HP RP36000/3 ISS Technology Update, Volume 9, Number 4
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- HP RP36000/3 | ISS Technology Update, Volume 9, Number 4 - Page 1
2 HP ISS Technology Update Volume 9, Number 4 Keeping you informed of the latest ISS technology Best practices for selecting a UPS ...1 HP ProLiant servers offer protection against stealthy, malicious code 4 Setting HP Smart Array controller cache ratio 5 Meet the Expert-Reza Bacchus ...6 Recently - HP RP36000/3 | ISS Technology Update, Volume 9, Number 4 - Page 2
Line-interactive A line-interactive UPS is similar to the standby UPS, except that it includes a multi-tap, variable-voltage transformer in the line circuitry. The UPS can change the tap on the transformer to decrease or increase the line voltage supplied to the load if the utility voltage is too - HP RP36000/3 | ISS Technology Update, Volume 9, Number 4 - Page 3
HP power and cooling technologies for the data center URL http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01234421/ c01234421.pdf http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02018535/ c02018535.pdf 80 PLUS HP Power Protection and Distribution http://www.80plus.org/ http - HP RP36000/3 | ISS Technology Update, Volume 9, Number 4 - Page 4
environment Trusted Platform Module (TPM) v1.2 HP offers the TPM microcontroller as an option kit for select ProLiant G6 and G7 servers which support Intel TXT. The TPM securely stores encryption keys, passwords, and digital certificates which can be used to authenticate the platform. It can also - HP RP36000/3 | ISS Technology Update, Volume 9, Number 4 - Page 5
the topics discussed in this article, visit: Resource HP Smart Array controllers and basic RAID performance factors URL http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02249094 /c02249094.pdf How many bytes are in a GB? http://h20000.www2.hp.com/bc/docs - HP RP36000/3 | ISS Technology Update, Volume 9, Number 4 - Page 6
features into industry-standard specifications and then into production. He also works with HP server platform architects and designers to help guide their designs for implementation of new memory technologies-the most recent examples being low-voltage DIMMs and load-reduced DIMMs (LR-DIMMs - HP RP36000/3 | ISS Technology Update, Volume 9, Number 4 - Page 7
Delivery Repository with http://h20000.www2.hp.com/bc/docs/support/SupportManual Red Hat Network Satellite™ /c02231465/c02231465.pdf HP warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be
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HP ISS Technology Update
Volume 9, Number 4
Keeping you informed of the latest ISS technology
Best practices for selecting a UPS
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1
HP ProLiant servers offer protection against stealthy, malicious code
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4
Setting HP Smart Array controller cache ratio
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5
Meet the Expert
—
Reza Bacchus
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6
Recently published Industry-Standard Server technology papers
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Contact us
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Best practices for selecting a UPS
The primary function of an uninterruptible power supply (UPS) is to supply power to connected loads,
such as computers, when the utility power fails or has poor quality. In either instance, the quality of
UPS
output waveform must be suitable for your computer‘s power supply. Most server
power supplies
contain input fault detection circuitry that verifies the quality of the UPS output waveform. Server
power supplies also use ―active‖ power factor correction (PF
C) to improve their operation. An active
PFC power supply is especially affected by the quality of a UPS output waveform. This article
describes the characteristics of UPS output waveforms and recommends best practices when selecting
a UPS.
UPS types
There are three basic UPS topologies
—
standby, line-interactive, and double conversion --- but they
all have a few things in common. Each consists of input circuitry, a battery bank and charger, as well
as a DC/AC inverter. The input circuitry filters the source current and protects against power surges.
The battery bank supplies power if utility power fails. And the DC/AC inverter circuit converts the DC
power from the battery bank to AC power for the connected devices. Line interactive and double
conversion UPSs include additional circuitry as described below.
Standby (Offline)
A standby UPS passes incoming utility power directly to the load through internal surge protection
circuitry and a transfer switch. The battery remains charged and the DC/AC inverter is normally
powered off. When the incoming utility voltage fails or falls below a predetermined level, the inverter
turns on and the transfer switch shifts the load to the inverter. The transfer time can be as long as
10 milliseconds (ms) depending on how long it takes the standby UPS to detect the lost utility voltage.
Since a standby UPS does not isolate the load from utility power during normal operation, it is not
recommended for critical loads.