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