本文详细介绍了如何在Centos7系统中解决磁盘容量不足的问题，通过在VMware中增加磁盘空间并进行格式化，使用fdisk命令创建新分区，调整分区类型为Linux LVM，并通过partprobe命令通知系统更新分区表。随后，通过pvcreate、vgextend和lvextend命令将新增空间分配给特定逻辑卷，最后使用xfs_growfs同步文件系统。
Centos7系统磁盘容量不足（10g），在vmware中增加到15g，仍需在centos中格式化磁盘。
可以看到整个sda为15g，而sda1和sda2加起来为10g。
fdisk /dev/sda增加主分区。
[root@bogon ~]# 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): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
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 (19984384-31457279, default 19984384):
Using default value 19984384
Last sector, +sectors or +size{K,M,G} (19984384-31457279, default 31457279): 30000000
Partition 3 of type Linux and of size 4.8 GiB is set
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
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): 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.
按照最后的提示，需要重启系统或使用partprobe命令，partprobe来通知系统分区表发生变化。
报错。
/dev/sr0为虚拟光驱，partprobe会默认检查所有设备。
只需要检查指定设备即可。
partprobe /dev/sda
之后lsblk可以看到sda3。
vgdisplay查看所有的volume group。
lvdisplay查看所有的logical volume。
[root@bogon ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID 0TlORf-1qEr-EvLh-xHDO-tbKc-8upc-5HhSXn
LV Write Access read/write
LV Creation host, time localhost, 2020-03-24 16:11:42 +0800
LV Status available
# open 2
LV Size 1.86 GiB
Current LE 477
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/var
LV Name var
VG Name centos
LV UUID TvfTBz-5Zmc-Brdw-FXzl-eeK1-0MQ0-yfbIEC
LV Write Access read/write
LV Creation host, time localhost, 2020-03-24 16:11:43 +0800
LV Status available
# open 1
LV Size <1.86 GiB
Current LE 476
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:3
--- Logical volume ---
LV Path /dev/centos/tmp
LV Name tmp
VG Name centos
LV UUID ZxcFtc-U7LQ-hhl3-1FVb-c9wK-FPDb-3gJlnB
LV Write Access read/write
LV Creation host, time localhost, 2020-03-24 16:11:43 +0800
LV Status available
# open 1
LV Size 956.00 MiB
Current LE 239
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:4
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID 158pHK-30Ac-6C1K-mgJD-aZsD-Mut5-ZhmGuX
LV Write Access read/write
LV Creation host, time localhost, 2020-03-24 16:11:44 +0800
LV Status available
# open 1
LV Size 1.86 GiB
Current LE 477
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
--- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID ovdyZg-KTSR-tvzg-ot3u-GxYa-AZo7-97CpIh
LV Write Access read/write
LV Creation host, time localhost, 2020-03-24 16:11:44 +0800
LV Status available
# open 1
LV Size 956.00 MiB
Current LE 239
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:5
--- Logical volume ---
LV Path /dev/centos/usr
LV Name usr
VG Name centos
LV UUID b6oECZ-FE2o-ugDw-YVEJ-yBge-BoAi-n8vfK5
LV Write Access read/write
LV Creation host, time localhost, 2020-03-24 16:11:44 +0800
LV Status available
# open 1
LV Size 1.86 GiB
Current LE 477
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
需要将sda3的空间分配给/dev/centos/usr这个LV。
pvcreate /dev/sda3创建physical volume（物理卷）。
vgextend centos /dev/sda3扩容卷组centos。
lvextend -L +3G /dev/centos/usr将3g的物理卷分配给/dev/centos/usr这个虚拟卷。此时/dev/centos/usr虚拟卷的大小会改变，但是df -h中/usr的大小没有改变。
xfs_growfs /dev/centos/usr同步文件系统。
同步后df -h和lsblk可以看到空间增加。
至此/usr扩容完毕。
扫一扫
1915
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
