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LVM动态扩容

分类： 系统运维

2017-10-30 11:09:17

前言：
挂载在 / 目录的/dev/mapper/VolGroup-lv_root卷空间不够了，需要扩容。

df -h 查看 / 只有14G 太小了

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 pcre-8.40]# df -h
  2. Filesystem Size Used Avail Use% Mounted on
  3. /dev/mapper/VolGroup-lv_root
  4.                        14G 5.6G 7.3G 44% /
  5. tmpfs 7.8G 0 7.8G 0% /dev/shm
  6. /dev/xvda1 485M 54M 407M 12% /boot
fdisk 查看剩余空间，/dev/xvda 还有一百多G可用

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 pcre-8.40]# fdisk -l

  3. Disk /dev/xvda: 214.7 GB, 214748364800 bytes
  4. 255 heads, 63 sectors/track, 26108 cylinders
  5. Units = cylinders of 16065 * 512 = 8225280 bytes
  6. Sector size (logical/physical): 512 bytes / 512 bytes
  7. I/O size (minimum/optimal): 512 bytes / 512 bytes
  8. Disk identifier: 0x000eacf6

  10.     Device Boot Start End Blocks Id System
  11. /dev/xvda1 * 1 64 512000 83 Linux
  12. Partition 1 does not end on cylinder boundary.
  13. /dev/xvda2 64 1958 15214611 83 Linux

  15. Disk /dev/mapper/VolGroup-lv_root: 14.7 GB, 14722007040 bytes
  16. 255 heads, 63 sectors/track, 1789 cylinders
  17. Units = cylinders of 16065 * 512 = 8225280 bytes
  18. Sector size (logical/physical): 512 bytes / 512 bytes
  19. I/O size (minimum/optimal): 512 bytes / 512 bytes
  20. Disk identifier: 0x00000000


  23. Disk /dev/mapper/VolGroup-lv_swap: 855 MB, 855638016 bytes
  24. 255 heads, 63 sectors/track, 104 cylinders
  25. Units = cylinders of 16065 * 512 = 8225280 bytes
  26. Sector size (logical/physical): 512 bytes / 512 bytes
  27. I/O size (minimum/optimal): 512 bytes / 512 bytes
  28. Disk identifier: 0x00000000
fdisk 创建分区，pvcreate 创建物理卷

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 pcre-8.40]# fdisk /dev/xvda

  3. WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
  4.          switch off the mode (command 'c') and change display units to
  5.          sectors (command 'u').

  7. Command (m for help): m
  8. Command action
  9.    a toggle a bootable flag
  10.    b edit bsd disklabel
  11.    c toggle the dos compatibility flag
  12.    d delete a partition
  13.    l list known partition types
  14.    m print this menu
  15.    n add a new partition
  16.    o create a new empty DOS partition table
  17.    p print the partition table
  18.    q quit without saving changes
  19.    s create a new empty Sun disklabel
  20.    t change a partition's system id
  21.    u change display/entry units
  22.    v verify the partition table
  23.    w write table to disk and exit
  24.    x extra functionality (experts only)

  26. Command (m for help): p

  28. Disk /dev/xvda: 214.7 GB, 214748364800 bytes
  29. 255 heads, 63 sectors/track, 26108 cylinders
  30. Units = cylinders of 16065 * 512 = 8225280 bytes
  31. Sector size (logical/physical): 512 bytes / 512 bytes
  32. I/O size (minimum/optimal): 512 bytes / 512 bytes
  33. Disk identifier: 0x000eacf6

  35.     Device Boot Start End Blocks Id System
  36. /dev/xvda1 * 1 64 512000 83 Linux
  37. Partition 1 does not end on cylinder boundary.
  38. /dev/xvda2 64 1958 15214611 83 Linux

  40. Command (m for help): n
  41. Command action
  42.    e extended
  43.    p primary partition (1-4)
  44. p
  45. Partition number (1-4): 3
  46. First cylinder (1959-26108, default 1959):
  47. Using default value 1959
  48. Last cylinder, +cylinders or +size{K,M,G} (1959-26108, default 26108):
  49. Using default value 26108

  51. Command (m for help): w
  52. The partition table has been

  54. Calling ioctl() to re-read partition table.

  56. WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
  57. The kernel still uses the old table. The new table will be used at
  58. the next reboot or after you run partprobe(8) or kpartx(8)
  59. Syncing disks.

