centos7调整磁盘大小

1、建立并查看物理磁盘

#fdisk -l /dev/sdb

Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 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

2、建立物理卷

#pvcreate /dev/sdb

Physical volume "/dev/sdb" successfully created

3、建立卷组

#vgcreate vgdisk /dev/sdb

Volume group "vgdisk" successfully created

4、建立逻辑卷 (-L 150M逻辑卷大小为150M)

#lvcreate -L 150M -n lvdisk vgdisk

Rounding up size to full physical extent 152.00 MiB
  Logical volume "lvdisk" created.

5、查看逻辑卷信息

#lvs

lvdisk vgdisk -wi-a----- 152.00m

6、格式化逻辑卷

#mkfs.xfs /dev/vgdisk/lvdisk

meta-data=/dev/vgdisk/lvdisk     isize=256    agcount=4, agsize=9728 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=38912, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal log           bsize=4096   blocks=853, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, 

7、扩展逻辑卷大小 (原大小上增加500m)

#lvextend -L +500M /dev/vgdisk/lvdisk

 Size of logical volume vgdisk/lvdisk changed from 152.00 MiB (38 extents) to 652.00 MiB (163 extents).
  Logical volume lvdisk successfully resized

8、查看/dev/sdb的UUID,挂载逻辑卷并同步系统空间大小

#blikd

/dev/sdb: UUID="jTbW6E-X2sr-dGfb-1iDs-aUbI-rmNW-Udcv5w" TYPE="LVM2_member" 
/dev/mapper/vgdisk-lvdisk: UUID="794ca76a-8bc5-4f3b-934b-916a9e621a1d" TYPE="xfs"

#vim /etc/fstab

UUID=794ca76a-8bc5-4f3b-934b-916a9e621a1d /lv-disk xfs defaults 0 0

#mount -a挂载生效

[# lvdisplay /dev/vgdisk/lvdisk  查看逻辑卷详细信息
  --- Logical volume ---
  LV Path                /dev/vgdisk/lvdisk
  LV Name                lvdisk
  VG Name                vgdisk
  LV UUID                6l1XUv-3NEH-QxOx-vw6t-KXDc-9C2q-yBG37I
  LV Write Access        read/write
  LV Creation host, time boaili, 2017-02-26 20:52:32 +0800
  LV Status              available
  # open                 1
  LV Size                652.00 MiB
  Current LE             163
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2

#xfs_growfs /dev/vgdisk/lvdisk

meta-data=/dev/mapper/vgdisk-lvdisk isize=256    agcount=4, agsize=9728 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=38912, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=853, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 38912 to 166912

9、缩小逻辑卷空间大小到200M

#umount /lv-disk

#e2fsck -f /dev/vgdisk/lvdisk  扫描逻辑卷

#resize2fs /dev/vgdisk/lvdisk 200M 缩小文件系统大小

#lvreduce -L 200M /dev/vgdisk/lvdisk  缩小逻辑卷大小
  WARNING: Reducing active logical volume to 200.00 MiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lvdisk? [y/n]: 

Size of logical volume vgdisk/lvdisk changed from 652.00 MiB (163 extents) to 200.00 MiB (50 extents).
  Logical volume lvdisk successfully resized

# lvdisplay /dev/vgdisk/lvdisk
  --- Logical volume ---
  LV Path                /dev/vgdisk/lvdisk
  LV Name                lvdisk
  VG Name                vgdisk
  LV UUID                6l1XUv-3NEH-QxOx-vw6t-KXDc-9C2q-yBG37I
  LV Write Access        read/write
  LV Creation host, time boaili, 2017-02-26 20:52:32 +0800
  LV Status              available
  # open                 0
  LV Size                200.00 MiB
  Current LE             50
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2

10、挂载swap

#fdisk /dev/sdb

#mkswap /dev/sdb

#swapon /dev/sdb