1.先在Vmware上，把虛擬機硬盤做擴展，如果有快照存在，磁盤可能是不可編輯狀態，先刪除快照後再擴展。
2.現在打開虛擬機發現系統的磁盤空間已經擴了，但是硬盤分區可用空間沒變，還是原來的30G
[root@localhost ~]# fdisk -l Disk /dev/sda: 53.6 GB, 53687091200 bytes255 heads, 63 sectors/track, 6527 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 3916 31350847+ 8e Linux LVM
3.使用 fdisk 新建分區，爲lvm擴容做準備
[root@localhost ~]# fdisk /dev/sda The number of cylinders for this disk is set to 6527. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with:1) software that runs at boot time (e.g., old versions of LILO)2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): p Disk /dev/sda: 53.6 GB, 53687091200 bytes255 heads, 63 sectors/track, 6527 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 3916 31350847+ 8e Linux LVM Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 3First cylinder (3917-6527, default 3917): Using default value 3917Last cylinder or +size or +sizeM or +sizeK (3917-6527, default 6527): Using default value 6527Command (m for help): p Disk /dev/sda: 53.6 GB, 53687091200 bytes255 heads, 63 sectors/track, 6527 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 3916 31350847+ 8e Linux LVM /dev/sda3 3917 6527 20972857+ 83 Linux
調整磁盤分區/dev/sda3爲LVM格式，防止重裝系統是不能識別（感覺不調整格式也能用）
Command (m for help): t Partition number (1-4): 3Hex code (type L to list codes): 8e Changed system type of partition 3 to 8e (Linux LVM) Command (m for help): p Disk /dev/sda: 53.6 GB, 53687091200 bytes255 heads, 63 sectors/track, 6527 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 3916 31350847+ 8e Linux LVM /dev/sda3 3917 6527 20972857+ 8e Linux LVM Command (m for help): wThe 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. Syncing disks. [root@localhost ~]# reboot Broadcast message from root (pts/1) (Wed Mar 9 11:00:43 2016): The system is going down for reboot NOW!
如果Re-reading the partition table 失敗，可能分區還未識別，重啓下再看。
4.建立 pv
[root@localhost ~]# pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created
[root@localhost ~]# pvdisplay /dev/cdrom: open failed: No medium found --- Physical volume --- PV Name /dev/sda2 VG Name VolGroup00 PV Size 29.90 GB / not usable 24.06 MB Allocatable yes PE Size (KByte) 32768 Total PE 956 Free PE 2 Allocated PE 954 PV UUID o9H0fA-136u-HmOM-Ga3O-7R0i-VRAS-F1mNxZ --- NEW Physical volume --- PV Name /dev/sda3 VG Name PV Size 20.00 GB Allocatable NO PE Size (KByte) 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID Qib59l-uCF5-5fo0-6oqH-5Url-yuSA-Y6N0E0
5.擴展 vg
[root@localhost ~]# vgextend VolGroup00 /dev/sda3 Volume group "VolGroup00" successfully extended
[root@localhost ~]# vgdisplay --- Volume group --- VG Name VolGroup00 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 49.88 GB PE Size 32.00 MB Total PE 1596 Alloc PE / Size 954 / 29.81 GB Free PE / Size 642 / 20.06 GB VG UUID 8D7xnq-UPBK-LW2U-OCmc-Dl23-cpP1-qLLSHn
6.擴展lv
輸入擴展單元，這裏就是上面的Free PE 的大小。
[root@localhost ~]# lvextend -l +642 /dev/VolGroup00/LogVol00 Extending logical volume LogVol00 to 47.94 GB Logical volume LogVol00 successfully resized
[root@localhost ~]# lvdisplay --- Logical volume --- LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID QDtSfz-1SlB-xl3P-mRZp-H3dx-erAx-mAwrt2 LV Write Access read/write LV Status available # open 1 LV Size 47.94 GB Current LE 1534 Segments 3 Allocation inherit Read ahead sectors 0 Block device 253:0 --- Logical volume --- LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID 6nv9PJ-ho10-LPkA-0GBg-TBZt-z1Tf-F6S2Hu LV Write Access read/write LV Status available # open 1 LV Size 1.94 GB Current LE 62 Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:1
7.調整文件系統
[root@localhost ~]# xfs_growfs /dev/VolGroup00/LogVol00 meta-data=/dev/mapper/VolGroup00-LogVol00 isize=256 agcount=4, agsize=3276800 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 data = bsize=4096 blocks=13107200, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=6400, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 13107200 to 21232640
完成更改
8.打完收工
[root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 48G 27G 19G 59% / /dev/sda1 99M 13M 81M 14% /boot none 772M 0 772M 0% /dev/shm
轉載至：http://www.cnblogs.com/tigertall/p/5257324.html