NonStop NS14000 Planning Guide (H06.08+)

The optional Model R5500 XR UPS and ERM installed in modular cabinets do not support any
devices that are external to the cabinets. External devices can include Fibre Channel tape drives,
external disk drives, LAN routers, and SWAN concentrators. Any external peripheral devices
that do not have UPS support will fail immediately at the onset of a power failure. Plan for UPS
support of any external peripheral devices that must remain operational as system resources.
This support can come from a site UPS or individual units as necessary.
This information relates to handling power failures:
• For ride-through time, see the SCF Reference Manual for the Kernel Subsystem.
• For the TACL SETTIME command, see the TACL Reference Manual.
• To set system time programmatically, see the Guardian Procedure Calls Reference Manual.
AC Power-Fail States
These states occur when a power failure occurs and an optional HP model R5500 XR UPS is
installed in each cabinet within the system:
NonStop operating system is running normally.NSK_RUNNING
OSM has detect a power failure and begins timing the
outage. AC power returning terminates RIDE_THRU and
puts the operating system back into an NSK_RUNNING
state. At the end of the predetermined RIDE_THRU time,
if AC has not returned, OSM executes a PFAIL_SHOUT
that results in the system going to LOW_POWER.
RIDE_THRU
Normal halt condition. Halted processors do not
participate in power-fail handling. A normal power-on
also puts the processors into the HALTED state.
HALTED
Halted-state services (HSS) informs the NonStop Blade
Element that it is in LOW_POWER state and then waits
until the NonStop Blade Element removes optic power.
LOW_POWER
Loss of optic power from the NonStop Blade Element
occurs, or the UPS batteries suppling the NonStop Blade
Element modules are completely depleted. When power
returns, the system is essentially in a cold-boot condition.
POWER_OFF
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