centos 根目录扩容
<ol start="0"><li>添加一块磁盘<br>
参考上一篇博文VMware Workstation 添加磁盘 挂载目录(centos)</li>
</ol>
<hr>
<ol>
<li>查看当前磁盘挂载情况</li>
</ol>
<pre><code># fdisk -l
Disk /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 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: 0x000bd826
Device Boot Start End Blocks IdSystem
/dev/sda1 * 2048 2099199 1048576 83Linux
/dev/sda2 20992001048575999 523238400 8eLinux LVM
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: 0x2890866a
Device Boot Start End Blocks IdSystem
/dev/sdb1 2048 209715199 104856576 83Linux
Disk /dev/sdc: 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 /dev/mapper/centos-root: 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 /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 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: 480.0 GB, 479954206720 bytes, 937410560 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
</code></pre>
<hr>
<ol start="2">
<li>磁盘分区</li>
</ol>
<pre><code># fdisk /dev/sdc //选择操作的磁盘
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 0xb9ce2594.
Command (m for help): p//查看磁盘分区情况（当前未分区）
Disk /dev/sdc: 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: 0xb9ce2594
Device Boot Start End Blocks IdSystem
Command (m for help): n //重新分区
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p//主分区
Partition number (1-4, default 1)://主分区编号 默认即可
First sector (2048-209715199, default 2048)://主分区开始扇区 默认即可
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199)://主分区结束扇区 默认即可
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
Command (m for help): t //更改分区的系统id
Selected partition 1
Hex code (type L to list all codes): L
0Empty 24NEC DOS 81Minix / old Lin bfSolaris
1FAT12 27Hidden NTFS Win 82Linux swap / So c1DRDOS/sec (FAT-
2XENIX root 39Plan 9 83Linux c4DRDOS/sec (FAT-
3XENIX usr 3cPartitionMagic84OS/2 hidden C:c6DRDOS/sec (FAT-
4FAT16 <32M 40Venix 80286 85Linux extendedc7Syrinx
5Extended 41PPC PReP Boot 86NTFS volume set daNon-FS data
6FAT16 42SFS 87NTFS volume set dbCP/M / CTOS / .
7HPFS/NTFS/exFAT 4dQNX4.x 88Linux plaintext deDell Utility
8AIX 4eQNX4.x 2nd part 8eLinux LVM dfBootIt
9AIX bootable 4fQNX4.x 3rd part 93Amoeba e1DOS access
aOS/2 Boot Manag 50OnTrack DM 94Amoeba BBT e3DOS R/O
bW95 FAT32 51OnTrack DM6 Aux 9fBSD/OS e4SpeedStor
cW95 FAT32 (LBA) 52CP/M a0IBM Thinkpad hi ebBeOS fs
eW95 FAT16 (LBA) 53OnTrack DM6 Aux a5FreeBSD eeGPT
fW95 Ext'd (LBA) 54OnTrackDM6 a6OpenBSD efEFI (FAT-12/16/
10OPUS 55EZ-Drive a7NeXTSTEP f0Linux/PA-RISC b
11Hidden FAT12 56Golden Bow a8Darwin UFS f1SpeedStor
12Compaq diagnost 5cPriam Edisk a9NetBSD f4SpeedStor
14Hidden FAT16 <3 61SpeedStor abDarwin boot f2DOS secondary
16Hidden FAT16 63GNU HURD or Sys afHFS / HFS+ fbVMware VMFS
17Hidden HPFS/NTF 64Novell Netwareb7BSDI fs fcVMware VMKCORE
18AST SmartSleep65Novell Netwareb8BSDI swap fdLinux raid auto
1bHidden W95 FAT3 70DiskSecure Mult bbBoot Wizard hid feLANstep
1cHidden W95 FAT3 75PC/IX beSolaris boot ffBBT
1eHidden W95 FAT1 80Old Minix
Hex code (type L to list all codes): 8e //选择8e（lvm）
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p//查看分区情况
Disk /dev/sdc: 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: 0xb9ce2594
Device Boot Start End Blocks IdSystem
/dev/sdc1 2048 209715199 104856576 8eLinux LVM
Command (m for help): w //保存
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
</code></pre>
<hr>
<ol start="3">
<li>创建物理卷</li>
</ol>
<pre><code># pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created.
# pvdisplay// 查看物理卷信息
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <499.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 127743
Free PE 1
Allocated PE 127742
PV UUID 3ajula-aPHg-hffV-1iC5-N7yq-aQjk-wVze0M
"/dev/sdc1" is a new physical volume of "<100.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdc1
VG Name
PV Size <100.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID w2DoiS-Vvz7-jm0E-ofTL-mebV-9d9E-PYwa8s
# vgdisplay // 查看物理卷信息
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size <499.00 GiB
PE Size 4.00 MiB
Total PE 127743
Alloc PE / Size 127742 / 498.99 GiB
FreePE / Size 1 / 4.00 MiB //此时没有扩展内存
VG UUID X10fAx-IgS1-V7fr-1VSd-jzjT-4ufc-mxD24J
</code></pre>
<hr>
<ol start="4">
<li>将新增加的分区/dev/sdc1加入到根目录分区centos中</li>
</ol>
<pre><code># vgextend centos /dev/sdc1
Volume group "centos" successfully extended
# vgdisplay// 查看物理卷信息
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 2
Act PV 2
VG Size 598.99 GiB
PE Size 4.00 MiB
Total PE 153342
Alloc PE / Size 127742 / 498.99 GiB
FreePE / Size 25600 / 100.00 GiB//此时扩展内存为100G
VG UUID X10fAx-IgS1-V7fr-1VSd-jzjT-4ufc-mxD24J
</code></pre>
<hr>
<ol start="5">
<li>进行卷扩容</li>
</ol>
<pre><code># lvextend -l +100%FREE /dev/mapper/centos-root
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 150.00 GiB (38400 extents).
</code></pre>
<hr>
<ol start="6">
<li>调整卷分区大小</li>
</ol>
<pre><code># 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 39321600
</code></pre>
<hr>
<ol start="7">
<li>查看扩容结果</li>
</ol>
<pre><code># df -Th
Filesystem Type SizeUsed Avail Use% Mounted on
/dev/mapper/centos-root xfs 150G 49G102G33% / //扩容成功
devtmpfs devtmpfs3.8G 03.8G 0% /dev
tmpfs tmpfs 3.9G 03.9G 0% /dev/shm
tmpfs tmpfs 3.9G 12M3.8G 1% /run
tmpfs tmpfs 3.9G 03.9G 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M142M873M14% /boot
/dev/mapper/centos-home xfs 447G1.2G446G 1% /home
tmpfs tmpfs 781M 0781M 0% /run/user/0
</code></pre>
<p>此文为本人原创文章，转载请注明出处！！！</p><br><br>
来源：https://www.cnblogs.com/lillcol/p/11452915.html
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