HP manual System Response to Power Failures, NonStop NS-Series Cabinets Modular Cabinets

Power Failures: Preparation and Recovery When to Use This Section

When to Use This Section

Use this section for information about how to prepare for power failures and how to recover if a power failure occurs.

System Response to Power Failures

NonStop NS-Series Cabinets (Modular Cabinets)

NonStop NS-series servers are designed to operate in a computer-room environment containing a site UPS. Without a UPS, a system will stop uncontrollably when the power is lost. An optional UPS module can be installed in a modular cabinet to provide power if no site UPS is available.

If AC power to a NonStop NS-series server is lost, the system will shut down after a preset time as long as UPS power is available. If the system shuts down, it will be necessary to restart the system manually when AC power is restored.

If modular cabinets lose power without a UPS, recovery of lost data will be difficult and files might be corrupted.

Regardless of system power-fail scenario, if site air conditioning fails and the computer-room temperature rises, the system might shut itself down uncontrollably as each processor reaches its critical temperature. Refer to the NonStop NS-Series Site Preparation Guide.

NonStop S-Series I/O Enclosures

NonStop S-series I/O enclosures have internal batteries and do not require a UPS. NonStop S-series enclosures must shut down before their battery power is lost. For information about power fail for I/O enclosures, refer to the NonStop NS-Series Planning Guide.

External Devices

External (peripheral), devices, such as tape drives, external disk drives, LAN routers, and SWAN concentrators, are not backed up by internal batteries. External devices behave differently than a system during power failure according to the UPS support provided:

No UPS	Peripheral devices will fail immediately if not supported by a UPS.
With a Site UPS	A site UPS should support external devices until its capacity to supply
	power is exhausted.
With an Internal	An optional internal UPS will not support external devices during
UPS	power failure.

HP Integrity NonStop NS-Series Operations Guide—529869-005

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