NonStop NS2400 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 NS2400 series 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
Series and NS2400 Series 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 190)
• “NonStop System With a Rack-Mounted UPS” (page 191)
• “SAS Disk Enclosures With a Rack-Mounted UPS” (page 192)
Supported UPS Configurations 189