Hi clackamas,
Thanks for you reply, that's useful information for me,
Btw please take a look my design, I will reuse FAS2050 (ONTAP 7.3.6) for backup/temporarily store, it does snapmirror (VSM/QSM) to FAS2552 (ONTAP 8.1 7-mode) and then continue to FAS2040 (ONTAP 8.1 7-mode), so is it impossible for this case?
I have also no found ONTAP 8.1.x version for FAS2552 on the support page.
Thanks,