Linux 新增 lvm 硬碟 (調整硬碟大小)

本範例以 VirtualBOX 本機硬碟空間 8G，並新增新硬碟 100G為例
# 檢查新增硬碟空間
fdisk -l

# 規劃同一個 disk (volumn)
fdisk /dev/sdc
Command (m for help): p
Command (m for help): m
Command (m for help): n
p
Partition number (1-4): 1(非常重要該步驟是選擇磁區編號，最多到4，linux磁區會分為sda"sda1、sda2"、sdb、sdc，依序編號下去)
First cylinder (1-39162, default 1):
Command (m for help): p
Command (m for help): w

#再次檢查新增硬碟資訊
fdisk -l
會發現新的硬碟磁區 /dev/sdc1

# 新增 lvm 磁碟空間
pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created

# 延伸磁碟空間
# 檢查 vg 名稱
vgdisplay
vgextend VolGroup /dev/sdc1
Volume group "VolGroup" successfully extended

# 顯示磁區
pvdisplay

  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               VolGroup
  PV Size               7.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              1922
  Free PE               0
  Allocated PE          1922
  PV UUID               pVkbTq-hAQd-tOUw-T3OL-TpMg-d56t-sHJSiL

  --- Physical volume ---
  PV Name               /dev/sdc1
  VG Name               VolGroup
  PV Size               100.00 GiB / not usable 2.66 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              25599
  Free PE               25599
  Allocated PE          0
  PV UUID               TrGTub-QPZm-0aC3-hiEJ-RKU3-RNPs-HvOaMY

# 檢查現有 lvm free 空間
pvscan

  PV /dev/sda2   VG VolGroup   lvm2 [7.51 GiB / 0    free]
  PV /dev/sdc1   VG VolGroup   lvm2 [100.00 GiB / 100.00 GiB free]
  Total: 2 [107.50 GiB] / in use: 2 [107.50 GiB] / in no VG: 0 [0   ]

# 查看 vg 還有多少 PE 未使用
vgdisplay

# 顯示 lv
lvdisplay
# 將 PE 都給 /dev/VolGroup/lv_root
lvresize -l +21760 /dev/VolGroup/lv_root

# 格式化 /dev/VolGroup/lv_root 讓新增的空間生效
resize2fs /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 7
Performing an on-line resize of /dev/VolGroup/lv_root to 27972608 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 27972608 blocks long.

# 再次檢查硬碟空間，會發現 /根目錄已經增加 100G
df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      105G  840M   99G   1% /
tmpfs                 499M     0  499M   0% /dev/shm
/dev/sda1             477M   30M  422M   7% /boot
/dev/sdb             1008G   73M  957G   1% /mnt/newdisk