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这篇文章介绍了一下如何在Vmare下添加或扩展磁盘并使之有效。
场景
创建Linux时分配磁盘空间随着使用的增加，使用率逐渐升高，此时需要在添加或者扩展一下磁盘。
比如：此Linux(CentOS 7.3)的磁盘为20G，目前已经使用到接近80%
[root@mail ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
[root@mail ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/cl_angular-root 17811456 13985948 3825508 79% /
devtmpfs 1521180 0 1521180 0% /dev
tmpfs 1532160 0 1532160 0% /dev/shm
tmpfs 1532160 8776 1523384 1% /run
tmpfs 1532160 0 1532160 0% /sys/fs/cgroup
/dev/sda1 1038336 123500 914836 12% /boot
tmpfs 306432 0 306432 0% /run/user/0
[root@mail ~]#
扩展磁盘或者添加磁盘
Vmware下有两种方式：
注意：扩展磁盘需要在此虚拟机停止的状态下进行，同时扩展的数字是扩展后的预期大小，比如事前为20G，希望扩展10G，应该输入30。这篇文章使用扩展磁盘的方式。
确认状态
扩展后，重新启动linux，发现df状态没有变化
[root@mail ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/cl_angular-root 17811456 13985948 3825508 79% /
devtmpfs 1521180 0 1521180 0% /dev
tmpfs 1532160 0 1532160 0% /dev/shm
tmpfs 1532160 8776 1523384 1% /run
tmpfs 1532160 0 1532160 0% /sys/fs/cgroup
/dev/sda1 1038336 123500 914836 12% /boot
tmpfs 306432 0 306432 0% /run/user/0
[root@mail ~]#
使用fdisk确认磁盘空间是否已经扩展
[root@mail ~]# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 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: 0x0005ba89
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
Disk /dev/mapper/cl_angular-root: 18.2 GB, 18249416704 bytes, 35643392 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_angular-swap: 2147 MB, 2147483648 bytes, 4194304 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@mail ~]#
可以看到“Disk /dev/sda: 32.2 GB”，已经扩展了10G空间。
扩展分区
[root@mail ~]# 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): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3):
First sector (41943040-62914559, default 41943040):
Using default value 41943040
Last sector, +sectors or +size{K,M,G} (41943040-62914559, default 62914559):
Using default value 62914559
Partition 3 of type Linux and of size 10 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 swad上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对社区的支持。如果你想了解更多相关内容请查看下面相关链接
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