[ CentOS7.xシステムルートディレクトリパーティション拡張]（https://www.cnblogs.com/himismad/p/7851548.html）
注：システムバージョンはLinuxバージョン3.10.0-327.el7.x86_64です。
step1。既存のディスク情報を確認すると、ルートパーティションに45Gがあることがわかります。
[ root@DEV-CMDB-DB02 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos_mb--centos7-root 45G 9.8G 35G 23% /
devtmpfs 5.9G 05.9G 0%/dev
tmpfs 5.9G 84K 5.9G 1%/dev/shm
tmpfs 5.9G 8.9M 5.9G 1%/run
tmpfs 5.9G 05.9G 0%/sys/fs/cgroup
/dev/sda1 497M 142M 356M 29%/boot
tmpfs 1.2G 16K 1.2G 1%/run/user/42
tmpfs 1.2G 01.2G 0%/run/user/0
step2。新しく追加されたディスク情報を表示する
[ root@DEV-CMDB-DB02 ~]# fdisk -l
Disk /dev/sda:53.7 GB,53687091200 bytes,104857600 sectors
Units = sectors of1*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:0x000e0945
Device Boot Start End Blocks Id System
/dev/sda1 *2048102604751200083 Linux
/dev/sda2 102604810485759951915776 8e Linux LVM
Disk /dev/sdb:107.4 GB,107374182400 bytes,209715200 sectors
Units = sectors of1*512=512 bytes
Sector size(logical/physical):512 bytes /512 bytes
I/O size(minimum/optimal):512 bytes /512 bytes
Disk /dev/mapper/centos_mb--centos7-root:47.7 GB,47747956736 bytes,93257728 sectors
Units = sectors of1*512=512 bytes
Sector size(logical/physical):512 bytes /512 bytes
I/O size(minimum/optimal):512 bytes /512 bytes
Disk /dev/mapper/centos_mb--centos7-swap:5368 MB,5368709120 bytes,10485760 sectors
Units = sectors of1*512=512 bytes
Sector size(logical/physical):512 bytes /512 bytes
I/O size(minimum/optimal):512 bytes /512 bytes
step3。上記の情報に従って、新しく追加したディスクをパーティション分割します
[ root@DEV-CMDB-DB02 ~]# fdisk /dev/sdb
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 newDOS disklabel with disk identifier 0x232defba.Command(m for help): p
Disk /dev/sdb:107.4 GB,107374182400 bytes,209715200 sectors
Units = sectors of1*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:0x232defba
Device Boot Start End Blocks Id System
Command(m for help): n
Partition type:
p primary(0 primary,0 extended,4 free)
e extended
Select(default p): p
Partition number(1-4,default1):1
First sector(2048-209715199,default2048):
Using default value 2048
Last sector,+sectors or +size{K,M,G}(2048-209715199,default209715199):
Using default value 209715199
Partition 1of type Linux and of size 100 GiB is setCommand(m for help): t
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 983 Linux c4 DRDOS/sec(FAT-3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec(FAT-4 FAT16 <32M 40 Venix 8028685 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 <361 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
1 b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1 c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1 e 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/sdb:107.4 GB,107374182400 bytes,209715200 sectors
Units = sectors of1*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:0x232defba
Device Boot Start End Blocks Id System
/dev/sdb1 2048209715199104856576 8e Linux LVM
Command(m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
step4。物理ボリュームを作成します
[ root@DEV-CMDB-DB02 ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
step5。物理ボリューム情報を表示する
[ root@DEV-CMDB-DB02 ~]# pvdisplay
- - - Physical volume ---
PV Name /dev/sda2
VG Name centos_mb-centos7
PV Size 49.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 12674
Free PE 10
Allocated PE 12664
PV UUID 8WbgjB-T1Lf-kqUD-qPFw-UwJu-B9Lc-GAUTUB
" /dev/sdb1" is a newphysical volume of"100.00 GiB"--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 100.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID HOknRs-TnMy-wtfX-sGqD-5RK9-dk9q-ze13fj
[ root@DEV-CMDB-DB02 ~]# vgdisplay
- - - Volume group ---
VG Name centos_mb-centos7
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 49.51 GiB
PE Size 4.00 MiB
Total PE 12674
Alloc PE / Size 12664/49.47 GiB
Free PE / Size 10/40.00 MiB
VG UUID aN2D2P-Rk1y-wGFz-5l2I-5CcD-7s88-Z8czc7
step6。新しく追加されたパーティション/ dev / sdb1をルートディレクトリパーティションcentos_mb-centos7に追加します
[ root@DEV-CMDB-DB02 ~]# vgextend centos_mb-centos7 /dev/sdb1
Volume group "centos_mb-centos7" successfully extended
step7。ボリュームグループ情報を確認します
[ root@DEV-CMDB-DB02 ~]# vgdisplay
- - - Volume group ---
VG Name centos_mb-centos7
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 149.50 GiB
PE Size 4.00 MiB
Total PE 38273
Alloc PE / Size 12664/49.47 GiB
Free PE / Size 25609/100.04 GiB
VG UUID aN2D2P-Rk1y-wGFz-5l2I-5CcD-7s88-Z8czc7
step9。ボリューム拡張を実行します
[ root@DEV-CMDB-DB02 ~]# lvextend -l +100%FREE /dev/mapper/centos_mb--centos7-root
Size of logical volume centos_mb-centos7/root changed from44.47GiB(11384 extents) to 144.50GiB(36993 extents).
Logical volume root successfully resized.
step10。ボリュームパーティションサイズを調整します
[ root@DEV-CMDB-DB02 ~]# xfs_growfs /dev/mapper/centos_mb--centos7-root
meta-data=/dev/mapper/centos_mb--centos7-root isize=256 agcount=4, agsize=2914304 blks
= sectsz=512 attr=2, projid32bit=1= crc=0 finobt=0
data = bsize=4096 blocks=11657216, imaxpct=25= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=5692, version=2= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from11657216 to 37880832
最後に、ディスク情報を確認すると、ルートディレクトリのパーティションサイズが正常に拡張されていることがわかります。
[ root@DEV-CMDB-DB02 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos_mb--centos7-root 145G 9.8G 135G 7% /
devtmpfs 5.9G 05.9G 0%/dev
tmpfs 5.9G 84K 5.9G 1%/dev/shm
tmpfs 5.9G 8.9M 5.9G 1%/run
tmpfs 5.9G 05.9G 0%/sys/fs/cgroup
/dev/sda1 497M 142M 356M 29%/boot
tmpfs 1.2G 16K 1.2G 1%/run/user/42
tmpfs 1.2G 01.2G 0%/run/user/0