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50 HP StorageWorks Disk Array XP128: Site Preparation Guide
Uninterruptible Power Supply (UPS)
Caution This uninterruptible power supply (UPS) reference is for a product UPS
implementation. If you are planning or already have a sitewide UPS,
Hewlett-Packard recommends against a product UPS powered by a
sitewide UPS for the XP128.
Most HP Disk Array XP128 units are installed in data centers where an
uninterruptible power supply (UPS) strategy is already in place. However,
if you are making your first large disk array purchase, you may have a need
for a separate UPS solution. HP references the Silcon DP300 series UPS
solution. The Silcon DP300 is a product from American Power Conversion
Corp (APC), manufacturers of uninterruptible power systems.
UPS features
The APC UPS, Silcon DP300 series, provides the following feature set:
• Protection against short line transients
• Continued availability during short duration power failures (a
minimum of 30 minutes for a fully-configured system)
• Stable AC output voltage
• LCD display unit with ability to display key AC input/output
parameters, alarm log, events log and programming functions
• Communications interface option for communicating a remote UPS
shutdown through the serial port connection.
UPS limitations
While the UPS will provide uninterrupted power to the XP array in the
event of a power failure, once the battery runtime is exceeded, it will shut
down, resulting in a loss of AC power to the array. The UPS does have the
ability to communicate an oncoming shutdown to the host via the Silcon