B 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 NS7 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 NS7 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 NS7 system 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 a Hewlett Packard
Enterprise-supported UPS from the manufacturing default setting to an appropriate value for
your system. During installation of an NS7 or HPE UPS, your service provider can refer to the
"Setting the Ride-Through Time and Configuring for Maximized Runtime" procedure in the
NonStop X System Hardware Installation Manual for these instructions.
Supported UPS Configurations
These are the supported UPS configurations for a NS7 system:
• “NS7 System With a Fault-Tolerant Data Center” (page 82)
• “NS7 System With a Rack-Mounted UPS” (page 83)
• “SAS Disk Enclosures With a Rack-Mounted UPS” (page 84)
Supported UPS Configurations 81
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