LVM的用法

LVM的用法-LVM的移动

用Fdisk分区：

Disk /dev/sdb: 17.2 GB, 17179869184 bytes, 33554432 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
Disk label type: dos
Disk identifier: 0x15f5c5f3


   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048    31459327    15728640    5  Extended
/dev/sdb5            4096     2101247     1048576   8e  Linux LVM
/dev/sdb6         2103296     4200447     1048576   8e  Linux LVM
/dev/sdb7         4202496     6299647     1048576   8e  Linux LVM


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


Calling ioctl() to re-read partition table.
Syncing disks.

[root@localhost ream]# 

用 ls查看：

[root@localhost ream]# ll /dev/sdb*
brw-rw----. 1 root disk 8, 16 Jul 27 21:53 /dev/sdb
brw-rw----. 1 root disk 8, 17 Jul 27 21:53 /dev/sdb1
brw-rw----. 1 root disk 8, 21 Jul 27 21:53 /dev/sdb5
brw-rw----. 1 root disk 8, 22 Jul 27 21:53 /dev/sdb6
brw-rw----. 1 root disk 8, 23 Jul 27 21:53 /dev/sdb7
[root@localhost ream]# 

新建物理卷，卷组，逻辑卷：

[root@localhost ream]# pvcreate /dev/sdb{5,6}
  Physical volume "/dev/sdb5" successfully created
  Physical volume "/dev/sdb6" successfully created
[root@localhost ream]# vgcreate vg1 /dev/sdb{5,6}
  Volume group "vg1" successfully created

[root@localhost ream]# lvcreate -L 1G -n lv1 vg1
  Logical volume "lv1" created
[root@localhost ream]# lvs
  LV   VG   Attr       LSize  Pool Origin Data%  Move Log Cpy%Sync Convert
  root rhel -wi-ao---- 17.51g                                             
  swap rhel -wi-ao----  2.00g                                             
  lv1  vg1  -wi-a-----  1.00g                                             
[root@localhost ream]#

查看物理卷使用情况：

[root@localhost ream]# pvs
  PV         VG   Fmt  Attr PSize    PFree   
  /dev/sda2  rhel lvm2 a--    19.51g       0 
  /dev/sdb5  vg1  lvm2 a--  1020.00m       0 
  /dev/sdb6  vg1  lvm2 a--  1020.00m 1016.00m
[root@localhost ream]# 

现在要把sdb5移出来：

[root@localhost ream]# pvcreate /dev/sdb7
  Physical volume "/dev/sdb7" successfully created
[root@localhost ream]# 

[root@localhost ream]# vgextend vg1 /dev/sdb7
  Volume group "vg1" successfully extended
[root@localhost ream]# pvmove /dev/sdb5 /dev/sdb7
  /dev/sdb5: Moved: 0.0%
  /dev/sdb5: Moved: 32.9%
  /dev/sdb5: Moved: 65.1%
  /dev/sdb5: Moved: 98.0%
  /dev/sdb5: Moved: 100.0%
[root@localhost ream]# vgreduce vg1 /dev/sdb5

[root@localhost ream]# pvremove /dev/sdb5