linux增加新的磁盘空间 采用lvm方式

本人用虚拟机搭建 大数据开发环境，后来数据量上去了 发现磁盘不够用，折腾了一下新增磁盘的方法，一开始总是不对，后来知道了一个lvm的方法，很方便好用。特此记录下来

1查看目前磁盘分区情况，系统是安装在一块45G的虚拟磁盘上。安装系统时采用了LVM分区方式。其中/soft空间大小为11G

 

2 查看目前虚拟机的磁盘情况，目前虚拟机中有两块硬盘，/dev/sda
45G，/dev/sdb 55G

3 创建pv
,通过pvcreate命令将磁盘/dev/sdb创建为一个系统PV

# pvcreate /dev/sdb

4、将 PV /dev/sdb添加到卷组vg_openstack中。参考下图中标记的数据可知，磁盘已经添加到vg_openstack，而且卷组的空间增加了50G

# vgextend  vg_openstack  /dev/sdb

5、为/soft 添加30G的空间。图中标记的位置给出了/soft的大小，以及/soft的lv名称为 /dev/vg_openstack/LogVol04

# lvextend -L +30G -n /dev/vg_openstack/LogVol04

# lvextend -l +100%FREE /dev/VolGroup/lv_root      #  扩展整块硬盘空间     

6、逻辑卷扩展后并不会马上生效，需要使用“resize2fs”命令重新加载逻辑卷的大小,图中可知，/soft已经添加30G空间

# resize2fs  /dev/vg_openstack/LogVol04

参考操作  红色部分是重要步骤。可能需要根据环境变动

[root@master ~]# fdisk -l

Disk /dev/sda: 107.4 GB, 107374182400 bytes

255 heads, 63 sectors/track, 13054 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0002a3e3

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          64      512000   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2              64       13055   104344576   8e  Linux LVM

Disk /dev/sdb: 161.1 GB, 161061273600 bytes

255 heads, 63 sectors/track, 19581 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

Disk /dev/mapper/vg_master-lv_root: 53.7 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

Disk /dev/mapper/vg_master-lv_swap: 5200 MB, 5200936960 bytes

255 heads, 63 sectors/track, 632 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

Disk /dev/mapper/vg_master-lv_home: 48.0 GB, 47957671936 bytes

255 heads, 63 sectors/track, 5830 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

[root@master ~]# pvcreate /dev/sdb

  Physical volume "/dev/sdb" successfully created

[root@master ~]# vgex

vgexport  vgextend  

[root@master ~]# pvs

  PV         VG        Fmt  Attr PSize   PFree  

  /dev/sda2  vg_master lvm2 a--   99.51g      0

  /dev/sdb             lvm2 a--  150.00g 150.00g

[root@master ~]# vgs

  VG        #PV #LV #SN Attr   VSize  VFree

  vg_master   1   3   0 wz--n- 99.51g    0

[root@master ~]# vgextend  vg_master /dev/sdb

  Volume group "vg_master" successfully extended

[root@master ~]# vgs

  VG        #PV #LV #SN Attr   VSize   VFree  

  vg_master   2   3   0 wz--n- 249.50g 150.00g

[root@master ~]# df -h

Filesystem                     Size  Used Avail Use% Mounted on
/dev/mapper/vg_master-lv_root   50G   33G   14G  71% /

tmpfs                          5.9G  8.0K  5.9G   1% /dev/shm

/dev/sda1                      485M   39M  421M   9% /boot

/dev/mapper/vg_master-lv_home   44G  561M   42G   2% /home

cm_processes                   5.9G  1.9M  5.9G   1% /var/run/cloudera-scm-agent/process

[root@master ~]# lvextend -l +100%FREE /dev/mapper/vg_master-lv_root

  Extending logical volume lv_root to 200.00 GiB

  Logical volume lv_root successfully resized

[root@master ~]# resize2fs   /dev/mapper/vg_master-lv_root          

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/mapper/vg_master-lv_root is mounted on /; on-line resizing required

old desc_blocks = 4, new_desc_blocks = 13

Performing an on-line resize of /dev/mapper/vg_master-lv_root to 52427776 (4k) blocks.

The filesystem on /dev/mapper/vg_master-lv_root is now 52427776 blocks long.

[root@master ~]# df -h

Filesystem                     Size  Used Avail Use% Mounted on

/dev/mapper/vg_master-lv_root  197G   34G  154G  18% /

tmpfs                          5.9G  8.0K  5.9G   1% /dev/shm

/dev/sda1                      485M   39M  421M   9% /boot

/dev/mapper/vg_master-lv_home   44G  561M   42G   2% /home

cm_processes                   5.9G  1.9M  5.9G   1% /var/run/cloudera-scm-agent/process

[root@master ~]#