As I had written. VirtualBox is very good tool for virtualization. Today I wanted to install new ZFS zone into my Solaris but I had not space for it.
I found out very easy way how to connect new disk into existing one covered by operating system.
In VirtualBox I created new virtual disk in VirtualDiskManager. Then I connected it as primary slave hard disk.
When I started up my solaris a did ZFS partion on this new disk.
Really great 
