NonStop NS1000 Planning Guide (H06.08+)

For each VIO enclosure to operate, at least one power supply in each VIO enclosure must be
operational. For fault tolerance, you must connect the power supplies in each VIO enclosure to
separate power distribution units (PDUs). For example, the power supplies located in slot 15
and slot 18 of each VIO enclosure cannot both be plugged into the left PDU.
The two VIO enclosures promote fault-tolerant configuration and servicing:
• Redundant hardware provides fault tolerance if it is divided between the two VIO enclosures.
• Fault-tolerant paths must be configured through the two VIO enclosures.
This illustration shows the slot locations and component details for a single VIO enclosure:
Because each VIO enclosure is a single module, two VIO enclosures are required to provide
fault-tolerant paths. The paths must be configured through both VIO enclosures. For example,
Versatile I/O (VIO) Enclosure 61