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邏輯捲軸管理

  1. 縮小LV及掛載檔案系統大小
    [root@instructor ~]# umount /dev/dywvg/dywlv
    [root@instructor ~]# resize2fs -f /dev/dywvg/dywlv 900M
    resize2fs 1.41.12 (17-May-2010)
    Resizing the filesystem on /dev/dywvg/dywlv to 230400 (4k) blocks.
    The filesystem on /dev/dywvg/dywlv is now 230400 blocks long.
    
    [root@instructor ~]# fsck /dev/mapper/dywvg-dywlv 
    fsck from util-linux-ng 2.17.2
    e2fsck 1.41.12 (17-May-2010)
    /dev/mapper/dywvg-dywlv: clean, 2956/79680 files, 22474/311296 blocks
    
    [root@instructor ~]# lvresize -L 900M /dev/dywvg/dywlv 
      Rounding up size to full physical extent 928.00 MiB
      WARNING: Reducing active logical volume to 928.00 MiB
      THIS MAY DESTROY YOUR DATA (filesystem etc.)
    Do you really want to reduce dywlv? [y/n]: y
      Reducing logical volume dywlv to 928.00 MiB
      Logical volume dywlv successfully resized
    [root@instructor ~]# mount /dev/dywvg/dywlv /mnt/dywlvm/
    [root@instructor ~]# df -h /mnt/dywlvm/
    Filesystem                 Size  Used Avail Use% Mounted on
    /dev/mapper/dywvg-dywlv    885M   68M  776M   9% /mnt/dywlvm
    [root@instructor ~]# ll /mnt/dywlvm/
    total 16
    drwxr-xr-x. 125 root root 12288 Jul 11 08:17 etc
    drwx------.   2 root root  4096 Jul 10 21:45 lost+found
    
  2. 放大LV及掛載檔案系統大小
    [root@instructor ~]# lvresize -L 1200M /dev/dywvg/dywlv 
      Rounding up size to full physical extent 1.19 GiB
      Extending logical volume dywlv to 1.19 GiB
      Logical volume dywlv successfully resized
    [root@instructor ~]# resize2fs -f /dev/dywvg/dywlv
    resize2fs 1.41.12 (17-May-2010)
    Filesystem at /dev/dywvg/dywlv is mounted on /mnt/dywlvm; on-line resizing required
    old desc_blocks = 1, new_desc_blocks = 1
    Performing an on-line resize of /dev/dywvg/dywlv to 311296 (4k) blocks.
    The filesystem on /dev/dywvg/dywlv is now 311296 blocks long.
    
    [root@instructor ~]# df -h /mnt/dywlvm/
    Filesystem               Size  Used Avail Use% Mounted on
    /dev/mapper/dywvg-dywlv  1.2G   69M  1.1G   6% /mnt/dywlvm
    [root@instructor ~]# ll /mnt/dywlvm/
    total 16
    drwxr-xr-x. 125 root root 12288 Jul 11 08:17 etc
    drwx------.   2 root root  4096 Jul 10 21:45 lost+found
    
  3. 以 lvresize 指令一次完成放大或縮小。 特別注意﹗lv 放大縮小應先卸載,但根目錄無法卸載,且 lvm 相關命令在 /sbin 目錄下,直接將掛載根目錄 / 的分割區,做放大縮小,風險非常高,可能造成資料的損壞。
    [root@kvm8 ~]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/vg_kvmusb-root
                          1.1G  708M  321M  69% /
    tmpfs                 499M     0  499M   0% /dev/shm
    /dev/vda1              93M   26M   63M  29% /boot
    /dev/mapper/vg_kvmhome-vo
                           20M  4.6M   14M  25% /home
    [root@kvm8 ~]# lvresize -L 90M -r /dev/mapper/vg_kvmhome-vo 
    fsck from util-linux-ng 2.17.2
    e2fsck 1.41.12 (17-May-2010)
    /dev/mapper/vg_kvmhome-vo is mounted.  
    
    WARNING!!!  The filesystem is mounted.   If you continue you ***WILL***
    cause ***SEVERE*** filesystem damage.
    
