EXSI6.7磁盘扩容
注意：扩容磁盘的方式分为 [添加磁盘]、[扩展磁盘] ;
添加磁盘-在线增加
进入EXSI管理平台，看到原来的硬盘只有一块，点击 添加硬盘-新标准硬盘
确认添加状态
登陆机器，查看磁盘，发现多了一块sdb
# 新增硬盘前
[root@master-node ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 99G 0 part
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 7.9G 0 lvm [SWAP]
└─centos-home 253:2 0 41.1G 0 lvm /home
sr0 11:0 1 1024M 0 rom
# 新增硬盘后
[root@master-node ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 99G 0 part
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 7.9G 0 lvm [SWAP]
└─centos-home 253:2 0 41.1G 0 lvm /home
sdb 8:16 0 50G 0 disk
sr0 11:0 1 1024M 0 rom
或者使用fdisk确认磁盘空间是否已经扩展
[root@master-node ~]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
·········
Disk /dev/sdb: 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
扩展分区
[root@master-node ~]# 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 new DOS disklabel with disk identifier 0x7f92d23a.
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, default 1):
First sector (2048-104857599, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599):
Using default value 104857599
Partition 1 of type Linux and of size 50 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks
使用lsblk或者fdisk命令 再次查看磁盘，发现多了个sdb1
[root@master-node ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 99G 0 part
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 7.9G 0 lvm [SWAP]
└─centos-home 253:2 0 41.1G 0 lvm /home
sdb 8:16 0 50G 0 disk
└─sdb1 8:17 0 50G 0 part
sr0 11:0 1 1024M 0 rom
# 或者fdisk命令
[root@master-node ~]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
·········
Disk /dev/sdb: 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 label type: dos
Disk identifier: 0x7f92d23a
Device Boot Start End Blocks Id System
/dev/sdb1 2048 104857599 52427776 83 Linux
硬盘格式化
格式化硬盘，这里使用xfs格式，建议使用和系统一样的文件格式
可以看到/分区 【/dev/mapper/centos-root】 使用的是xfs 的文件系统
[root@master-node ~]# blkid
/dev/sda1: UUID="80258da0-bb03-42f4-abaf-580ad558de6f" TYPE="xfs"
/dev/sda2: UUID="kWBKkc-iH5s-m1wm-56s6-3md0-eY9F-77RFpW" TYPE="LVM2_member"
/dev/mapper/centos-root: UUID="bda3808d-ebe7-47e8-b093-47be3bad0c20" TYPE="xfs"
/dev/mapper/centos-swap: UUID="e1df6176-5508-49a7-8ba2-9ff25248298c" TYPE="swap"
/dev/mapper/centos-home: UUID="30c12979-6fc4-47c0-afd8-825eca9bb0f7" TYPE="xfs"
把/dev/sdb1 格式化成 xfs文件系统
[root@master-node ~]# mkfs.xfs /dev/sdb1
meta-data=/dev/sdb1 isize=512 agcount=4, agsize=3276736 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=13106944, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=6399, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
# 看到/dev/sdb1 的文件系统为 xfs
[root@master-node ~]# blkid
/dev/sda1: UUID="80258da0-bb03-42f4-abaf-580ad558de6f" TYPE="xfs"
/dev/sda2: UUID="kWBKkc-iH5s-m1wm-56s6-3md0-eY9F-77RFpW" TYPE="LVM2_member"
/dev/mapper/centos-root: UUID="bda3808d-ebe7-47e8-b093-47be3bad0c20" TYPE="xfs"
/dev/mapper/centos-swap: UUID="e1df6176-5508-49a7-8ba2-9ff25248298c" TYPE="swap"
/dev/mapper/centos-home: UUID="30c12979-6fc4-47c0-afd8-825eca9bb0f7" TYPE="xfs"
/dev/sdb1: UUID="cb155145-5841-473c-980e-7571bd346a01" TYPE="xfs"
Lvm扩容
创建pv物理卷
[root@master-node ~]# pvcreate /dev/sdb1
WARNING: xfs signature detected on /dev/sdb1 at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/sdb1.
Physical volume "/dev/sdb1" successfully created.
