1.使用fdisk /dev/sda, 創建新分區。
注意：不同操作系統的磁盤命名方式不同，有些是/dev/vda或fdisk /dev/sda。具體使用方式參考第三步中fdisk -l首行顯示Disk。
[root@node-002 ~]# fdisk /dev/vda 命令(輸入 m 獲取幫助)： m 命令操作 a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only) 命令(輸入 m 獲取幫助)： n #new 新分區 Partition type: p primary (1 primary, 1 extended, 2 free) l logical (numbered from 5) Select (default p): p #選擇主分區 分區號 (1-4，默認為 3)： 3 #分區序號 起始 sector (499712-314572799，默認為 499712)： #分區開始回車默認 將使用默認值 499712 Last sector, +扇區 or +size{K,M,G} (499712-501757，默認為 501757)： 將使用默認值 501757 命令(輸入 m 獲取幫助)： n #new 新分區 Partition type: p primary (2 primary, 1 extended, 1 free) l logical (numbered from 5) Select (default p): p #選擇主分區 Selected partition 4 #分區序號 起始 sector (62912512-314572799，默認為 62912512)： #分區開始回車默認 將使用默認值 62912512 Last sector, +扇區 or +size{K,M,G} (62912512-314572799，默認為 314572799)： 將使用默認值 314572799 命令(輸入 m 獲取幫助)： t #修改分區格式 分區號 (1-5): 4 #修改分區號 Hex code (type L to list codes): 8e #格式選擇8e linux LVM Changed system type of partition 4 to 8e (Linux LVM) 命令(輸入 m 獲取幫助)： p #顯示分區信息 Disk /dev/sda: 161.1 GB, 161061273600 bytes 16 heads, 63 sectors/track, 312076 cylinders, total 314572800 sectors Units = 扇區 of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0001a023 設備 啟動 起點 終點 塊數 Id 系統 /dev/sda1 * 2048 499711 248832 83 Linux /dev/sda2 501758 62912511 31205377 5 擴展 /dev/sda3 499712 501757 1023 83 Linux Partition table entries are not in disk order 命令(輸入 m 獲取幫助)： w #保存信息 The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: 設備或資源忙. 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.
創建好的磁盤 /dev/sda3
2.重啟Linux操作系統，使用reboot命令。
3.創建物理卷，使用pvcreate /dev/sda3命令。
[root@node-002 dev]# pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created
4.查看新建的物理卷和大小，使用pvdisplay命令。
[root@node-002 dev]# pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name vg_node003 PV Size 19.51 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 4994 Free PE 0 Allocated PE 4994 PV UUID UC4j5m-rJO4-DroW-E92L-n5Vj-SU0U-PJyfJf "/dev/sda3" is a new physical volume of "30.00 GiB" --- NEW Physical volume --- PV Name /dev/sda3 VG Name PV Size 30.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID nng8Gx-51fP-DIBH-YeF4-Sw7B-S0jQ-oGXfpa
5.將添加新的物理卷，加載到vg_node003卷組，使用vgextend vg_node003 /dev/sda3命令。
[root@node-002 dev]# vgextend vg_node003 /dev/sda3 Volume group "vg_node003" successfully extended
6.查看卷組信息，使用vgdisplay命令。
[root@node-002 dev]# vgdisplay --- Volume group --- VG Name vg_node003 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 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 49.50 GiB PE Size 4.00 MiB Total PE 12673 Alloc PE / Size 4994 / 19.51 GiB Free PE / Size 7679 / 30.00 GiB VG UUID v37e5T-4iPX-olm0-Claw-8EfO-axHf-evCAfc
7.增加vg_node003大小，增加30G。使用lvresize -L +30G /dev/mapper/vg_node003-lv_root命令。
注：vg_node003-lv_root在/dev/mapper里面查看
[root@node-002 mapper]# lvresize -L +29.99G /dev/mapper/vg_node003-lv_root Rounding size to boundary between physical extents: 29.99 GiB Size of logical volume vg_node003/lv_root changed from 17.51 GiB (4482 extents) to 47.50 GiB (12160 extents). Logical volume lv_root successfully resized
8.重新識別vg_node003大小，使用resize2fs /dev/mapper/vg_node003-lv_root命令。
[root@node-002 mapper]# resize2fs /dev/mapper/vg_node003-lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/vg_node003-lv_root is mounted on /; on-line resizing required old desc_blocks = 2, new_desc_blocks = 3 Performing an on-line resize of /dev/mapper/vg_node003-lv_root to 12451840 (4k) blocks. The filesystem on /dev/mapper/vg_node003-lv_root is now 12451840 blocks long.
如出現下列情況
resize2fs: Bad magic number in super-block 當嘗試打開 /dev/mapper/vg_node003-lv_root 時 找不到有效的文件系統超級塊.
請使用xfs_growfs /dev/mapper/vg_node003-lv_root
[root@node-002 ~]# xfs_growfs /dev/mapper/vg_node003-lv_root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=2891264 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=11565056, imaxpct=25
= sunit=0 swidth=0 blks
naming = version 2 bsize=4096 ascii-ci=0 ftype=1
log = internal bsize=4096 blocks=5647, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 11565056 to 24672256
9.查看擴容后的大小 ，使用df -h命令。
[root@node-002 mapper]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_node003-lv_root 47G 9.3G 36G 21% / tmpfs 491M 0 491M 0% /dev/shm /dev/sda1 477M 42M 411M 10% /boot
當看到/dev/mapper/vg_node003-lv_root 已經更新到新的大小時，則表示增加成功。