    Do you really want to continue (y/n)? yes
    
    /dev/mapper/vg_kvmhome-vo: recovering journal
    /dev/mapper/vg_kvmhome-vo: clean, 11/6144 files, 5404/20480 blocks
      Extending logical volume vo to 90.00 MiB
      Logical volume vo successfully resized
    resize2fs 1.41.12 (17-May-2010)
    Filesystem at /dev/dm-2 is mounted on /home; on-line resizing required
    old desc_blocks = 1, new_desc_blocks = 1
    Performing an on-line resize of /dev/dm-2 to 92160 (1k) blocks.
    The filesystem on /dev/dm-2 is now 92160 blocks long.
    
    [root@kvm8 ~]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/vg_kvmusb-root
                          1.1G  708M  321M  69% /
    tmpfs                 499M     0  499M   0% /dev/shm
    /dev/vda1              93M   26M   63M  29% /boot
    /dev/mapper/vg_kvmhome-vo
                           87M  5.6M   78M   7% /home
    [root@kvm8 ~]# umount /dev/mapper/vg_kvmhome-vo 
    [root@kvm8 ~]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/vg_kvmusb-root
                          1.1G  708M  321M  69% /
    tmpfs                 499M     0  499M   0% /dev/shm
    /dev/vda1              93M   26M   63M  29% /boot
    [root@kvm8 ~]# lvresize -L 20M -r /dev/mapper/vg_kvmhome-vo 
    fsck from util-linux-ng 2.17.2
    e2fsck 1.41.12 (17-May-2010)
    /dev/mapper/vg_kvmhome-vo: clean, 11/24576 files, 8758/92160 blocks
    resize2fs 1.41.12 (17-May-2010)
    Resizing the filesystem on /dev/dm-2 to 20480 (1k) blocks.
    The filesystem on /dev/dm-2 is now 20480 blocks long.
    
      Reducing logical volume vo to 20.00 MiB
      Logical volume vo successfully resized
    [root@kvm8 ~]# mount -a
    [root@kvm8 ~]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/vg_kvmusb-root
                          1.1G  708M  321M  69% /
    tmpfs                 499M     0  499M   0% /dev/shm
    /dev/vda1              93M   26M   63M  29% /boot
    /dev/mapper/vg_kvmhome-vo
                           20M  4.6M   14M  25% /home
    

  4. 新增 LVM partitions 到 VG
    [root@instructor ~]# fdisk -c /dev/sda
    
    Command (m for help): p
    
    Disk /dev/sda: 500.1 GB, 500107862016 bytes
    255 heads, 63 sectors/track, 60801 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x2bd2c32a
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *           1          17      131072   83  Linux
    Partition 1 does not end on cylinder boundary.
    /dev/sda2              17        4096    32768000   8e  Linux LVM
    /dev/sda3            4096        6646    20480000   8e  Linux LVM
    /dev/sda4            6646       60802   435006464    5  Extended
    /dev/sda5            6646        7952    10485760   83  Linux
    /dev/sda6            7952       10563    20979362   8e  Linux LVM
    /dev/sda7           10564       11869    10490413+  8e  Linux LVM
    /dev/sda8           11870       12001     1060258+  8e  Linux LVM
    /dev/sda9           12002       12133     1060258+  8e  Linux LVM
    
    Command (m for help): n
    First cylinder (12134-60802, default 12134): 
    Using default value 12134
    Last cylinder, +cylinders or +size{K,M,G} (12134-60802, default 60802): +2G
    
    Command (m for help): p
    
    Disk /dev/sda: 500.1 GB, 500107862016 bytes
    255 heads, 63 sectors/track, 60801 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x2bd2c32a
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *           1          17      131072   83  Linux
    Partition 1 does not end on cylinder boundary.
    /dev/sda2              17        4096    32768000   8e  Linux LVM
    /dev/sda3            4096        6646    20480000   8e  Linux LVM
    /dev/sda4            6646       60802   435006464    5  Extended
    /dev/sda5            6646        7952    10485760   83  Linux
    /dev/sda6            7952       10563    20979362   8e  Linux LVM
    /dev/sda7           10564       11869    10490413+  8e  Linux LVM
    /dev/sda8           11870       12001     1060258+  8e  Linux LVM
    /dev/sda9           12002       12133     1060258+  8e  Linux LVM
    /dev/sda10          12134       12395     2104483+  83  Linux
    
