Linux磁盘扩容基本步骤
1. 先查看服务器上的磁盘信息df -h,fdisk -l
注意:我们要扩展的是home目录
[root@ftp ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 10G 2.2G 7.9G 22% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 193M 1.7G 11% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/rhel-home 106G 90G 16G 85% /home
/dev/sda1 497M 124M 373M 25% /boot
tmpfs 380M 0 380M 0% /run/user/0
[root@ftp ~]# fdisk -l
Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x0000fc9e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 251658239 125316096 8e Linux LVM
Disk /dev/mapper/rhel-root: 10.7 GB, 10737418240 bytes, 20971520 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/rhel-swap: 4294 MB, 4294967296 bytes, 8388608 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/rhel-home: 113.3 GB, 113283956736 bytes, 221257728 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
2. 添加服务器磁盘
- 如果是虚拟机,就直接添加一块硬盘
- 如果是磁盘阵列,就直接映射
- 如果是云主机,也直接加一块硬盘
在线加完硬盘之后,需要重新扫描磁盘才能看到新增的那块磁盘,命令如下:
echo "- - -" > /sys/class/scsi_host/host1/scan
注意:/sys/class/scsi_host/目录下可能会有多个host文件,如果扫描其中一个没有生效,
可以继续扫描其他的,直至生效为止
下面是加了一个100G硬盘之后的:
[root@ftp ~]# fdisk -l
Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x0000fc9e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 251658239 125316096 8e Linux LVM
Disk /dev/mapper/rhel-root: 10.7 GB, 10737418240 bytes, 20971520 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/rhel-swap: 4294 MB, 4294967296 bytes, 8388608 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/rhel-home: 113.3 GB, 113283956736 bytes, 221257728 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
# 这一块硬盘是新增的/dev/sdb,虽然新增的是100G,这里显示107.4G,这是系统和虚拟机的计算方式问题,没关系
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
3.开始扩展
1. 将/dev/sdb 创建新的分区
[root@ftp ~]# fdisk /dev/sdb
# 新建分区
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
# 直接Enter 使用默认选项
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199):
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
# 写入并保存退出
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@ftp ~]# fdisk -l
....
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: 0x647aa105
# 会看到这里有个新增的分区
Device Boot Start End Blocks Id System
/dev/sdb1 2048 209715199 104856576 83 Linux
2. 创建pv
[root@ftp ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
[root@ftp ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 rhel lvm2 a-- 119.51g 4.00m
/dev/sdb1 lvm2 --- 100.00g 100.00g # 新增的
3. 扩展vg
[root@ftp ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 1 3 0 wz--n- 119.51g 4.00m # 之前的大小
[root@ftp ~]# vgextend rhel /dev/sdb1
Volume group "rhel" successfully extended
[root@ftp ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 2 3 0 wz--n- 219.50g 100.00g #扩展后的大小
4. 扩展lv
[root@ftp ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home rhel -wi-ao---- 105.50g #之前的大小
root rhel -wi-ao---- 10.00g
swap rhel -wi-ao---- 4.00g
[root@ftp ~]# lvextend -L+95G /dev/rhel/home
Size of logical volume rhel/home changed from 105.50 GiB (27009 extents) to 200.50 GiB (51329 extents).
Logical volume home successfully resized.
[root@ftp ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home rhel -wi-ao---- 200.50g #扩展后的大小
root rhel -wi-ao---- 10.00g
swap rhel -wi-ao---- 4.00g
5. 扩展后,不能直接使用,需要重新检查再调整磁盘大小
[root@ftp ~]# e2fsck -f /dev/rhel/home
e2fsck 1.42.9 (28-Dec-2013)
/dev/rhel/home is mounted.
e2fsck: Cannot continue, aborting.
[root@ftp ~]# resize2fs /dev/rhel/home
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/rhel/home
Couldn't find valid filesystem superblock.
