I can confirm the san volume needs to put online by hand, and write access needs to be setup on san side. Also for direct SAN Backups disks need to be put online by hand (but not writable of course)
However we also cannot find a Reason for slow restore speeds. SAN is able to do 2GB/s+ and Backup repository is also able to at least read at a few hundred mb/s (72 7K4 SATA Disks in multiple Raid 5s striped in Windows). However we never get over 22MB/s, NDB restores are about the same. We could never find a reason
Network is 10Gbit, SAN is FC connected.