To unmount the hard disk from old Analytics version
Login to the Analytics UI using the IPV4 address, username and password.
Navigate to System > Shutdown. Click Shutdown. On prompting for confirmation, click OK.
Once it is successfully powered off, select the Analytics instance, right-click and click Settings.
Unmount the Hard disk 2 by clicking X button on right corner of Hard disk 2 in ESXi interface.
Do not select the Delete files from datastore option as it will delete all the data on the disk.
Click OK to complete the unmounting procedure.