# 使用上面两个命令会发现有问题,原因是/dev/mapper/rhel-home分区不是ex格式的,需要使用下面的方法
↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
[root@ftp ~]# cat /etc/fstab | grep home
/dev/mapper/rhel-home /home xfs defaults 0 0
[root@ftp ~]# xfs_growfs /dev/rhel/home
meta-data=/dev/mapper/rhel-home isize=256 agcount=4, agsize=6914304 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=27657216, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=13504, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 27657216 to 52560896
[root@ftp ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 10G 2.2G 7.9G 22% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 193M 1.7G 11% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/rhel-home 201G 90G 111G 45% /home # 扩展磁盘成功
/dev/sda1 497M 124M 373M 25% /boot
tmpfs 380M 0 380M 0% /run/user/0
4.总结所有命令
echo "- - -" > /sys/class/scsi_host/host1/scan
fdisk /dev/sdb → n → 一直回车,最后w保存
pvcreate /dev/sdb1
vgextend rhel /dev/sdb1
lvextend -L+95G /dev/rhel/home
xfs_growfs /dev/rhel/home # xfs格式的
resize2fs /dev/rhel/home # ext格式的
df -h # 查看最终结果
注意:我们要扩展的是home目录
[root@ftp ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 10G 2.2G 7.9G 22% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 193M 1.7G 11% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/rhel-home 106G 90G 16G 85% /home
/dev/sda1 497M 124M 373M 25% /boot
tmpfs 380M 0 380M 0% /run/user/0
[root@ftp ~]# fdisk -l
Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x0000fc9e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 251658239 125316096 8e Linux LVM
Disk /dev/mapper/rhel-root: 10.7 GB, 10737418240 bytes, 20971520 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/rhel-swap: 4294 MB, 4294967296 bytes, 8388608 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/rhel-home: 113.3 GB, 113283956736 bytes, 221257728 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
- 如果是虚拟机,就直接添加一块硬盘
- 如果是磁盘阵列,就直接映射
- 如果是云主机,也直接加一块硬盘
在线加完硬盘之后,需要重新扫描磁盘才能看到新增的那块磁盘,命令如下:
echo "- - -" > /sys/class/scsi_host/host1/scan
注意:/sys/class/scsi_host/目录下可能会有多个host文件,如果扫描其中一个没有生效,
可以继续扫描其他的,直至生效为止
下面是加了一个100G硬盘之后的:
[root@ftp ~]# fdisk -l
Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x0000fc9e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 251658239 125316096 8e Linux LVM
Disk /dev/mapper/rhel-root: 10.7 GB, 10737418240 bytes, 20971520 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/rhel-swap: 4294 MB, 4294967296 bytes, 8388608 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/rhel-home: 113.3 GB, 113283956736 bytes, 221257728 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
# 这一块硬盘是新增的/dev/sdb,虽然新增的是100G,这里显示107.4G,这是系统和虚拟机的计算方式问题,没关系
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
3.开始扩展
1. 将/dev/sdb 创建新的分区
[root@ftp ~]# fdisk /dev/sdb
# 新建分区
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
# 直接Enter 使用默认选项
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199):
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
# 写入并保存退出
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@ftp ~]# fdisk -l
....
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: 0x647aa105
# 会看到这里有个新增的分区
Device Boot Start End Blocks Id System
/dev/sdb1 2048 209715199 104856576 83 Linux
2. 创建pv
[root@ftp ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
[root@ftp ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 rhel lvm2 a-- 119.51g 4.00m
/dev/sdb1 lvm2 --- 100.00g 100.00g # 新增的
3. 扩展vg
[root@ftp ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 1 3 0 wz--n- 119.51g 4.00m # 之前的大小
[root@ftp ~]# vgextend rhel /dev/sdb1
Volume group "rhel" successfully extended
[root@ftp ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 2 3 0 wz--n- 219.50g 100.00g #扩展后的大小
4. 扩展lv
[root@ftp ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home rhel -wi-ao---- 105.50g #之前的大小
root rhel -wi-ao---- 10.00g
swap rhel -wi-ao---- 4.00g
[root@ftp ~]# lvextend -L+95G /dev/rhel/home
Size of logical volume rhel/home changed from 105.50 GiB (27009 extents) to 200.50 GiB (51329 extents).
Logical volume home successfully resized.
[root@ftp ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home rhel -wi-ao---- 200.50g #扩展后的大小
root rhel -wi-ao---- 10.00g
swap rhel -wi-ao---- 4.00g
5. 扩展后,不能直接使用,需要重新检查再调整磁盘大小
[root@ftp ~]# e2fsck -f /dev/rhel/home
e2fsck 1.42.9 (28-Dec-2013)
/dev/rhel/home is mounted.
e2fsck: Cannot continue, aborting.
[root@ftp ~]# resize2fs /dev/rhel/home
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/rhel/home
Couldn't find valid filesystem superblock.
