centos 根目录扩容
- 添加一块磁盘
参考上一篇博文VMware Workstation 添加磁盘 挂载目录(centos)
- 查看当前磁盘挂载情况
[root@node1 ~]# fdisk -l
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: 0x000bd826
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 1048575999 523238400 8e Linux LVM
Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 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: 0x2890866a
Device Boot Start End Blocks Id System
/dev/sdb1 2048 209715199 104856576 83 Linux
Disk /dev/sdc: 107.4 GB, 107374182400 bytes, 209715200 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/centos-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/centos-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
Disk /dev/mapper/centos-home: 480.0 GB, 479954206720 bytes, 937410560 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
- 磁盘分区
[root@node1 ~]# fdisk /dev/sdc //选择操作的磁盘
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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xb9ce2594.
Command (m for help): p //查看磁盘分区情况（当前未分区）
Disk /dev/sdc: 107.4 GB, 107374182400 bytes, 209715200 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: 0xb9ce2594
Device Boot Start End Blocks Id System
Command (m for help): n //重新分区
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p //主分区
Partition number (1-4, default 1)://主分区编号 默认即可
First sector (2048-209715199, default 2048)://主分区开始扇区 默认即可
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199)://主分区结束扇区 默认即可
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
Command (m for help): t //更改分区的系统id
Selected partition 1
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 //选择8e（lvm）
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p //查看分区情况
Disk /dev/sdc: 107.4 GB, 107374182400 bytes, 209715200 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: 0xb9ce2594
Device Boot Start End Blocks Id System
/dev/sdc1 2048 209715199 104856576 8e Linux LVM
Command (m for help): w //保存
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
- 创建物理卷
[root@node1 ~]# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created.
[root@node1 ~]# pvdisplay // 查看物理卷信息
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <499.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 127743
Free PE 1
Allocated PE 127742
PV UUID 3ajula-aPHg-hffV-1iC5-N7yq-aQjk-wVze0M
"/dev/sdc1" is a new physical volume of "<100.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdc1
VG Name
PV Size <100.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID w2DoiS-Vvz7-jm0E-ofTL-mebV-9d9E-PYwa8s
[root@node1 ~]# vgdisplay // 查看物理卷信息
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size <499.00 GiB
PE Size 4.00 MiB
Total PE 127743
Alloc PE / Size 127742 / 498.99 GiB
Free PE / Size 1 / 4.00 MiB //此时没有扩展内存
VG UUID X10fAx-IgS1-V7fr-1VSd-jzjT-4ufc-mxD24J
- 将新增加的分区/dev/sdc1加入到根目录分区centos中
[root@node1 ~]# vgextend centos /dev/sdc1
Volume group "centos" successfully extended
[root@node1 ~]# vgdisplay // 查看物理卷信息
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 2
Act PV 2
VG Size 598.99 GiB
PE Size 4.00 MiB
Total PE 153342
Alloc PE / Size 127742 / 498.99 GiB
Free PE / Size 25600 / 100.00 GiB //此时扩展内存为100G
VG UUID X10fAx-IgS1-V7fr-1VSd-jzjT-4ufc-mxD24J
- 进行卷扩容
[root@node1 ~]# lvextend -l +100%FREE /dev/mapper/centos-root
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 150.00 GiB (38400 extents).
- 调整卷分区大小
[root@node1 ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 39321600
- 查看扩容结果
[root@node1 ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 150G 49G 102G 33% / //扩容成功
devtmpfs devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs tmpfs 3.9G 12M 3.8G 1% /run
tmpfs tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 142M 873M 14% /boot
/dev/mapper/centos-home xfs 447G 1.2G 446G 1% /home
tmpfs tmpfs 781M 0 781M 0% /run/user/0
此文为本人原创文章，转载请注明出处！！！
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