linux 磁盘扩容实验
linux 磁盘扩容实验
实验前环境准备和思路
环境：
以下虚拟机做测试为例子（测试环境：虚拟机Oracle VM VirtualBox 6.1 ,虚拟机系统centos7.6 (最小化安装) ）， 查看我的虚拟机磁盘配置。
思路：
1.lvm下增加磁盘，扩容当前分区，或增加新的分区用于扩容。
2.非lvm下编辑磁盘大小，扩容分区。
我的实验环境磁盘配置如下操作：
[root@localhost ~]# df -Th Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/centos-root xfs 47G 1008M 46G 3% / devtmpfs devtmpfs 484M 0 484M 0% /dev tmpfs tmpfs 496M 0 496M 0% /dev/shm tmpfs tmpfs 496M 6.8M 489M 2% /run tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup /dev/sda1 xfs 1014M 133M 882M 14% /boot tmpfs tmpfs 100M 0 100M 0% /run/user/0 [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 50G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 49G 0 part ├─centos-root 253:0 0 47G 0 lvm / └─centos-swap 253:1 0 2G 0 lvm [SWAP] sr0 11:0 1 1024M 0 rom [root@localhost ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 centos lvm2 a-- <49.00g 4.00m [root@localhost ~]# vgs VG #PV #LV #SN Attr VSize VFree centos 1 2 0 wz--n- <49.00g 4.00m [root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root centos -wi-ao---- 46.99g swap centos -wi-ao---- 2.00g [root@localhost ~]#
我有一块磁盘sda为50G ，创建了一个物理卷，全部属于卷组VG centos 大小为49G，逻辑卷root，划分了47G，挂载到根分区。逻辑卷swap 为2G。
这里添加两块磁盘用于编辑和测试，虚拟机界面增加磁盘如下：
操作演示1
增加sdb20G磁盘，扩展根分区， 登陆系统，可看到新增两块未分区的磁盘，分别为sdb，sdc
Last login: Thu Jul 7 02:59:07 2022 from gateway [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 50G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 49G 0 part ├─centos-root 253:0 0 47G 0 lvm / └─centos-swap 253:1 0 2G 0 lvm [SWAP] sdb 8:16 0 20G 0 disk sdc 8:32 0 20G 0 disk sr0 11:0 1 1024M 0 rom [root@localhost ~]#
将磁盘sdb，扩展到根分区，
脚本解释：
pvcreate /dev/sdb 将磁盘加入物理卷
vgextend centos /dev/sdb 将磁盘加入卷组centos
lvextend -L +1g /dev/mapper/centos-root 扩展root卷，容量为1G 可看帮助命令 L后跟容量单位为G，M，
lvextend -l +100%free /dev/mapper/centos-root 扩展剩余全部空闲容量，l后跟百分比
xfs_growfs /dev/mapper/centos-root 扩展分区
操作步骤如下 ：
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 49G 0 part
├─centos-root 253:0 0 47G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 20G 0 disk
sdc 8:32 0 20G 0 disk
sr0 11:0 1 1024M 0 rom
[root@localhost ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created.
[root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 2 0 wz--n- <49.00g 4.00m
[root@localhost ~]# vgextend centos /dev/sdb
Volume group "centos" successfully extended
[root@localhost ~]# lvextend -L +1g /dev/mapper/centos-root
Size of logical volume centos/root changed from 46.99 GiB (12030 extents) to 47.99 GiB (12286 extents).
Logical volume centos/root successfully resized.
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3079680 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=12318720, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6015, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 12318720 to 12580864
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 48G 1007M 47G 3% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 49G 0 part
├─centos-root 253:0 0 48G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 20G 0 disk
└─centos-root 253:0 0 48G 0 lvm /
sdc 8:32 0 20G 0 disk
sr0 11:0 1 1024M 0 rom
[root@localhost ~]# lvextend -l +100%free /dev/mapper/centos-root
Size of logical volume centos/root changed from 47.99 GiB (12286 extents) to 66.99 GiB (17150 extents).
Logical volume centos/root successfully resized.
