Powerstore pre-troubleshooting info

Helllo Cine,
I have a questions on powersore that should help me decide whether use it or not in the near future.

Let's just say I will use a local mountpoint for /opt and zimbra while using a remote (iSCSI/NFS) mount point for the secondary storage location.
What happens if there is a network outage and the remote volume becomes unavailable?

Another small question: if I change the HSM policy to bring back on primary what was previously moved to secondary, does that happens automagically os shall I move Blob objects by CLI ?

Thank you
Bittone