三丰云系统盘扩展空间的教程
我是买的终身会员，系统盘可惜只赠送了12G，现在严重不够用了，如下图所示：其实是可以扩展的，但扩展目录需要是没有分配的空间，这就要求我们在初始化服务器后重装系统，先从数据盘空间扩展系统盘，然后再挂载数据盘。
centos7下扩展根分区教程如下：
centos7下扩展根分区（图文详解） - 免费云服务器 _ 帮助与文档 _ 三丰云
1、查看磁盘：
fdisk -l2、分区：
fdisk /dev/sdb输出：
# 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 0x49b45401.
The device presents a logical sector size that is smaller than
the physical sector size. Aligning to a physical sector (or optimal
I/O) size boundary is recommended, or performance may be impacted.
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): 1
First sector (2048-209715199, default 2048): +30G
Last sector, +sectors or +size{K,M,G} (62914560-209715199, default 209715199):
Using default value 209715199
Partition 1 of type Linux and of size 70 GiB is set
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (2-4, default 2): 2
First sector (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-62914559, default 62914559):
Using default value 62914559
Partition 2 of type Linux and of size 30 GiB is set再次输入p查看：
Command (m for help): p
Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x49b45401
Device Boot Start End Blocks IdSystem
/dev/sdb1 62914560 209715199 73400320 83Linux
/dev/sdb2 2048 62914559 31456256 83Linux
Partition table entries are not in disk order
然后输入w保存：
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.继续按照三丰云的教程输入vgdisplay -v命令：
# vgdisplay -v
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No3
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 <14.00 GiB
PE Size 4.00 MiB
Total PE 3583
Alloc PE / Size 3583 / <14.00 GiB
FreePE / Size 0 / 0
VG UUID 5hlfxw-ZrTw-4lfk-qYgI-5xl7-bKn0-H1u47h
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID O55Fu9-JV6O-xv1J-hHVp-fqdO-XOP6-6gZOYN
LV Write Access read/write
LV Creation host, time localhost, 2022-05-10 07:54:40 -0400
LV Status available
# open 2
LV Size 1.50 GiB
Current LE 384
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID cl6mgF-6vay-zqF4-qBhK-3DB5-sUZB-wc7rMf
LV Write Access read/write
LV Creation host, time localhost, 2022-05-10 07:54:41 -0400
LV Status available
# open 1
LV Size <12.50 GiB
Current LE 3199
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
--- Physical volumes ---
PV Name /dev/sda2
PV UUID TuE61G-54Ld-ocG4-zZHX-cQ1G-fiGj-EUesBL
PV Status allocatable
Total PE / Free PE 3583 / 0
继续为/dev/sdb1和/dev/sdb2创建物理卷：
# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created.
# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <14.00 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 3583
Free PE 0
Allocated PE 3583
PV UUID TuE61G-54Ld-ocG4-zZHX-cQ1G-fiGj-EUesBL
"/dev/sdb1" is a new physical volume of "70.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 70.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID INW6T0-4iPa-4FoY-VJT1-QlDP-AfjP-wn0EfA
# pvcreate /dev/sdb2
Physical volume "/dev/sdb2" successfully created.
# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <14.00 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 3583
Free PE 0
Allocated PE 3583
PV UUID TuE61G-54Ld-ocG4-zZHX-cQ1G-fiGj-EUesBL
"/dev/sdb1" is a new physical volume of "70.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 70.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID INW6T0-4iPa-4FoY-VJT1-QlDP-AfjP-wn0EfA
"/dev/sdb2" is a new physical volume of "<30.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb2
VG Name
PV Size <30.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID MOOZ7E-soPj-h6aa-yqCm-KoCJ-9Wee-aV9BfU
# vgextend centos /dev/sdb2
Volume group "centos" successfully extended
# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID O55Fu9-JV6O-xv1J-hHVp-fqdO-XOP6-6gZOYN
LV Write Access read/write
LV Creation host, time localhost, 2022-05-10 07:54:40 -0400
LV Status available
# open 2
LV Size 1.50 GiB
Current LE 384
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID cl6mgF-6vay-zqF4-qBhK-3DB5-sUZB-wc7rMf
LV Write Access read/write
LV Creation host, time localhost, 2022-05-10 07:54:41 -0400
LV Status available
# open 1
LV Size <12.50 GiB
Current LE 3199
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
# lvextend -L +30G /dev/centos/root
Insufficient free space: 7680 extents needed, but only 7679 available
# lvextend -L +29.9G /dev/centos/root
Rounding size to boundary between physical extents: 29.90 GiB.
Size of logical volume centos/root changed from <12.50 GiB (3199 extents) to <42.40 GiB (10854 extents).
Logical volume centos/root successfully resized.
# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=818944 blks
= sectsz=4096attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=3275776, 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=4096sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 3275776 to 11114496
# df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/centos-root 43G1.3G 42G 4% /
devtmpfs 3.9G 03.9G 0% /dev
tmpfs 3.9G 03.9G 0% /dev/shm
tmpfs 3.9G8.7M3.9G 1% /run
tmpfs 3.9G 03.9G 0% /sys/fs/cgroup
/dev/sda1 1014M145M870M15% /boot
tmpfs 782M 0782M 0% /run/user/0
# 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 / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x49b45401
Device Boot Start End Blocks IdSystem
/dev/sdb1 62914560 209715199 73400320 83Linux
/dev/sdb2 2048 62914559 31456256 83Linux
Partition table entries are not in disk order
Disk /dev/sda: 16.1 GB, 16106127360 bytes, 31457280 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x00077442
Device Boot Start End Blocks IdSystem
/dev/sda1 * 2048 2099199 1048576 83Linux
/dev/sda2 2099200 31457279 14679040 8eLinux LVM
Disk /dev/mapper/centos-root: 45.5 GB, 45524975616 bytes, 88915968 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/mapper/centos-swap: 1610 MB, 1610612736 bytes, 3145728 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
格式化/dev/sdb1，将数据盘剩余的/dev/sdb1挂载的data目录：
# mkfs -t ext4 -c /dev/sdb1
mke2fs 1.42.9 (28-Dec-2013)
Discarding device blocks: done
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
4587520 inodes, 18350080 blocks
917504 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2166358016
560 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Checking for bad blocks (read-only test): done
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done 创建data目录：
# mkdir -p /data
# mount /dev/sdb1 /data根据linux数据库开启自动挂载配置指令 - 开发技术 - 寿光赢创志诚信息技术有限公司 - Powered by Discuz!
设置开机自动挂载数据盘。
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