Filter
Top Products
Power Failures: Preparation and Recovery
HP Integrity NonStop NS-Series Operations Guide—529869-005
14-2
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
UPS
An optional internal UPS will not support external devices during
power failure.