查看pv物理卷，查看vg卷组名称为centos（或者使用vgdisplay）
[root@master-node ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <99.00g 4.00m
/dev/sdb1 lvm2 --- <50.00g <50.00g
[admin@localhost ~]$ vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 3 0 wz--n- <59.00g 0
# 使用其他命令，同样vg name为centos
[root@master-node ~]# vgdisplay
--- Volume group ---
VG Name centos
·········
VG Size <99.00 GiB
PE Size 4.00 MiB
Total PE 25343
Alloc PE / Size 25342 / 98.99 GiB
Free PE / Size 1 / 4.00 MiB
VG UUID yTqRKf-eSrx-KgEe-D34S-U9vX-lhGf-UfnW2p
向vg卷组添加 pv物理卷sdb1
[root@master-node ~]# vgextend centos /dev/sdb1
Volume group "centos" successfully extended
可发现空闲PE，容量大约50G
[root@master-node ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 3 0 wz--n- 148.99g 50.00g
[root@master-node ~]# vgdisplay
--- Volume group ---
VG Name centos
·········
VG Size 148.99 GiB
PE Size 4.00 MiB
Total PE 38142
Alloc PE / Size 25342 / 98.99 GiB
Free PE / Size 12800 / 50.00 GiB
VG UUID yTqRKf-eSrx-KgEe-D34S-U9vX-lhGf-UfnW2p
扩展lv
通过lvs或者lvdisplay 可以看到分区的lv名称为 root
[root@master-node ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home centos -wi-ao---- <41.12g
root centos -wi-ao---- 50.00g
swap centos -wi-ao---- <7.88g
[root@master-node ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
······
--- Logical volume ---
LV Path /dev/centos/home
······
--- Logical volume ---
LV Path /dev/centos/root
······
我们把新扩展的50G全部添加到centos-root中
[root@master-node ~]# lvextend /dev/mapper/centos-root /dev/sdb1
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to <100.00 GiB (25599 extents).
Logical volume centos/root successfully resized.
使用lvs或者lsblk可以看到空间已经增加上了，但是df-h并没有变化 可选择重启或者刷新文件系统
[root@master-node ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home centos -wi-ao---- <41.12g
root centos -wi-ao---- <100.00g
swap centos -wi-ao---- <7.88g
[root@master-node ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 99G 0 part
├─centos-root 253:0 0 100G 0 lvm /
├─centos-swap 253:1 0 7.9G 0 lvm [SWAP]
└─centos-home 253:2 0 41.1G 0 lvm /home
sdb 8:16 0 50G 0 disk
└─sdb1 8:17 0 50G 0 part
└─centos-root 253:0 0 100G 0 lvm /
sr0 11:0 1 1024M 0 rom
[root@master-node ~]# df -klh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 1.4G 49G 3% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 1014M 145M 870M 15% /boot
/dev/mapper/centos-home 42G 33M 42G 1% /home
tmpfs 783M 0 783M 0% /run/user/0
刷新文件系统
[root@master-node ~]# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos-root xfs 52403200 1417504 50985696 3% /
devtmpfs devtmpfs 3992520 0 3992520 0% /dev
tmpfs tmpfs 4004596 0 4004596 0% /dev/shm
tmpfs tmpfs 4004596 9052 3995544 1% /run
tmpfs tmpfs 4004596 0 4004596 0% /sys/fs/cgroup
/dev/sda1 xfs 1038336 148404 889932 15% /boot
/dev/mapper/centos-home xfs 43093444 32992 43060452 1% /home
tmpfs tmpfs 800920 0 800920 0% /run/user/0
[root@master-node ~]# 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 26213376
# 新增的50G磁盘已经有效
[root@master-node ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 100G 1.4G 99G 2% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 1014M 145M 870M 15% /boot
/dev/mapper/centos-home 42G 33M 42G 1% /home
tmpfs 783M 0 783M 0% /run/user/0
扩展磁盘-关机增加
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，比如之前是60G，希望扩展200G，那么我们应该输入200G。这里我们以扩展磁盘的方式进行。
确认添加状态
扩展后，重新启动linux，使用df -kh命令发现磁盘目录大小没有变化
[admin@localhost ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 36G 1.6G 35G 5% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 1014M 189M 826M 19% /boot
/dev/mapper/centos-home 18G 33M 18G 1% /home
tmpfs 783M 0 783M 0% /run/user/0
tmpfs 783M 0 783M 0% /run/user/1001
使用fdisk确认磁盘空间是否已经扩展
[admin@localhost ~]$ fdisk -l
Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 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: 0x0005871c
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 125829119 61864960 8e Linux LVM
Disk /dev/mapper/centos-root: 38.2 GB, 38235275264 bytes, 74678272 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: 6442 MB, 6442450944 bytes, 12582912 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: 18.7 GB, 18668847104 bytes, 36462592 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
可以看到“Disk /dev/sda: 214.7 GB”，已经扩展了140G空间。
扩展分区
[admin@localhost ~]$ 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 (125829120-419430399, default 125829120):
Using default value 125829120
Last sector, +sectors or +size{K,M,G} (125829120-419430399, default 419430399):
Using default value 419430399
Partition 3 of type Linux and of size 140 GiB is set
Command (m for help): t
Partition number (1-3, default 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 Extd (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.