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=5, agsize=3079680 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=12580864, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6015, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 12580864 to 17561600
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 67G 1007M 66G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
[root@localhost ~]#
扩容完毕。
操作演示2
编辑sdb为40G，剩余容量扩展到根分区
(编辑磁盘大小后，执行pvresize 可看到vg中有空闲容量，执行lvextend扩展全部容量即可) 操作步骤如下
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 49G 0 part
├─centos-root 253:0 0 67G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 40G 0 disk
└─centos-root 253:0 0 67G 0 lvm /
sdc 8:32 0 40G 0 disk
└─data-lv0--data 253:2 0 20G 0 lvm
sr0 11:0 1 1024M 0 rom
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <49.00g 0
/dev/sdb centos lvm2 a-- <20.00g 0
/dev/sdc data lvm2 a-- <20.00g 0
[root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 2 0 wz--n- 68.99g 0
data 1 1 0 wz--n- <20.00g 0
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 66.99g
swap centos -wi-ao---- 2.00g
lv0-data data -wi-a----- <20.00g
[root@localhost ~]# pvresize /dev/sdb
Physical volume "/dev/sdb" changed
1 physical volume(s) resized or updated / 0 physical volume(s) not resized
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <49.00g 0
/dev/sdb centos lvm2 a-- <40.00g 20.00g
/dev/sdc data lvm2 a-- <20.00g 0
[root@localhost ~]#
[root@localhost ~]# lvextend -l +100%free /dev/mapper/centos-root
Size of logical volume centos/root changed from 66.99 GiB (17150 extents) to 86.99 GiB (22270 extents).
Logical volume centos/root successfully resized.
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=6, agsize=3079680 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=17561600, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6015, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 17561600 to 22804480
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 87G 1007M 86G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
[root@localhost ~]#
操作演示3
增加sdc20G磁盘，，扩展到/data分区，划分lvm操作脚本如下
[root@localhost ~]# pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created.
[root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 2 0 wz--n- 68.99g 0
[root@localhost ~]# vgcreate data /dev/sdc
Volume group "data" successfully created
[root@localhost ~]# lvcreate -l 100%free -n lv0-data data
Logical volume "lv0-data" created.
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 66.99g
swap centos -wi-ao---- 2.00g
lv0-data data -wi-a----- <20.00g
[root@localhost ~]# mkfs.xfs /dev/mapper/data-lv0--data
meta-data=/dev/mapper/data-lv0--data isize=512 agcount=4, agsize=1310464 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5241856, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@localhost ~]# mount /dev/mapper/data-lv0--data /data
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 67G 1007M 66G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
/dev/mapper/data-lv0--data xfs 20G 33M 20G 1% /data
[root@localhost ~]#
不划分lvm操作如下，（直接fdisk 进行分区，mkfs创建文件系统,创建目录进行挂载即可）
[root@localhost ~]# fdisk -l /dev/sdc
Disk /dev/sdc: 21.5 GB, 21474836480 bytes, 41943040 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
[root@localhost ~]# fdisk /dev/sdc
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 0x2102e59f.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039):
Using default value 41943039
Partition 1 of type Linux and of size 20 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost ~]# mkfs.
mkfs.btrfs mkfs.cramfs mkfs.ext2 mkfs.ext3 mkfs.ext4 mkfs.minix mkfs.xfs
[root@localhost ~]# mkfs.xfs /dev/sdc
sdc sdc1
[root@localhost ~]# mkfs.xfs /dev/sdc1
meta-data=/dev/sdc1 isize=512 agcount=4, agsize=1310656 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5242624, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@localhost ~]# mkdir /data
[root@localhost ~]# mount /dev/sdc1 /data
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 67G 1007M 66G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
/dev/sdc1 xfs 20G 33M 20G 1% /data
[root@localhost ~]#
操作演示4
编辑sdc为40G，剩余容量扩展到/data分区，(先对pv进行resize ，后看到vg中有空闲容量，执行lvextend进行扩容）
脚本演示如下
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 49G 0 part
├─centos-root 253:0 0 87G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 40G 0 disk
└─centos-root 253:0 0 87G 0 lvm /
sdc 8:32 0 40G 0 disk
└─data-lv0--data 253:2 0 20G 0 lvm
sr0 11:0 1 1024M 0 rom
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <49.00g 0
/dev/sdb centos lvm2 a-- <40.00g 0
/dev/sdc data lvm2 a-- <20.00g 0
[root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 2 0 wz--n- 88.99g 0
data 1 1 0 wz--n- <20.00g 0
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 86.99g
swap centos -wi-ao---- 2.00g
lv0-data data -wi-a----- <20.00g
[root@localhost ~]# pvresize /dev/sdc
Physical volume "/dev/sdc" changed
1 physical volume(s) resized or updated / 0 physical volume(s) not resized
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <49.00g 0
/dev/sdb centos lvm2 a-- <40.00g 0
/dev/sdc data lvm2 a-- <40.00g 20.00g
[root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 2 0 wz--n- 88.99g 0
data 1 1 0 wz--n- <40.00g 20.00g
[root@localhost ~]# lvextend -l +100%free /dev/mapper/data-lv0--data
Size of logical volume data/lv0-data changed from <20.00 GiB (5119 extents) to <40.00 GiB (10239 extents).
Logical volume data/lv0-data successfully resized.
