CentOS7，新增磁盘后，将/home动态扩容。
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 50G 2.4G 48G 5% /
devtmpfs 15G 0 15G 0% /dev
tmpfs 15G 0 15G 0% /dev/shm
tmpfs 15G 8.5M 15G 1% /run
tmpfs 15G 0 15G 0% /sys/fs/cgroup
/dev/sda1 1014M 145M 870M 15% /boot
/dev/mapper/cl-home 42G 33M 42G 1% /home
tmpfs 3.0G 0 3.0G 0% /run/user/0
[root@localhost ~]# fdisk -l
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 50G 2.4G 48G 5% /
devtmpfs 15G 0 15G 0% /dev
tmpfs 15G 0 15G 0% /dev/shm
tmpfs 15G 8.5M 15G 1% /run
tmpfs 15G 0 15G 0% /sys/fs/cgroup
/dev/sda1 1014M 145M 870M 15% /boot
/dev/mapper/cl-home 42G 33M 42G 1% /home
tmpfs 3.0G 0 3.0G 0% /run/user/0
[root@localhost ~]#Disk /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000962a3
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 209715199 103808000 8e Linux LVM
Disk /dev/mapper/cl-root: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/cl-swap: 7918 MB, 7918845952 bytes, 15466496 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/cl-home: 44.7 GB, 44686114816 bytes, 87277568 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@localhost ~]# fdisk /dev/sda
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.
Command (m for help): p
Disk /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000962a3
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 209715199 103808000 8e Linux LVM
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3): 3
First sector (209715200-1048575999, default 209715200):
Using default value 209715200
Last sector, +sectors or +size{K,M,G} (209715200-1048575999, default 1048575999):
Using default value 1048575999
Partition 3 of type Linux and of size 400 GiB is set
Command (m for help): t
Partition number (1-3, default 3): 3
Hex code (type L to list all codes): l
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000962a3
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 209715199 103808000 8e Linux LVM
/dev/sda3 209715200 1048575999 419430400 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.
[root@localhost ~]#
重启服务器
[root@localhost ~]# reboot
格式化分區
[root@localhost ~]# mkfs -t xfs /dev/sda3如果提示已经存在文件系统，加-f参数强行格式化
[root@localhost ~]# mkfs -t xfs -f /dev/sda3
新加的逻辑卷扩容到已有分区/dev/mapper/cl-home
[root@localhost ~]# pvcreate /dev/sda3 // 创建物理卷
' Physical volume "/dev/sda3" successfully created.
[root@localhost ~]# pvdisplay // 查看当前磁盘VG Name
[root@localhost ~]# vgextend cl /dev/sda3 // 向卷组添加物理卷
Volume group "cl" successfully extended
[root@localhost ~]# lvextend -l +100%FREE /dev/mapper/cl-home
Size of logical volume cl/home changed from 41.62 GiB (10654 extents) to 441.62 GiB (113054 extents).
Logical volume cl/home successfully resized.
[root@localhost ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Thu Feb 23 04:20:19 2017
#
# 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/cl-root / xfs defaults 0 0
UUID=dbde1d57-dfb5-475a-8018-de46053bb8b4 /boot xfs defaults 0 0
/dev/mapper/cl-home /home xfs defaults 0 0
/dev/mapper/cl-swap swap swap defaults 0 0
[root@localhost ~]# xfs_growfs /dev/mapper/cl-home
meta-data=/dev/mapper/cl-home isize=512 agcount=4, agsize=2727424 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=10909696, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=5327, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 10909696 to 115767296
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 50G 2.4G 48G 5% /
devtmpfs 15G 0 15G 0% /dev
tmpfs 15G 0 15G 0% /dev/shm
tmpfs 15G 8.5M 15G 1% /run
tmpfs 15G 0 15G 0% /sys/fs/cgroup
/dev/sda1 1014M 145M 870M 15% /boot
/dev/mapper/cl-home 442G 34M 442G 1% /home
tmpfs 3.0G 0 3.0G 0% /run/user/0
[root@localhost ~]#
/home动态扩容完成。
note:
1. 已有磁盘配置LVM，并挂载到现有磁盘上
fdisk /dev/vda # 添加新的磁盘分区vda3 reboot # 重启服务器 fdisk -l /dev/vda # 查看新的分区 mkfs -t xfs /dev/vda3 # 格式化新LV pvcreate /dev/vda3 # 创建PV pvdisplay # 查看现有VG Name：centos vgextend centos /dev/vda3 # 扩展VG lvextend -l +100%FREE /dev/mapper/centos-root # 扩容已有分区 xfs_growfs /dev/mapper/centos-root # 扩容已有分区 df -h # 查看磁盘是否扩容成功
2. 新增磁盘，逻辑卷挂载到新建分区（新建文件夹）/data/上
fdisk /dev/vdb # 添加新的磁盘分区vdb1 reboot # 重启服务器 fdisk -l /dev/vdb # 查看新的分区 pvcreate /dev/vdb1 # 创建PV vgextend centos /dev/vdb1 # 扩展VG lvcreate -l 100%FREE -n data centos # 创建LV mkfs.xfs /dev/centos/data # 格式化新LV mkdir /data # 创建挂载点 mount /dev/centos/data /data/ # 挂载新磁盘 df -h # 查看新增磁盘挂载成功 vi /etc/fstab # 设置开机自动挂载 reboot # 重启服务器 df -h # 验证磁盘重启后自动挂载成功