    Command (m for help): t 
    Partition number (1-10): 10
    Hex code (type L to list codes): 8e
    Changed system type of partition 10 to 8e (Linux LVM)
    
    Command (m for help): p
    
    Disk /dev/sda: 500.1 GB, 500107862016 bytes
    255 heads, 63 sectors/track, 60801 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x2bd2c32a
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *           1          17      131072   83  Linux
    Partition 1 does not end on cylinder boundary.
    /dev/sda2              17        4096    32768000   8e  Linux LVM
    /dev/sda3            4096        6646    20480000   8e  Linux LVM
    /dev/sda4            6646       60802   435006464    5  Extended
    /dev/sda5            6646        7952    10485760   83  Linux
    /dev/sda6            7952       10563    20979362   8e  Linux LVM
    /dev/sda7           10564       11869    10490413+  8e  Linux LVM
    /dev/sda8           11870       12001     1060258+  8e  Linux LVM
    /dev/sda9           12002       12133     1060258+  8e  Linux LVM
    /dev/sda10          12134       12395     2104483+  8e  Linux LVM
    
    Command (m for help): w  
    The partition table has been altered!
    
    Calling ioctl() to re-read partition table.
    
    WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
    The kernel still uses the old table. The new table will be used at
    the next reboot or after you run partprobe(8) or kpartx(8)
    Syncing disks.
    [root@instructor ~]# partprobe 
    Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy).  As a result, it may not reflect all of your changes until after reboot.
    device-mapper: remove ioctl failed: Device or resource busy
    device-mapper: remove ioctl failed: Device or resource busy
    Warning: parted was unable to re-read the partition table on /dev/mapper/GLSguest-demo-real (Device or resource busy).  This means Linux won't know anything about the modifications you made. 
    [root@instructor ~]# reboot
    [root@instructor ~]# fdisk -l /dev/sda
    
    Disk /dev/sda: 500.1 GB, 500107862016 bytes
    255 heads, 63 sectors/track, 60801 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x2bd2c32a
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *           1          17      131072   83  Linux
    Partition 1 does not end on cylinder boundary.
    /dev/sda2              17        4096    32768000   8e  Linux LVM
    /dev/sda3            4096        6646    20480000   8e  Linux LVM
    /dev/sda4            6646       60802   435006464    5  Extended
    /dev/sda5            6646        7952    10485760   83  Linux
    /dev/sda6            7952       10563    20979362   8e  Linux LVM
    /dev/sda7           10564       11869    10490413+  8e  Linux LVM
    /dev/sda8           11870       12001     1060258+  8e  Linux LVM
    /dev/sda9           12002       12133     1060258+  8e  Linux LVM
    /dev/sda10          12134       12395     2104483+  8e  Linux LVM
    
    [root@instructor ~]# pvscan 
      PV /dev/sda8   VG dywvg      lvm2 [1.00 GiB / 0    free]
      PV /dev/sda9   VG dywvg      lvm2 [1.00 GiB / 832.00 MiB free]
      PV /dev/sda3   VG GLSguest   lvm2 [19.50 GiB / 5.00 GiB free]
      PV /dev/sda2   VG GLSvg      lvm2 [31.22 GiB / 0    free]
      PV /dev/sda6   VG GLSvg      lvm2 [20.00 GiB / 6.44 GiB free]
      PV /dev/sda7   VG GLSvg      lvm2 [10.00 GiB / 10.00 GiB free]
      Total: 6 [82.72 GiB] / in use: 6 [82.72 GiB] / in no VG: 0 [0   ]
    [root@instructor ~]# pvcreate /dev/sda10
      Physical volume "/dev/sda10" successfully created
    [root@instructor ~]# pvscan 
      PV /dev/sda8    VG dywvg           lvm2 [1.00 GiB / 0    free]
      PV /dev/sda9    VG dywvg           lvm2 [1.00 GiB / 832.00 MiB free]
      PV /dev/sda3    VG GLSguest        lvm2 [19.50 GiB / 5.00 GiB free]
      PV /dev/sda2    VG GLSvg           lvm2 [31.22 GiB / 0    free]
      PV /dev/sda6    VG GLSvg           lvm2 [20.00 GiB / 6.44 GiB free]
      PV /dev/sda7    VG GLSvg           lvm2 [10.00 GiB / 10.00 GiB free]
      PV /dev/sda10                      lvm2 [2.01 GiB]
      Total: 7 [84.73 GiB] / in use: 6 [82.72 GiB] / in no VG: 1 [2.01 GiB]
    [root@instructor ~]# vgextend dywvg /dev/sda10
      Volume group "dywvg" successfully extended
    [root@instructor ~]# pvscan 
      PV /dev/sda8    VG dywvg      lvm2 [1.00 GiB / 0    free]
      PV /dev/sda9    VG dywvg      lvm2 [1.00 GiB / 832.00 MiB free]
      PV /dev/sda10   VG dywvg      lvm2 [2.00 GiB / 2.00 GiB free]
      PV /dev/sda3    VG GLSguest   lvm2 [19.50 GiB / 5.00 GiB free]
      PV /dev/sda2    VG GLSvg      lvm2 [31.22 GiB / 0    free][root@instructor ~]# vgdisplay 
      --- Volume group ---
      VG Name               dywvg
      System ID             
      Format                lvm2
      Metadata Areas        3
      Metadata Sequence No  19
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                1
      Open LV               1
      Max PV                0
      Cur PV                3
      Act PV                3
      VG Size               4.00 GiB
      PE Size               32.00 MiB
      Total PE              128
      Alloc PE / Size       38 / 1.19 GiB
      Free  PE / Size       90 / 2.81 GiB
      VG UUID               UztTCr-6SxE-x3eL-SR4P-fSEp-yswl-awaCJg
    
