RHEL7虚拟机中不重启的情况下加新硬盘及扩展根分区容量

在VMware中添加一块新的5G硬盘

显示当前分区

# fdisk -l

通常在你在虚拟机中添加一块新硬盘时，你可能会看到新硬盘没有自动加载。这是因为连接到硬盘的SCSI总线需要重新扫描来使得新硬盘可见。

这里有一个简单的命令来重新扫描SCSI总线和SCSI设备。

确定主机总线号

# ls /sys/class/scsi_host/

host0   host11  host14  host17  host2   host22  host25  host28  host30  host4  host7
host1   host12  host15  host18  host20  host23  host26  host29  host31  host5  host8
host10  host13  host16  host19  host21  host24  host27  host3   host32  host6  host9

重新扫描SCSI总线来添加设备

# for i in $(ls /sys/class/scsi_host/); do echo "- - -" > /sys/class/scsi_host/$i/scan; done

重新显示分区。这时候发现新硬盘已经自动加载了。

# fdisk -l

...
Disk /dev/sdb: 5368 MB, 5368709120 bytes, 10485760 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

显示文件系统，可以看到根分区的VG是rhel，VL是root，分区类型是xfs

# df -hT

Filesystem            Type      Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root xfs       4.0G  1.8G  2.3G  45% /
devtmpfs              devtmpfs  227M     0  227M   0% /dev
tmpfs                 tmpfs     237M     0  237M   0% /dev/shm
tmpfs                 tmpfs     237M  8.5M  229M   4% /run
tmpfs                 tmpfs     237M     0  237M   0% /sys/fs/cgroup
/dev/sda1             xfs       497M  168M  329M  34% /boot
tmpfs                 tmpfs      48M     0   48M   0% /run/user/0

将/dev/sda2建立为pv

# pvcreate /dev/sdb

Physical volume "/dev/sdb" successfully created

由于系统已经有了VG：rhel，这里直接将新建的pv加入到这个VG

# vgextend rhel /dev/sdb

Volume group "rhel" successfully extended

给VL：root增加5G的空间

#  lvextend -L +5G /dev/rhel/root

  Size of logical volume rhel/root changed from 3.97 GiB (1016 extents) to 8.97 GiB (2296 extents).
  Logical volume root successfully resized.

给VL：root增加剩余的空间

# lvextend -l +100%FREE /dev/rhel/root

  Size of logical volume rhel/root changed from 8.97 GiB (2296 extents) to 9.00 GiB (2305 extents).
  Logical volume root successfully resized.

LV扩容之后需要激活修改的配置

# xfs_growfs /dev/rhel/root

meta-data=/dev/mapper/rhel-root  isize=256    agcount=4, agsize=260096 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=1040384, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
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 1040384 to 2360320

重新显示文件系统，可以看到根分区大小从4G增加到了9G

# df -hT

Filesystem            Type      Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root xfs       9.0G  1.8G  7.3G  20% /
devtmpfs              devtmpfs  227M     0  227M   0% /dev
tmpfs                 tmpfs     237M     0  237M   0% /dev/shm
tmpfs                 tmpfs     237M  8.5M  229M   4% /run
tmpfs                 tmpfs     237M     0  237M   0% /sys/fs/cgroup
/dev/sda1             xfs       497M  168M  329M  34% /boot
tmpfs                 tmpfs      48M     0   48M   0% /run/user/0