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-
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
  Metadata Sequence No
  VG Access             read/write
  VG Status             resizable
  MAX LV
  Cur LV
  Open LV
  Max PV
  Cur PV
  Act PV
  VG Size               4.04 TiB
  PE Size               4.00 MiB
  Total PE
  Alloc PE / Size        / 3.24 TiB
  Free  PE / Size        / 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- /dev/vg_os/test36 vdb --driver qemu --mode shareable

6、查看虚机挂载的lvm卷

[root@xgto01n010243186070 ~]# virsh domblklist instance-
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-  vdb
[root@xgto01n010243186070 ~]# virsh detach-disk  instance-  vdb
Disk detached successfully

8、检查lvm卷是否卸载成功

[root@xgto01n010243186070 ~]# virsh domblklist instance-
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