加载分区表
方法一：（推荐）
[root@localhost ~]# partprobe
执行 partprobe命令用于将磁盘分区表变化信息通知内核，并请求操作系统重新加载分区表，此方法可以不用重启系统；
方法二：重启系统
[root@localhost ~]# reboot
分区确认
通过fdisk可以看到已经添加了/dev/sda3
[admin@localhost ~]$ fdisk -l
Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 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: 0x0005871c
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 125829119 61864960 8e Linux LVM
/dev/sda3 125829120 419430399 146800640 8e Linux LVM
Disk /dev/mapper/centos-root: 38.2 GB, 38235275264 bytes, 74678272 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: 6442 MB, 6442450944 bytes, 12582912 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: 18.7 GB, 18668847104 bytes, 36462592 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
LVM扩容
创建pv物理卷
[admin@localhost ~]$ pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created.
查看pv物理卷
[root@master-node ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <99.00g 4.00m
/dev/sda3 lvm2 --- <50.00g <50.00g
使用vgs查看
[admin@localhost ~]$ vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 3 0 wz--n- <59.00g 0
把sda3加入到LVM组中 注意：centos 是vg组名称，请根据具体情况填写
[admin@localhost ~]$ vgextend centos /dev/sda3
Volume group "centos" successfully extended
查看发现磁盘空余大约140G
[admin@localhost ~]$ vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 3 0 wz--n- 198.99g <140.00g
扩展lv
我们把新扩展的100G全部添加到centos-root中
[admin@localhost ~]$ lvextend /dev/mapper/centos-root /dev/sda3
Size of logical volume centos/root changed from <35.61 GiB (9116 extents) to <175.61 GiB (44955 extents).
Logical volume centos/root successfully resized.
使用lvs可以看到 centos-root 已经是140G了，但是…请继续往下看
[admin@localhost ~]$ lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home centos -wi-ao---- <17.39g
root centos -wi-ao---- <175.61g
swap centos -wi-ao---- 6.00g
使用df -kh查看，空间并没有变化，look down… 可选择重启或者刷新文件系统
[admin@localhost ~]$ df -khl
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 36G 1.6G 35G 5% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 1014M 189M 826M 19% /boot
/dev/mapper/centos-home 18G 33M 18G 1% /home
tmpfs 783M 0 783M 0% /run/user/1001
刷新文件系统
[admin@localhost ~]$ df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos-root xfs 37320904 1616800 35704104 5% /
devtmpfs devtmpfs 3992828 0 3992828 0% /dev
tmpfs tmpfs 4004744 0 4004744 0% /dev/shm
tmpfs tmpfs 4004744 9036 3995708 1% /run
tmpfs tmpfs 4004744 0 4004744 0% /sys/fs/cgroup
/dev/sda1 xfs 1038336 192612 845724 19% /boot
/dev/mapper/centos-home xfs 18221056 33020 18188036 1% /home
tmpfs tmpfs 800952 0 800952 0% /run/user/1001
[admin@localhost ~]$ xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=2333696 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=9334784, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=4558, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 9334784 to 46033920
# 再次确认df状态, 添加的100G空间已经有效
[admin@localhost ~]$ df -kh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 176G 1.6G 175G 1% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 1014M 189M 826M 19% /boot
/dev/mapper/centos-home 18G 33M 18G 1% /home
tmpfs 783M 0 783M 0% /run/user/1001
转移磁盘
从CentOS7默认安装的/home中转移空间到根目录
mkdir /backup
mv /home/* /backup/
umount /home
lvremove /dev/centos/home
lvcreate -L 50G -n home centos # home目录留下50G
mkfs -t xfs /dev/centos/home
mount /dev/centos/home /home
mv /backup/* /home/
lvextend -L +42G /dev/centos/root # 将新增42G到root
xfs_growfs /dev/centos/root
rm -rf /backup
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