Linux扩容分区操作过程

Linux扩容分区操作过程

查看新增磁盘

在服务器上新加一块10G大小的磁盘 [root@centos002 ~]# fdisk -l .................................................... Disk /dev/sdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000

创建分区与格式化

#新建分区 [root@centos002 ~]# fdisk /dev/sdb Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-1305, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): Using default value 1305 Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. #格式化分区 [root@centos002 ~]# mkfs.ext4 /dev/sdb1 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 655360 inodes, 2620595 blocks 131029 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2684354560 80 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 Writing inode tables: done
Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 26 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.

将新分区更改成支持LVM格式

[root@centos002 ~]# fdisk /dev/sdb Command (m for help): p Disk /dev/sdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x3ec1c9a6 Device Boot Start End Blocks Id System /dev/sdb1 1 1305 10482381 83 Linux Command (m for help): t Selected partition 1 Hex code (type L to list codes): 8e Changed system type of partition 1 to 8e (Linux LVM) Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. #查看更改后的分区格式

查看VG

[root@centos002 ~]# vgdisplay --- Volume group --- VG Name vg_centos002 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 19.51 GiB PE Size 4.00 MiB Total PE 4994 Alloc PE / Size 4994 / 19.51 GiB Free PE / Size 0 / 0
VG UUID ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O

创建PV并查看

[root@centos002 ~]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created [root@centos002 ~]# pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name vg_centos002 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 Z7AOVb-LEzI-su15-J5lC-alj8-a94k-1NmRRv

"/dev/sdb1" is a new physical volume of "10.00 GiB" --- NEW Physical volume --- PV Name /dev/sdb1 VG Name
PV Size 0.00 GiB Allocatable NO PE Size 0
Total PE 0 Free PE 0 Allocated PE 0 PV UUID 4N37pw-Q59f-FRZE-glEx-lRWh-BY5O-Zk9JrF

查看LV

[root@centos002 ~]# lvdisplay --- Logical volume --- LV Path /dev/vg_centos002/lv_root LV Name lv_root VG Name vg_centos002 LV UUID 2G4f2m-gkIR-xXG0-MCfO-jFO2-jYNC-IBKYqL LV Write Access read/write LV Creation host, time centos002, 2017-08-21 13:15:29 +0800 LV Status available

open 1

LV Size 17.57 GiB Current LE 4498 Segments 1 Allocation inherit Read ahead sectors auto

• currently set to 256 Block device 253:0

--- Logical volume --- LV Path /dev/vg_centos002/lv_swap LV Name lv_swap VG Name vg_centos002 LV UUID ITJYHF-bGpM-z314-lW1B-q8gj-8tgl-8NZ4bM LV Write Access read/write LV Creation host, time centos002, 2017-08-21 13:15:34 +0800 LV Status available

open 1

LV Size 1.94 GiB Current LE 496 Segments 1 Allocation inherit Read ahead sectors auto

• currently set to 256 Block device 253:1

扩展卷组VG

[root@centos002 ~]# vgextend vg_centos002 /dev/sdb1 Volume group "vg_centos002" successfully extended [root@centos002 ~]# vgdisplay --- Volume group --- VG Name vg_centos002 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 29.50 GiB PE Size 4.00 MiB Total PE 7552 Alloc PE / Size 4994 / 19.51 GiB Free PE / Size 2558 / 9.99 GiB VG UUID ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O #此时查看磁盘大小并没有增加 [root@centos002 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_centos002-lv_root 18G 803M 16G 5% / tmpfs 238M 0 238M 0% /dev/shm /dev/sda1 77M 28M 425M 7% /boot

扩展逻辑卷LVM

#扩展LVM分区大小 [root@centos002 ~]# lvextend -L 28G /dev/vg_centos002/lv_root Insufficient free space: 2670 extents needed, but only 2558 available #报错说明扩容的空间不足，需要调整值 [root@centos002 ~]# lvextend -L 27G /dev/vg_centos002/lv_root Size of logical volume vg_centos002/lv_root changed from 17.57 GiB (4498 extents) to 27.00 GiB (6912 extents). Logical volume lv_root successfully resized.

重设分区大小

#重设根分区大小 [root@centos002 ~]# resize2fs /dev/vg_centos002/lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/vg_centos002/lv_root is mounted on /; on-line resizing required old desc_blocks = 2, new_desc_blocks = 2 Performing an on-line resize of /dev/vg_centos002/lv_root to 7077888 (4k) blocks. The filesystem on /dev/vg_centos002/lv_root is now 7077888 blocks long.