# 使用上面两个命令会发现有问题,原因是/dev/mapper/rhel-home分区不是ex格式的,需要使用下面的方法
↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
[root@ftp ~]# cat /etc/fstab | grep home
/dev/mapper/rhel-home /home xfs defaults 0 0
[root@ftp ~]# xfs_growfs /dev/rhel/home
meta-data=/dev/mapper/rhel-home isize=256 agcount=4, agsize=6914304 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=27657216, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=13504, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 27657216 to 52560896
[root@ftp ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 10G 2.2G 7.9G 22% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 193M 1.7G 11% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/rhel-home 201G 90G 111G 45% /home # 扩展磁盘成功
/dev/sda1 497M 124M 373M 25% /boot
tmpfs 380M 0 380M 0% /run/user/0
4.总结所有命令
echo "- - -" > /sys/class/scsi_host/host1/scan
fdisk /dev/sdb → n → 一直回车,最后w保存
pvcreate /dev/sdb1
vgextend rhel /dev/sdb1
lvextend -L+95G /dev/rhel/home
xfs_growfs /dev/rhel/home # xfs格式的
resize2fs /dev/rhel/home # ext格式的
df -h # 查看最终结果
1. 将/dev/sdb 创建新的分区
[root@ftp ~]# fdisk /dev/sdb
# 新建分区
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
# 直接Enter 使用默认选项
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199):
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
# 写入并保存退出
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@ftp ~]# fdisk -l
....
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: 0x647aa105
# 会看到这里有个新增的分区
Device Boot Start End Blocks Id System
/dev/sdb1 2048 209715199 104856576 83 Linux
2. 创建pv
[root@ftp ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
[root@ftp ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 rhel lvm2 a-- 119.51g 4.00m
/dev/sdb1 lvm2 --- 100.00g 100.00g # 新增的
3. 扩展vg
[root@ftp ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 1 3 0 wz--n- 119.51g 4.00m # 之前的大小
[root@ftp ~]# vgextend rhel /dev/sdb1
Volume group "rhel" successfully extended
[root@ftp ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 2 3 0 wz--n- 219.50g 100.00g #扩展后的大小
4. 扩展lv
[root@ftp ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home rhel -wi-ao---- 105.50g #之前的大小
root rhel -wi-ao---- 10.00g
swap rhel -wi-ao---- 4.00g
[root@ftp ~]# lvextend -L+95G /dev/rhel/home
Size of logical volume rhel/home changed from 105.50 GiB (27009 extents) to 200.50 GiB (51329 extents).
Logical volume home successfully resized.
[root@ftp ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home rhel -wi-ao---- 200.50g #扩展后的大小
root rhel -wi-ao---- 10.00g
swap rhel -wi-ao---- 4.00g
5. 扩展后,不能直接使用,需要重新检查再调整磁盘大小
[root@ftp ~]# e2fsck -f /dev/rhel/home
e2fsck 1.42.9 (28-Dec-2013)
/dev/rhel/home is mounted.
e2fsck: Cannot continue, aborting.
[root@ftp ~]# resize2fs /dev/rhel/home
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/rhel/home
Couldn't find valid filesystem superblock.
# 使用上面两个命令会发现有问题,原因是/dev/mapper/rhel-home分区不是ex格式的,需要使用下面的方法
↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
[root@ftp ~]# cat /etc/fstab | grep home
/dev/mapper/rhel-home /home xfs defaults 0 0
[root@ftp ~]# xfs_growfs /dev/rhel/home
meta-data=/dev/mapper/rhel-home isize=256 agcount=4, agsize=6914304 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=27657216, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=13504, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 27657216 to 52560896
[root@ftp ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 10G 2.2G 7.9G 22% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 193M 1.7G 11% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/rhel-home 201G 90G 111G 45% /home # 扩展磁盘成功
/dev/sda1 497M 124M 373M 25% /boot
tmpfs 380M 0 380M 0% /run/user/0
echo "- - -" > /sys/class/scsi_host/host1/scan
fdisk /dev/sdb → n → 一直回车,最后w保存
pvcreate /dev/sdb1
vgextend rhel /dev/sdb1
lvextend -L+95G /dev/rhel/home
xfs_growfs /dev/rhel/home # xfs格式的
resize2fs /dev/rhel/home # ext格式的
df -h # 查看最终结果