fdisk -l  查看分区

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# fdisk -l

  3. Disk /dev/xvda: 214.7 GB, 214748364800 bytes
  4. 255 heads, 63 sectors/track, 26108 cylinders
  5. Units = cylinders of 16065 * 512 = 8225280 bytes
  6. Sector size (logical/physical): 512 bytes / 512 bytes
  7. I/O size (minimum/optimal): 512 bytes / 512 bytes
  8. Disk identifier: 0x000eacf6

  10.     Device Boot Start End Blocks Id System
  11. /dev/xvda1 * 1 64 512000 83 Linux
  12. Partition 1 does not end on cylinder boundary.
  13. /dev/xvda2 64 1958 15214611 83 Linux
  14. /dev/xvda3 1959 26108 193984875 83 Linux

  16. Disk /dev/mapper/VolGroup-lv_root: 14.7 GB, 14722007040 bytes
  17. 255 heads, 63 sectors/track, 1789 cylinders
  18. Units = cylinders of 16065 * 512 = 8225280 bytes
  19. Sector size (logical/physical): 512 bytes / 512 bytes
  20. I/O size (minimum/optimal): 512 bytes / 512 bytes
  21. Disk identifier: 0x00000000


  24. Disk /dev/mapper/VolGroup-lv_swap: 855 MB, 855638016 bytes
  25. 255 heads, 63 sectors/track, 104 cylinders
  26. Units = cylinders of 16065 * 512 = 8225280 bytes
  27. Sector size (logical/physical): 512 bytes / 512 bytes
  28. I/O size (minimum/optimal): 512 bytes / 512 bytes
  29. Disk identifier: 0x00000000
pvdisplay 查看物理卷

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# pvdisplay
  2.   --- Physical volume ---
  3.   PV Name /dev/xvda2
  4.   VG Name VolGroup
  5.   PV Size 14.51 GiB / not usable 1.02 MiB
  6.   Allocatable yes (but full)
  7.   PE Size 4.00 MiB
  8.   Total PE 3714
  9.   Free PE 0
  10.   Allocated PE 3714
  11.   PV UUID kbUoQF-zSiv-IwgC-3OtP-JbIV-9SXR-oPWJef
vgdisplay 查看逻辑卷组

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# vgdisplay
  2.   --- Volume group ---
  3.   VG Name VolGroup
  4.   System ID
  5.   Format lvm2
  6.   Metadata Areas 1
  7.   Metadata Sequence No 5
  8.   VG Access read/write
  9.   VG Status resizable
  10.   MAX LV 0
  11.   Cur LV 2
  12.   Open LV 2
  13.   Max PV 0
  14.   Cur PV 1
  15.   Act PV 1
  16.   VG Size 14.51 GiB
  17.   PE Size 4.00 MiB
  18.   Total PE 3714
  19.   Alloc PE / Size 3714 / 14.51 GiB
  20.   Free PE / Size 0 / 0
  21.   VG UUID lvi8Kt-MMja-nTvI-terh-7ljb-ImyV-SScwRk

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# vgdisplay
  2.   --- Volume group ---
  3.   VG Name VolGroup
  4.   System ID
  5.   Format lvm2
  6.   Metadata Areas 1
  7.   Metadata Sequence No 5
  8.   VG Access read/write
  9.   VG Status resizable
  10.   MAX LV 0
  11.   Cur LV 2
  12.   Open LV 2
  13.   Max PV 0
  14.   Cur PV 1
  15.   Act PV 1
  16.   VG Size 14.51 GiB
  17.   PE Size 4.00 MiB
  18.   Total PE 3714
  19.   Alloc PE / Size 3714 / 14.51 GiB
  20.   Free PE / Size 0 / 0
  21.   VG UUID lvi8Kt-MMja-nTvI-terh-7ljb-ImyV-SScwRk
lvdispaly 查看逻辑卷

