Mirror LV :

1. df -m  /opt/ibm/db2

2.lslv -l <lv_name>
          ---->  lv_name of the /opt/ibm/db2
3.lspv
          ---->  need to find here what will be the another hdisk belong to same vg

4.mklvcopy <lv_name> 2 hdiskXXX
          ---->  need to use the hdiskXXX name where lv_name doesnot belong too

5.syncvg -p hdiskX1 hdiskx2
          ---->  sycn the vg's hdisks

6.lsvg -l vg_name|grep  lv_name
          ----> need to check lv status shuold be "open/syncd"