centos7 分区扩容 （新增磁盘）

新增一块60G硬盘，根分区及data分区各增加30G空间

一、初始大小

[root@localhost ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
devtmpfs                devtmpfs  2.0G     0  2.0G   0% /dev
tmpfs                   tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                   tmpfs     2.0G   12M  2.0G   1% /run
tmpfs                   tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/mapper/centos-root xfs        40G  1.5G   38G   4% /
/dev/mapper/centos-data xfs        40G   33M   40G   1% /data
/dev/sda1               xfs       497M  143M  354M  29% /boot
tmpfs                   tmpfs     407M     0  407M   0% /run/user/0

二、查看卷名

[root@localhost ~]# vgdisplay |grep -E "VG Name"   也可以查看剩余空间，FREE SIZE一行中，这里就不写了
VG Name               centos

三、查看路径

[root@localhost ~]# lvdisplay |grep -E "LV Path"
LV Path                /dev/centos/swap
LV Path                /dev/centos/root
LV Path                /dev/centos/data

四、查看新增磁盘大小及名称，这里是/dev/sdb

[root@localhost ~]# fdisk -l /dev/sdb

Disk /dev/sdb: 64.4 GB, 64424509440 bytes, 125829120 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

五、格式化磁盘/dev/sdb

//这一步一般可以省略

[root@localhost ~]# mkfs.xfs /dev/sdb
meta-data=/dev/sdb               isize=512    agcount=4, agsize=3932160 blks
     =                       sectsz=512   attr=2, projid32bit=1
     =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=15728640, imaxpct=25
     =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=7680, version=2
     =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

六、/dev/sdb加入centos虚拟组

pvcreate /dev/sdb

vgextend centos /dev/sdb

[root@localhost ~]# pvcreate /dev/sdb
WARNING: xfs signature detected on /dev/sdb at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/sdb.
Physical volume "/dev/sdb" successfully created.

七、增加/data分区空间

[root@localhost ~]# lvextend -L +30G /dev/centos/data 
Size of logical volume centos/data changed from 39.46 GiB (10103 extents) to 69.46 GiB (17783
extents).
Logical volume centos/data successfully resized.

八、刷新,激活分区

[root@localhost ~]# xfs_growfs /dev/mapper/centos-data 
meta-data=/dev/mapper/centos-data isize=512    agcount=4, agsize=2586368 blks
     =                       sectsz=512   attr=2, projid32bit=1
     =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=10345472, imaxpct=25
     =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=5051, version=2
     =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 10345472 to 18209792

九、同上，增加/根分区空间

[root@localhost ~]# lvextend -L +30G /dev/centos/root 
Size of logical volume centos/root changed from 39.06 GiB (10000 extents) to 69.06 GiB (17680           extents).
Logical volume centos/root successfully resized.
[root@localhost ~]# 
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root 
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=2560000 blks
     =                       sectsz=512   attr=2, projid32bit=1
     =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=10240000, imaxpct=25
     =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=5000, version=2
     =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 10240000 to 18104320

[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 2.0G     0  2.0G   0% /dev
tmpfs                    2.0G     0  2.0G   0% /dev/shm
tmpfs                    2.0G   12M  2.0G   1% /run
tmpfs                    2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/mapper/centos-root   70G  1.5G   68G   3% /
/dev/mapper/centos-data   70G   33M   70G   1% /data
/dev/sda1                497M  143M  354M  29% /boot
tmpfs                    407M     0  407M   0% /run/user/0

//以上可以看出/根分区 及/data分区各增加了30G空间大小

//另：

fdisk /dev/sda 磁盘分区
partprobe 重载分区表

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