centos7 根目录扩容

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参考技术A

P.S 如果碰到 xfs 提示 xfs_growfs: /dev/centos/root is not a mounted XFS filesystem

fd -Thl

centos 根目录扩容

  1. 添加一块磁盘
    参考上一篇博文VMware Workstation 添加磁盘 挂载目录(centos)
  1. 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
  1. 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 +sizeK,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.
  1. 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
  1. 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
  1. 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).
  1. 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
  1. 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

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