Question: what will be used by san to provide connectivity between hosts and storage
[{'answer': 'Appliance based devices', 'provenance': [{'wikipedia_id': '4148872', 'title': 'Storage virtualization', 'start_paragraph_id': 145, 'start_character': 0, 'end_paragraph_id': 145, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Block virtualization.:Implementation approaches.:Network-based.:Appliance-based vs. switch-based.\n'}]}, {'provenance': [{'wikipedia_id': '4148872', 'title': 'Storage virtualization', 'start_paragraph_id': 145, 'start_character': 0, 'end_paragraph_id': 145, 'end_character': 646, 'bleu_score': 0.9817332376369081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2925424504298193478}, 'section': 'Section::::Block virtualization.:Implementation approaches.:Network-based.:Appliance-based vs. switch-based.\n'}]}]