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# lvdisplay
  2.   --- Logical volume ---
  3.   LV Path /dev/VolGroup/lv_root
  4.   LV Name lv_root
  5.   VG Name VolGroup
  6.   LV UUID tYQ8YA-ImhM-NLo8-HgVj-6snL-8qgS-32YBNi
  7.   LV Write Access read/write
  8.   LV Creation host, time localhost.localdomain, 2014-04-08 02:10:19 +0000
  9.   LV Status available
  10.   # open 1
  11.   LV Size 13.71 GiB
  12.   Current LE 3510
  13.   Segments 2
  14.   Allocation inherit
  15.   Read ahead sectors auto
  16.   - currently set to 256
  17.   Block device 253:0
  18.    
  19.   --- Logical volume ---
  20.   LV Path /dev/VolGroup/lv_swap
  21.   LV Name lv_swap
  22.   VG Name VolGroup
  23.   LV UUID PF53Ol-MDZF-nWZb-jJeG-WIHZ-GFQJ-HvKKM5
  24.   LV Write Access read/write
  25.   LV Creation host, time localhost.localdomain, 2014-04-08 02:10:20 +0000
  26.   LV Status available
  27.   # open 1
  28.   LV Size 816.00 MiB
  29.   Current LE 204
  30.   Segments 1
  31.   Allocation inherit
  32.   Read ahead sectors auto
  33.   - currently set to 256
  34.   Block device 253:1
让分区生效
pvcreate 创建物理卷

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# partx -a /dev/xvda
  2. [root@ip-172-30-0-175 ~]# partx -a /dev/xvda3 /dev/xvda
  3. [root@ip-172-30-0-175 ~]# pvcreate /dev/xvda3
  4.   Physical volume "/dev/xvda3" successfully created
  5. [root@ip-172-30-0-175 ~]# pvdisplay
      --- Physical volume ---
      PV Name               /dev/xvda2
      VG Name               VolGroup
      PV Size               14.51 GiB / not usable 1.02 MiB
      Allocatable           yes (but full)
      PE Size               4.00 MiB
      Total PE              3714
      Free PE               0
      Allocated PE          3714
      PV UUID               kbUoQF-zSiv-IwgC-3OtP-JbIV-9SXR-oPWJef
       
      "/dev/xvda3" is a new physical volume of "185.00 GiB"
      --- NEW Physical volume ---
      PV Name               /dev/xvda3
      VG Name               
      PV Size               185.00 GiB
      Allocatable           NO
      PE Size               0   
      Total PE              0
      Free PE               0
      Allocated PE          0
      PV UUID               b7Ykqm-c3ra-sAx7-srWW-kbT6-l4R1-R1cimn
       
将剩余空间都分配给 VolGroup 卷组

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# vgextend VolGroup /dev/xvda3
  2.   Volume group "VolGroup" successfully extended
  3. [root@ip-172-30-0-175 ~]# vgdisplay
      --- Volume group ---
      VG Name               VolGroup
      System ID             
      Format                lvm2
      Metadata Areas        2
      Metadata Sequence No  6
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                2
      Open LV               2
      Max PV                0
      Cur PV                2
      Act PV                2
      VG Size               199.50 GiB
      PE Size               4.00 MiB
      Total PE              51073
      Alloc PE / Size       3714 / 14.51 GiB
      Free  PE / Size       47359 / 185.00 GiB
      VG UUID               lvi8Kt-MMja-nTvI-terh-7ljb-ImyV-SScwRk

将卷组中的剩余空间都分配给/dev/VolGroup/lv_root 逻辑卷

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# lvextend -l +100%FREE /dev/VolGroup/lv_root
  2.   Extending logical volume lv_root to 198.71 GiB
  3.   Logical volume lv_root successfully resized
调整分区大小 resize2fs   /dev/mapper/VolGroup-lv_root

点击(此处)折叠或打开

  1. [root@ip-172-30-0-175 ~]# resize2fs /dev/mapper/VolGroup-lv_root
  2. resize2fs 1.41.12 (17-May-2010)
  3. Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required
  4. old desc_blocks = 1, new_desc_blocks = 13
  5. Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 52089856 (4k) blocks.
  6. The filesystem on /dev/mapper/VolGroup-lv_root is now 52089856 blocks long.
  7. [root@ip-172-30-0-175 ~]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root
                          196G  5.6G  181G   3% /
    tmpfs                 7.8G     0  7.8G   0% /dev/shm
    /dev/xvda1            485M   54M  407M  12% /boot

可以看到 /dev/mapper/VolGroup-lv_root 的大小由14G变成196G了。








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