1.先在Vmware上，把虚拟机硬盘做扩展，如果有快照存在，磁盘可能是不可编辑状态，先删除快照后再扩展。
2.现在打开虚拟机发现系统的磁盘空间已经扩了，但是硬盘分区可用空间没变，还是原来的30G
[root@localhost ~]# fdisk -l Disk /dev/sda: 53.6 GB, 53687091200 bytes 255 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 新建分区，为lvm扩容做准备
[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 bytes 255 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): 3 First cylinder (3917-6527, default 3917): Using default value 3917 Last cylinder or +size or +sizeM or +sizeK (3917-6527, default 6527): Using default value 6527 Command (m for help): p Disk /dev/sda: 53.6 GB, 53687091200 bytes 255 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
调整磁盘分区/dev/sda3为LVM格式，防止重装系统是不能识别（感觉不调整格式也能用）
Command (m for help): t Partition number (1-4): 3 Hex 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 bytes 255 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): 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. 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 失败，可能分区还未识别，重启下再看。
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.扩展 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.扩展lv
输入扩展单元，这里就是上面的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.调整文件系统
[root@localhost ~]# resize2fs /dev/mapper/VolGroup00-LogVol00 resize2fs 1.35 (28-Feb-2004) /dev/mapper/VolGroup00-LogVol00 is mounted; can't resize a mounted filesystem!
不能调整，使用 ext2online，我这边文件系统估计有点不对，所有会有些inode调整，忽略。
[root@localhost ~]# ext2online -v /dev/mapper/VolGroup00-LogVol00 ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b new filesystem size 12550144 group 2 inode table has offset 2, not 1029 group 4 inode table has offset 2, not 1029 ... using 1024 reserved group descriptor blocks creating group 382 with 32768 blocks (rsvd = 1023, newgd = 3) cache direct hits: 160, indirect hits: 1, misses: 4
注意，对于新的CentOS系统，可能是使用 xfs 格式的分区，需要用别的命令调整
[root@vt-c7 ~]# resize2fs /dev/mapper/centos-root resize2fs 1.42.9 (28-Dec-2013) resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root Couldn't find valid filesystem superblock.
检查是xfs格式并使用 xfs_growfs 命令来扩展
[root@vt-c7 ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Sun Apr 29 21:12:56 2018 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/centos-root / xfs defaults 0 0 UUID=7c27bad9-295a-4323-afc8-b1f721ba5a5d /boot xfs defaults 0 0 /dev/mapper/centos-swap swap swap defaults 0 0 [root@vt-c7 ~]# xfs_growfs /dev/mapper/centos-root meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=436992 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0 spinodes=0 data = bsize=4096 blocks=1747968, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 1747968 to 3854336 [root@vt-c7 ~]#
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