      PV /dev/sda6    VG GLSvg      lvm2 [20.00 GiB / 6.44 GiB free]
      PV /dev/sda7    VG GLSvg      lvm2 [10.00 GiB / 10.00 GiB free]
      Total: 7 [84.72 GiB] / in use: 7 [84.72 GiB] / in no VG: 0 [0   ]
    
  5. 從 VG 移除 PV partition
    [root@instructor ~]# pvmove /dev/sda8 /dev/sda10
      /dev/sda8: Moved: 6.2%
      /dev/sda8: Moved: 65.6%
      /dev/sda8: Moved: 100.0%
    [root@instructor ~]# vgreduce dywvg /dev/sda8
      Removed "/dev/sda8" from volume group "dywvg"
    [root@instructor ~]# pvscan 
      PV /dev/sda9    VG dywvg           lvm2 [1.00 GiB / 832.00 MiB free]
      PV /dev/sda10   VG dywvg           lvm2 [2.00 GiB / 1.00 GiB free]
      PV /dev/sda3    VG GLSguest        lvm2 [19.50 GiB / 5.00 GiB free]
      PV /dev/sda2    VG GLSvg           lvm2 [31.22 GiB / 0    free]
      PV /dev/sda6    VG GLSvg           lvm2 [20.00 GiB / 6.44 GiB free]
      PV /dev/sda7    VG GLSvg           lvm2 [10.00 GiB / 10.00 GiB free]
      PV /dev/sda8                       lvm2 [1.01 GiB]
      Total: 7 [84.73 GiB] / in use: 6 [83.72 GiB] / in no VG: 1 [1.01 GiB]
    [root@instructor ~]# pvremove /dev/sda8
      Labels on physical volume "/dev/sda8" successfully wiped
    [root@instructor ~]# pvscan 
      PV /dev/sda9    VG dywvg      lvm2 [1.00 GiB / 832.00 MiB free]
      PV /dev/sda10   VG dywvg      lvm2 [2.00 GiB / 1.00 GiB free]
      PV /dev/sda3    VG GLSguest   lvm2 [19.50 GiB / 5.00 GiB free]
      PV /dev/sda2    VG GLSvg      lvm2 [31.22 GiB / 0    free]
      PV /dev/sda6    VG GLSvg      lvm2 [20.00 GiB / 6.44 GiB free]
      PV /dev/sda7    VG GLSvg      lvm2 [10.00 GiB / 10.00 GiB free]
      Total: 6 [83.72 GiB] / in use: 6 [83.72 GiB] / in no VG: 0 [0   ]
    [root@instructor ~]# ll /mnt/dywlvm/
    total 16
    drwxr-xr-x. 125 root root 12288 Jul 11 08:17 etc
    drwx------.   2 root root  4096 Jul 10 21:45 lost+found
    



2015-04-13