NonStop NS2200 Series Planning Guide

G UPS and Data Center Power Configurations
This appendix provides examples of UPS and data center power configurations, and:
• Specifies the UPS configurations supported on the NonStop system including the recommended
UPS configuration for when the disk drive write cache is enabled.
• Identifies the non-supported UPS configurations that should not be used with the NonStop
system when the disk drive write cache is enabled.
• Explains why some configurations are not supported.
• Informs you of what you must do to prevent data loss.
NOTE: All example UPS configuration illustrations in this appendix show NonStop BladeSystem
hardware, but these configurations are supported on all NonStop platforms and can be used with
single-phase and three-phase UPS.
IMPORTANT: You must change the ride-through time for an HP-supported UPS from the
manufacturing default setting to an appropriate value for your system. During installation of a
NonStop NS2200 system or HP UPS, your service provider can refer to the "Setting the Ride-Through
Time and Configuring for Maximized Runtime" procedure in the NonStop NS2200 Hardware
Installation Manual for these instructions.
Supported UPS Configurations
These are the supported UPS configurations for a NonStop system:
• “NonStop System With a Fault-Tolerant Data Center” (page 199)
• “NonStop System With a Rack-Mounted UPS” (page 200)
• “SAS Disk Enclosures With a Rack-Mounted UPS” (page 201)
198 UPS and Data Center Power Configurations