Some interesting finding to share during the last migration I did. I was performed the cold migration for all the virtual machines on the production. Before we migrated over to the new SAN storage, all the current virtual machines are running with thin provisioning enable from vSphere 4. During the storage migration process, you will need to choose either same as source, thin provision or none thin provision. I had chosen same as source option and perform the storage vmotion. After the storage vmotion done, I realized that the virtual machine had no longer with thin provision enable.

I tried to select thin provision option when I perform the next virtual machine. The thin provision will be maintained as usual after the storage vMotion completed. Well, looks like there are some minor issue on the option to be selected from the migration process on vcenter and vsphere 4. Not a major issue for me, but it may confused others user.