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68.3. 邏輯卷管理(logical volume)

68.3.1. lvcreate

創建1000M邏輯卷

# lvcreate -l 1000 -n lv0 vg1
  Logical volume "lv0" created

# ls /dev/vg1/lv0
			

使用-L參數

# lvcreate -L 100G -n lv3 vg1
  Logical volume "lv3" created
			

68.3.1.1. snapshot

# lvcreate --size 16m --snapshot --name snap0 /dev/vg1/lv0
  Logical volume "snap0" created

# find /dev/vg1/
/dev/vg1/
/dev/vg1/snap0
/dev/vg1/lv3
/dev/vg1/lv1
/dev/vg1/lv0
				

68.3.2. lvdisplay

# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg1/lv0
  VG Name                vg1
  LV UUID                DyvPgz-VFjs-gu58-mxNX-ybCm-tcUP-kKk90y
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                40.00 GiB
  Current LE             10239
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/vg1/lv1
  VG Name                vg1
  LV UUID                8Nbuio-w2CH-euVD-9LNB-3Dcd-frS0-Cm3EBD
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                3.91 GiB
  Current LE             1000
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
			

68.3.3. lvremove

# lvcreate -l 1000 -n lv1 vg1
  Logical volume "lv1" created

# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg1/lv0
  VG Name                vg1
  LV UUID                DyvPgz-VFjs-gu58-mxNX-ybCm-tcUP-kKk90y
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                40.00 GiB
  Current LE             10239
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/vg1/lv1
  VG Name                vg1
  LV UUID                8Nbuio-w2CH-euVD-9LNB-3Dcd-frS0-Cm3EBD
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                3.91 GiB
  Current LE             1000
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1


# lvremove /dev/vg1/lv1
Do you really want to remove active logical volume lv1? [y/n]: y
  Logical volume "lv1" successfully removed

# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg1/lv0
  VG Name                vg1
  LV UUID                DyvPgz-VFjs-gu58-mxNX-ybCm-tcUP-kKk90y
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                40.00 GiB
  Current LE             10239
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
			

68.3.3.1. snapshot

# lvremove /dev/vg1/snap0
Do you really want to remove active logical volume snap0? [y/n]: y
  Logical volume "snap0" successfully removed