25. lvm>

将物理卷加入到卷组：

  1. lvm> vgextend centos /dev/sda3
  2.   Volume group "centos" successfully extended
  3. lvm> vgdisplay
  4.   --- Volume group ---
  5.   VG Name               centos
  6.   System ID             
  7.   Format                lvm2
  8.   Metadata Areas        2
  9.   Metadata Sequence No  4
  10.   VG Access             read/write
  11.   VG Status             resizable
  12.   MAX LV                0
  13.   Cur LV                2
  14.   Open LV               2
  15.   Max PV                0
  16.   Cur PV                2
  17.   Act PV                2
  18.   VG Size               398.99 GiB
  19.   PE Size               4.00 MiB
  20.   Total PE              102142
  21.   Alloc PE / Size       3839 / <15.00 GiB
  22.   Free  PE / Size       98303 / <384.00 GiB
  23.   VG UUID               e6v5QC-dUMm-yUWn-KSy7-5eOx-ttq6-5eyDID
  25. lvm>

将卷组剩余空间添加到逻辑卷组/dev/centos/root

  1. lvm> lvextend -l +100%FREE /dev/centos/root
  2.   Size of logical volume centos/root changed from 13.39 GiB (3429 extents) to 397.39 GiB (101732 extents).
  3.   Logical volume centos/root successfully resized.
  4. lvm>

同步到文件系统

  1. lvm> exit
  2.   Exiting.
  3. [root@Slave2 ~]# xfs_growfs /dev/centos/root
  4. meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=877824 blks
  5.          =                       sectsz=512   attr=2, projid32bit=1
  6.          =                       crc=1        finobt=0 spinodes=0
  7. data     =                       bsize=4096   blocks=3511296, imaxpct=25
  8.          =                       sunit=0      swidth=0 blks
  9. naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
  10. log      =internal               bsize=4096   blocks=2560, version=2
  11.          =                       sectsz=512   sunit=0 blks, lazy-count=1
  12. realtime =none                   extsz=4096   blocks=0, rtextents=0
  13. data blocks changed from 3511296 to 104173568
  14. [root@Slave2 ~]# df -h
  15. Filesystem               Size  Used Avail Use% Mounted on
  16. devtmpfs                 7.8G     0  7.8G   0% /dev
  17. tmpfs                    7.8G     0  7.8G   0% /dev/shm
  18. tmpfs                    7.8G  8.8M  7.8G   1% /run
  19. tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
  20. /dev/mapper/centos-root  398G  9.9G  388G   3% /
  21. /dev/sda1               1014M  150M  865M  15% /boot
  22. tmpfs                    1.6G     0  1.6G   0% /run/user/0
  23. [root@Slave2 ~]#