Linux服務器LVM磁盤擴容

時間 2019-11-20

原文原文鏈接

查看磁盤信息

fdisk -l

啓動VMware環境下的Linux操做系統,添加新分區，須要root帳號身份。

fdisk /dev/sda   # 後邊參數爲指定的擴容的磁盤

命令行提示下輸入【m】輸入命令【n】添加新分區。輸入命令【p】建立主分區。輸入【回車】，選擇默認大小，這樣不浪費空間輸入【回車】，選擇默認的start cylinder。輸入【w】，保持修改node

重啓linux，格式化 /dev/sda3

sudo reboot

操做示例

[root@master /]# fdisk /dev/sda
 
WARNING: The size of this disk is 3.7 TB (3688303165440 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
partition table format (GPT).
 
 
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').
 
Command (m for help): p
 
Disk /dev/sda: 3688.3 GB, 3688303165440 bytes
255 heads, 63 sectors/track, 448410 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: 0x00000b93
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        2611    20458496   8e  Linux LVM
 
Command (m for help): ^C
[root@master /]# fdisk /dev/sda
 
WARNING: The size of this disk is 3.7 TB (3688303165440 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
partition table format (GPT).
 
 
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').
 
Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (2611-448410, default 2611):
Using default value 2611
Last cylinder, +cylinders or +size{K,M,G} (2611-267349, default 267349):
Using default value 267349
 
Command (m for help): p
 
Disk /dev/sda: 3688.3 GB, 3688303165440 bytes
255 heads, 63 sectors/track, 448410 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: 0x00000b93
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        2611    20458496   8e  Linux LVM
/dev/sda3            2611      267349  2126509322+  83  Linux
 
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): 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 or after you run partprobe(8) or kpartx(8)
Syncing disks.

格式化磁盤

[root@master /]#  mke2fs /dev/sda3
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
132907008 inodes, 531627330 blocks
26581366 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
16224 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, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848, 512000000
 
Writing inode tables: done                           
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information:
 
done
 
This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

查看掛載點

[root@master ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_master-lv_root
                       18G   16G  1.1G  94% /
tmpfs                 1.4G   12K  1.4G   1% /dev/shm
/dev/sda1             477M   52M  400M  12% /boot

添加新LVM到已有的LVM組，實現擴容

lvm　　　　　　　　　　　　　　　　　　     進入lvm管理
 
lvm> pvcreate /dev/sda3　　　　　　　　　這是初始化剛纔的分區，必須的
 
lvm> vgextend vg_master /dev/sda3　　　將初始化過的分區加入到虛擬卷組vg_master  （查看虛擬卷組命令：vgdisplay）
 
lvm>lvextend -L +29.9G /dev/vg_master/lv_root　　擴展已有卷的容量（29.9G這個數字在後面解釋）
 
lvm>pvdisplay　　　　　　　　　　　　　　查看卷容量，這時你會看到一個很大的捲了
 
lvm>quit　　　　　　　　　　　　　　　　　退出

上步只是卷擴容了，下面是文件系統的真正擴容

[root@master ~]# resize2fs -p /dev/vg_master/lv_root 30g   //增長分區至30g

再次查看分區信息

[root@master ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_master-lv_root
                       30G   16G   13G  55% /
tmpfs                 1.4G   12K  1.4G   1% /dev/shm
/dev/sda1             477M   52M  400M  12% /boo