[root@localhost ~]# xfs_growfs /dev/mapper/data-lv0--data
xfs_growfs: /dev/mapper/data-lv0--data is not a mounted XFS filesystem
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 87G 1007M 86G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
[root@localhost ~]# mount /dev/mapper/data-lv0--data /data
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 87G 1007M 86G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
/dev/mapper/data-lv0--data xfs 20G 33M 20G 1% /data
[root@localhost ~]# xfs_growfs /dev/mapper/data-lv0--data
meta-data=/dev/mapper/data-lv0--data isize=512 agcount=4, agsize=1310464 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=5241856, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 5241856 to 10484736
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 87G 1007M 86G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
/dev/mapper/data-lv0--data xfs 40G 33M 40G 1% /data
[root@localhost ~]#
扩容完毕。
操作演示5
增加一块20G磁盘，不使用lvm，直接分区挂载到/backup ,编辑磁盘大小为50G，进行扩容/backup 分区，（我这里基于上次磁盘新增，新增磁盘后盘符发生了改变，之前的sdc变成了sdd，新增的磁盘为sdc，直接将磁盘分区，创建文件系统，创建目录进行挂载即可）。
操作如下：
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 49G 0 part
├─centos-root 253:0 0 87G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 40G 0 disk
└─centos-root 253:0 0 87G 0 lvm /
sdc 8:32 0 20G 0 disk
sdd 8:48 0 40G 0 disk
└─data-lv0--data 253:2 0 40G 0 lvm
[root@localhost ~]# fdisk /dev/sdc
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 0x0fec34e6.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039):
Using default value 41943039
Partition 1 of type Linux and of size 20 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost ~]# mkfs.xfs /dev/sdc1
meta-data=/dev/sdc1 isize=512 agcount=4, agsize=1310656 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5242624, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@localhost ~]# mkdir /backup
[root@localhost ~]# mount /dev/sdc1 /backup/
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 87G 1007M 86G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
/dev/sdc1 xfs 20G 33M 20G 1% /backup
[root@localhost ~]#
新增磁盘已经被挂载到/backup ， 调整磁盘大小为50G,对分区进行扩容，（操作步骤，创建测试文件在backup目录下，使用fdisk 对磁盘进行删除原有分区，切记此时不要保存写入，在进行创建分区，此时的分区容量为50G，创建完毕写入即可，后执行partprobe ， xfs_growfs 即可）（虚拟机平台测试原有创建的数据都无问题）。
操作脚本如下
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 49G 0 part
├─centos-root 253:0 0 87G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 40G 0 disk
└─centos-root 253:0 0 87G 0 lvm /
sdc 8:32 0 50G 0 disk
└─sdc1 8:33 0 20G 0 part /backup
sdd 8:48 0 40G 0 disk
└─data-lv0--data 253:2 0 40G 0 lvm
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 87G 1007M 86G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
/dev/sdc1 xfs 20G 33M 20G 1% /backup
[root@localhost ~]#
[root@localhost ~]# touch /backup/000
[root@localhost ~]# touch /backup/111
[root@localhost ~]# touch /backup/222
[root@localhost ~]# echo "file is test" >> /backup/000
[root@localhost ~]# echo "file is test" >> /backup/111
[root@localhost ~]# echo "file is test" >> /backup/222
[root@localhost ~]# ls /backup/
000 111 222
[root@localhost ~]# ls /backup/ -l
total 12
-rw-r--r--. 1 root root 13 Jul 27 22:37 000
-rw-r--r--. 1 root root 13 Jul 27 22:37 111
-rw-r--r--. 1 root root 13 Jul 27 22:37 222
[root@localhost ~]# cat /backup/000
file is test
[root@localhost ~]#
[root@localhost ~]# fdisk /dev/sdc
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): p
Disk /dev/sdc: 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: 0x0fec34e6
Device Boot Start End Blocks Id System
/dev/sdc1 2048 41945087 20971520 83 Linux
Command (m for help): d
Selected partition 1
Partition 1 is deleted
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.
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.
[root@localhost ~]# partprobe
[root@localhost ~]# xfs_growfs /dev/sdc1
meta-data=/dev/sdc1 isize=512 agcount=4, agsize=1310720 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=5242880, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 5242880 to 13106944
[root@localhost ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 87G 1007M 86G 2% /
devtmpfs devtmpfs 484M 0 484M 0% /dev
tmpfs tmpfs 496M 0 496M 0% /dev/shm
tmpfs tmpfs 496M 6.8M 489M 2% /run
tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 133M 882M 14% /boot
tmpfs tmpfs 100M 0 100M 0% /run/user/0
/dev/sdc1 xfs 50G 33M 50G 1% /backup
[root@localhost ~]# ls /backup/
000 111 222
[root@localhost ~]# cat /backup/000
file is test
[root@localhost ~]# cat /backup/111
file is test
[root@localhost ~]# cat /backup/222
file is test
[root@localhost ~]#
此时非 lvm方式扩容完毕。
