Dell EMC VMAX 250F Site Planning Manual

Contents

Dell EMC VMAX 250F Site Planning Manual Manual pdf 74 page image

Best practices: Power configuration guidelinesThe following section provides best practice guidelines for evaluating and connectingpower, as well as for choosing a UPS component.Uptime Institute best practicesFollow these best practice guidelines when connecting AC power to the array:l The EMC customer engineer (CE) should discuss with the customer the need forvalidating AC power redundancy at each bay. If the power redundancyrequirements are not met in each EMC bay, a Data Unavailable (DU) event couldoccur.l The customer should complete power provisioning with the data center prior toconnecting power to the array.l The customer‘s electrician or facilities representative must verify that the ACvoltage is within specification at each of the power drops being fed to each EMCproduct bay.l All of the power drops should be labeled to indicate the source of power (PDU)and the specific circuit breakers utilized within each PDU:n Color code the power cables to help achieve redundancy.n Clearly label the equipment served by each circuit breaker within the customerPDU.l The electrician or facilities representative must verify that there are two powerdrops fed from separate redundant PDUs prior to turning on the array:n If both power drops to a bay are connected to the same PDU incorrectly, a DUevent will result during normal data center maintenance when the PDU isswitched off. The label on the power cables depicts the correct connection.l The electrician should pay particular attention to how each PDU receives powerfrom each UPS within the data center because it is possible to create a scenariowhere turning off a UPS for maintenance could cause both power feeds to a singlebay to be turned off, creating a DU event.l The customer’s electrician should perform an AC verification test by turning offthe individual circuit breakers feeding each power zone within the bay, while theCustomer Engineer monitors the LED on the SPS modules to verify that powerredundancy has been achieved in each bay.One PDU should never supply both power zone feeds to any one rack of equipment.Power extension cords, connectors, and wiringThe following section illustrates a variety of extension cords that offer differentinterface connector options. The selected cords are used to interface between thecustomer’s power source and each PDU connection.The amount of cords needed is determined by the number of bays in the array and thetype of input power source used (single-phase or three-phase).Power cabling, cords and connectors74 Site Planning Guide VMAX 250F, VMAX 450F, VMAX 850F, VMAX 950F with HYPERMAX OS