虚拟机有分区的情况下,扩磁盘

--------磁盘有分区的情况下

[root@ywcrmdb ~]# fdisk -l

Disk /dev/sda: 751.6 GB, 751619276800 bytes
255 heads, 63 sectors/track, 91379 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: 0x000923d9

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       65271   523774976   8e  Linux LVM

Disk /dev/mapper/vg_ywcrmdb-lv_root: 473.1 GB, 473117491200 bytes
255 heads, 63 sectors/track, 57519 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_ywcrmdb-lv_root doesn't contain a valid partition table

Disk /dev/mapper/vg_ywcrmdb-lv_swap: 10.6 GB, 10552868864 bytes
255 heads, 63 sectors/track, 1282 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_ywcrmdb-lv_swap doesn't contain a valid partition table

Disk /dev/mapper/vg_ywcrmdb-lv_home: 52.7 GB, 52672069632 bytes
255 heads, 63 sectors/track, 6403 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_ywcrmdb-lv_home doesn't contain a valid partition table

扩展后容量变为751G，需要划分余下未分配的空间
fdisk /dev/sda
Command (m for help): n
Command action
e   extended
p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (65271-91379, default 65271):
Using default value 65271
Last cylinder, +cylinders or +size{K,M,G} (65271-91379, default 91379):
Using default value 91379

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

重启主机后,多出了sda3
[root@ywcrmdb dev]# ls -ltr sd*
brw-rw---- 1 root disk 8, 3  4月 28 11:23 sda3
brw-rw---- 1 root disk 8, 2  4月 28 11:23 sda2
brw-rw---- 1 root disk 8, 1  4月 28 11:23 sda1
brw-rw---- 1 root disk 8, 0  4月 28 11:24 sda

[root@ywcrmdb dev]# pvcreate /dev/sda3
Writing physical volume data to disk "/dev/sda3"
Physical volume "/dev/sda3" successfully created

[root@ywcrmdb dev]# pvdisplay
--- Physical volume ---
PV Name               /dev/sda2
VG Name               vg_ywcrmdb
PV Size               499.51 GiB / not usable 3.00 MiB
Allocatable           yes (but full)
PE Size               4.00 MiB
Total PE              127874
Free PE               0
Allocated PE          127874
PV UUID               qoLfbb-Vsu5-damB-VtNI-Rn3L-PNF5-yvWsEk

"/dev/sda3" is a new physical volume of "200.00 GiB"
--- NEW Physical volume ---
PV Name               /dev/sda3
VG Name
PV Size               200.00 GiB
Allocatable           NO
PE Size               0
Total PE              0
Free PE               0
Allocated PE          0
PV UUID               P2mUfD-BO2J-Oinz-av6G-Oz1H-UYRD-hGciOE

[root@ywcrmdb dev]# vgextend  vg_ywcrmdb /dev/sda3
Volume group "vg_ywcrmdb" successfully extended

[root@ywcrmdb dev]# vgdisplay
--- Volume group ---
VG Name               vg_ywcrmdb
System ID
Format                lvm2
Metadata Areas        2
Metadata Sequence No  5
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                3
Open LV               3
Max PV                0
Cur PV                2
Act PV                2
VG Size               699.50 GiB
PE Size               4.00 MiB
Total PE              179073
Alloc PE / Size       127874 / 499.51 GiB
Free  PE / Size       51199 / 200.00 GiB
VG UUID               5FA4n9-p3o6-TeR4-KbwO-Bg6J-NB8Z-JXo9UX

[root@ywcrmdb dev]# lvextend -L +100G /dev/mapper/vg_ywcrmdb-lv_root
Extending logical volume lv_root to 540.62 GiB
Logical volume lv_root successfully resized