In the usual development work, often not large enough to create a disk of the virtual machine, and then write some data to a cluster which led to the disk is full. Manually edit the virtual machine's disk file size is not recognized by the system, most of the students could do nothing but re-installed OS, here I introduce based on LVMdynamic way.
LVM understand
LVMIs a logical disk volume management ( LogicalVolumeManager) short, it is Linuxa mechanism for disk partition management environment, LVMis built on the hard disk and partition a logical layer to increase the flexibility of the disk partition management. By LVM system administrator can easily manage disk partitions, such as: the plurality of disk partitions into a monolithic volume group ( volumegroup), forming a storage pool. Administrators can create freely on a volume group logical volume group ( logicalvolumes), and further create a file system on the logical volume group. Administrators by LVMsize can easily adjust the storage volume group, and may be named for disk storage, management and distribution in accordance with the group's way.
View Subdivision
The current default uses only one lvmpartition, at the beginning sdaof disk capacity 16G, but later found not enough, editing disk size 50G, but you can find it 50Gand did not work extended partition capacity.
[the root @ Tony-Play ~] # the fdisk / dev / SDA the WARNING:. the DOS-compatible MODE IS deprecated It apos Strongly Recommended to Switch OFF The MODE (Command 'C') and Change the display Units to sectors (Command 'U'). the Command (m for Help): n- the Command Action E Extended P Primary Partition (1-4) P the Partition Number (1-4):. 3 First Cylinder (2089-6527, default 2089): // direct the transport, with default values it the using default value 2089 Last Cylinder, or Cylinders + size + {K, m, G} (2089-6527, default 6527): // direct the transport, will be able to use the default values the using default value 6527 the Command (m Help for): w at The Partition the Table has been the Altered!
# You can see the new partition sda3 has been created out of the junction, take all the remaining space will be the default values are assigned to the partition [root @ Tony-Play ~] # lsblk NAME MAJ: MIN RM MOUNTPOINT the TYPE SIZE RO SR0 11: 1024M ROM. 1 0 0 SDA. 8: 0 0 0 50G Disk ├─sda1. 8: Part. 1 0 0 500M / Boot ├─sda2. 8: 15.5 g of 2 0 0 Part │ ├─vg_tonyplay-lv_root (DM-0) 253: 0 13.9 g of LVM 0 0 / │ └─vg_tonyplay-lv_swap (. 1-DM) 253: 1.6G. 1 0 0 LVM [the SWAP] └─sda3. 8: Part. 3 0 0 34G
View the current file system
Current file systemext4
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[root@tony-play ~]# mount /dev/mapper/vg_tonyplay-lv_root on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0") /dev/sda1 on /boot type ext4 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
[root@tony-play ~]# sudo mkfs.ext4 /dev/sda3 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 2228224 inodes, 8912727 blocks 445636 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 272 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624
[root@tony-play ~]# vgdisplay --- Volume group --- VG Name vg_tonyplay // 卷组名在下面扩展中会用到 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 15.51 GiB PE Size 4.00 MiB Total PE 3970 Alloc PE / Size 3970 / 15.51 GiB Free PE / Size 0 / 0 VG UUID Y9usSM-nDU5-ZAUd-Y3Te-u5Pd-uFBr-gcYHf0
创建新物理卷
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[root@tony-play ~]# pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created
扩展到卷组
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vgextend vg_tonyplay /dev/sda3 // 卷组名在查看卷组信息中 Volume group "vg_tonyplay" successfully extended
[root@tony-play ~]# lvdisplay --- Logical volume --- LV Path /dev/vg_tonyplay/lv_root // 根分区 LV Name lv_root VG Name vg_tonyplay LV UUID IPd7lm-Sx8g-pe7k-llNL-j1wc-mbA2-2cAdsy LV Write Access read/write LV Creation host, time tony-play, 2017-04-10 17:58:53 -0400 LV Status available # open 1 LV Size 13.91 GiB Current LE 3561 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0
--- Logical volume --- LV Path /dev/vg_tonyplay/lv_swap LV Name lv_swap VG Name vg_tonyplay LV UUID qX637q-iD6i-8blp-hmmS-MvLy-xZ0y-b4D0BF LV Write Access read/write LV Creation host, time tony-play, 2017-04-10 17:59:07 -0400 LV Status available # open 1 LV Size 1.60 GiB Current LE 409 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1
扩展容量到逻辑分区
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[root@tony-play ~]# lvextend /dev/vg_tonyplay/lv_root /dev/sda3 Size of logical volume vg_tonyplay/lv_root changed from 13.91 GiB (3561 extents) to 47.91 GiB (12264 extents). Logical volume lv_root successfully resized
刷新逻辑分区容量使扩展生效
ext4用resize2fs，xfs用xfs_growfs
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[root@tony-play ~]# resize2fs /dev/vg_tonyplay/lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/vg_tonyplay/lv_root is mounted on /; on-line resizing required old desc_blocks = 1, new_desc_blocks = 3 Performing an on-line resize of /dev/vg_tonyplay/lv_root to 12558336 (4k) blocks. The filesystem on /dev/vg_tonyplay/lv_root is now 12558336 blocks long.
查看逻辑分区容量
It can be found /dev/mapper/vg_tonyplay-lv_rootalready from the beginning of the 14Gextension to 48G. ok, which shows you're done, no longer have to reinstall the system expansion through this lame way
