手动给kvm虚机挂载lvm卷

1、查看计算节点上虚机挂载的卷

[root@xgto01n010243186070 ~]# virsh domblklist instance-00000349
Target     Source
------------------------------------------------
vda        /os_instance/026deca9-64a9-4cb4-830d-6806356be1bb/disk

2、查看计算节点上的vg

[root@xgto01n010243186070 ~]# vgdisplay
  --- Volume group ---
  VG Name               vg_os
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               4.04 TiB
  PE Size               4.00 MiB
  Total PE              1058079
  Alloc PE / Size       849920 / 3.24 TiB
  Free  PE / Size       208159 / 813.12 GiB
  VG UUID               Dgvra8-axy2-H6iR-KQKN-t1hL-L89y-6ONv6l 

3、创建lvm卷

[root@xgto01n010243186070 ~]# lvcreate -n test36 -L 1.5 vg_os
  Rounding up size to full physical extent 4.00 MiB
  Logical volume "test36" created.

4、查看创建的lvm卷

[root@xgto01n010243186070 ~]# lvdisplay |grep test36
  LV Path                /dev/vg_os/test36
  LV Name                test36

5、virsh  attach-disk挂载卷

virsh attach-disk instance-00000349 /dev/vg_os/test36 vdb --driver qemu --mode shareable

6、查看虚机挂载的lvm卷

[root@xgto01n010243186070 ~]# virsh domblklist instance-00000349
Target     Source
------------------------------------------------
vda        /os_instance/026deca9-64a9-4cb4-830d-6806356be1bb/disk
vdb        /dev/vg_os/test36

7、卸载虚机额外挂载的lvm卷

virsh detach-disk <domain> <target> [--persistent] [--config] [--live] [--current]
virsh detach-disk  instance-00000349  vdb
[root@xgto01n010243186070 ~]# virsh detach-disk  instance-00000349  vdb
Disk detached successfully

8、检查lvm卷是否卸载成功

[root@xgto01n010243186070 ~]# virsh domblklist instance-00000349
Target     Source
------------------------------------------------
vda        /os_instance/026deca9-64a9-4cb4-830d-6806356be1bb/disk

9、移除创建的lvm卷

[root@xgto01n010243186070 ~]# lvremove /dev/vg_os/test36
Do you really want to remove active logical volume vg_os/test36? [y/n]: y
  Logical volume "test36" successfully removed
[root@xgto01n010243186070 ~]# lvdisplay |grep test36