First identify the disk will appear under / dev After successfully
[root@oracle01 ~]# fdisk /dev/sda
## / dev / sda of view by fdisk -l physical disk (first row)
Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command.
The Command (m for Help): n- ## n-create a new partition
the Partition type: ## here need to select or create a primary partition extended partition, you can be, directly selected from primary partition where
p primary (2 primary, 0 extended , 2 Free)
E Extended
the select (default P): P ## choose to create a primary partition, the primary partition can have four, numbered 1-4, all of the following direct the transport like, with the remainder automatically space is created
the Partition Number (3,4-, default. 3):
First a SECTOR (104857600-209715199, default 104857600):
the Using default value 104857600
Last a SECTOR, sectors or + size + {K, M, G} (104857600-209715199, default 209 715 199):
the Using default value 209 715 199
Partition 3 of Linux and of the type of size 50 GiB the SET IS
The Command (m for Help): T ## T to modify the partition type
the Partition Number (1-3, default. 3):. 3 ## just created for the section number. 3
Hex code (type L to List All Codes): 8E ## 8e lvm partition is formatted
Changed type of partition 'Linux' to 'Linux LVM'
The Command (m for Help): W ## W stored and written to disk.
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 or after you run partprobe(8) or kpartx(8)
Syncing disks.
Here, after saving, you will find an error may occur, display busy to re-read the partition information. Here are solutions. It can be used to restart or perform partprobe or kpartx. So, here performed directly partprobe
[root@oracle01 ~]# partprobe
2. Create a physical partition, you need to create a physical partition physical volume:
## 3 physical partitions to create physical volumes, where the / dev / sda3 is the first step in creating a physical partition by fdisk -l can see
## is the first partition on a physical disk / dev / sda below ( a disk can have multiple partitions), had been / dev / sda1, / dev / sda2
## generated by the first step in creating / dev / sda3 partition, and then create the partition as a physical volume
[root@oracle01 ~]# pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created. [root@oracle01 ~]# pvdisplay ## 查看物理卷 --- Physical volume --- PV Name /dev/sda2 VG Name centos PV Size 49.51 GiB / not usable 3.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 12674 Free PE 11 Allocated PE 12663 PV UUID 8T9dpf-SrDj-maVi-IlAb-tpPb-Lzyt-WLeRHG "/dev/sda3" is a new physical volume of "50.00 GiB" --- NEW Physical volume --- PV Name /dev/sda3 VG Name PV Size 50.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID uRRJtJ-Ds7J-dvqs-y5Lb-W95H-FXeh-C2QNtl
3. Physical volume Once created, you need to add a physical volume to the volume group, so as to be distributed in the volume group.
[root@oracle01 ~]# vgdisplay ## 查看卷组 --- Volume group --- VG Name centos 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 <49.51 GiB PE Size 4.00 MiB Total PE 12674 Alloc PE / Size 12663 / 49.46 GiB The PE as Free / Size . 11 / 44.00 MiB volume group ## can see only the remaining space of 44M, the other logical volumes are divided into a similar partitioned VG of the UUID 3TMbc1 -A7aP-DAMv-QtUU-VTjC- 4tOf- iAxDkc [oracle01 the root @ ~] # the vgextend CentOS / dev / sda3 physical volume ## is added to the volume group volume group " CentOS " successfully Extended [oracle01 the root @ ~ ] # vgdisplay ## after the addition, check again the volume group - - Volume Group --- VG of the Name CentOS the System ID the Format LVM2 the Metadata Areas 2 the Metadata Sequence No . 5 VG of Access Read / Write VG of the Status resizable MAX the LV 0 the Cur the LV 2 the Open the LV 2 Max the PV 0 the Cur the PV 2 Act the PV 2 VG of Size 99.50 GiB the PE Size 4.00 MiB the Total the PE 25473 of Alloc the PE / Size 12663 / 49.46 GiB as Free the PE / Size 12810 / < 50.04 GiB ## can be seen, added after the success of the remaining space in the volume group becomes large, so there is more space can be allocated, or create new new logical volume VG UUID 3TMbc1 -A7aP-DAMv-QtUU-VTjC-4tOf-iAxDkc
4. add to the volume group, logical volume is the remaining space for expansion.
[root @ oracle01 ~ ] # ## to see the lvdisplay logical --- --- the Logical Volume LV Path / dev / CentOS / root ## Logical Volume Name LV the Name root VG the Name CentOS LV UUID RaEygR -53tg-UaJQ-5dJs- by51--e8V4 fcp1DQ the LV the Write Access Read / Write the LV Creation Host, Time localhost.localdomain, 2017 - 09 - 30 . 19 : 12 is : 05 + 0800 the LV the Status Available # Open . 1 the LV size 45.46 front GiB ## increases, the size of the logical volume LE Current 11639 Segments. 1 Allocation the inherit the Read Ahead sectors Auto - Currently SET to 8192 Block Device 253 : 0 [oracle01 the root @ ~] # the lvextend -l + 100 % the FREE / dev / CentOS / the root ## and the remaining space is added to the logical volume hundred percent the Size of Logical Volume CentOS / changed from the root 45.46 GiB ( 11639 extents) to 95.50 GiB ( 24449 extents). the Logical Volume CentOS / the root Resized successfully. [oracle01 the root @ ~ ] # the lvdisplay --- --- the Logical Volume the LV the Path / dev / CentOS / root LV the Name root VG Name centos LV UUID RaEygR-53tg-UaJQ-5dJs-e8V4-by51-fcp1DQ LV Write Access read/write LV Creation host, time localhost.localdomain, 2017-09-30 19:12:05 +0800 LV Status available # open 1 LV Size 95.50 GiB ## 增加后，逻辑卷大小 Current LE 24449 Segments 3 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0
5. recognize it and then re-partition size, you can see the new -h capacity by df
[oracle01 the root @ ~] # xfs_growfs / dev / CentOS / the root ## command, followed by the logical volume with the path Meta -data = / dev / Mapper / CentOS an array of lSize = the root- 256 agcount = . 4 , agsize = 2979584 BLKS = sectsz = 512 attr = 2 , projid32bit = . 1 = CRC = 0 finobt = 0 Data = BSIZE = 4096 Blocks = 11,918,336 , imaxpct = 25 = SUnit = 0 SWidth = 0 BLKS Naming = Version 2 BSIZE = 4096 ASCII-CI = 0 FTYPE = 0 log =internal bsize=4096 blocks=5819, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 11918336 to 25035776
[root@oracle01 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 96G 32G 64G 34% / ## 这里可以看到，已成功扩容 devtmpfs 1.9G 0 1.9G 0% /dev tmpfs 1.9G 0 1.9G 0% /dev/shm tmpfs 1.9G 17M 1.9G 1% /run tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup /dev/sda1 497M 125M 372M 26% /boot tmpfs 379M 0 379M 0% /run/user/0
OK, this, the expansion is complete. And without rebooting, easy to use.