I have VM running but I dont have access to the vSphere... so is there a way to add virtual disks using command lines throught the RedHat installed (SSH) instead of vSphere?
This is how I would do using vSphere:
Select > > > VM Edit settings Add Harddisk
Create new virtual disk
Select the appropriate Capacity Disk.
Disk Provisioning should be "Thick Provision Lazy Zeroed" unless fault tolerance is enabled.
Select "Specify a datastore or datastore cluster:" and browse for the appropriate datastore
For Mode select Independant - Persistent
Verify that the setup is correct and click Finish