PowerMAN Power Manager Server Glossary

Anonymous Access

The level of access granted to anonymous viewers. This indicates if the PowerMAN report data can be viewed without a logon.

Computer Automatic Site Move

The administrator must allocate each computer to a logical group. This is known as a site. If the administrator changes the site identity associated with a computer the PowerMAN server will normally automatically move the computer to the new group. When the automatic move feature is disabled the computer is 'locked' to the current site.

Cost per KWh

The cost per KWh of the electrical supply. This value is available from your electricity supplier.

Data Retention

The time period that the PowerMAN server retains the computer history information. Normally this is configured to be one year (365 days). This feature prevents the server from running out of storage space.

Estimated KWh / PC - Average Power Consumption

This value, measured in kW, represents the electrical supply requirement of a typical PC. This is usually in the range 0.1-0.3kW (100-300W). PowerMAN uses an initial default value of 150W.

Nominal CO₂ per KWh

The nominal amount of CO₂ released per KWh of electricity generated from fossil fuels. The UK Governement uses a standard figure of 0.43kg/KWh. The exact amount depends upon the source of electricial generation. This value may be less (or even zero) is non-fossil fuels are used to generate the electricity.

Power States

Modern PCs support various power states known as S0-S5 (S6 is also unofficially used by some vendors). Each power state requires decreasing levels of energy to maintain at the expense of increased time to become operational again.

State	Meaning
S0 Operational	The computer is fully operational.
S1 CPU Stopped	The CPU has stopped processing but CPU and RAM remained powered. This is saves the least energy. This state requires the power supply to be maintained.
S2 CPU Off	The CPU is turned off but the RAM remains fully refreshed. This state is often not implemented. This state requires the power supply to be maintained.
S3 CPU off, RAM standby	The CPU is turned off and the RAM contents is maintained. This state will take slightly longer to resume from than S1. Some systems require a BIOS change or jumper setting to support this state. Typical resume takes <5 seconds. This state requires the power supply to be maintained.
S4 Hibernate	RAM contents are saved to disk. CPU and RAM are both off. This state can be maintained indefinitely. Typical resume takes around 20-30 seconds,
S5 Soft-Off	Operating system is shutdown and requires full restart to resume operation.

Site History Toolbar

The site history toolbar is used to control the site history chart. This is the primary reporting tool provided by the PowerMAN server. This chart can reporting on the current site using a variety of reporting metrics:

• The Activity Time report shows the active / inactive time in hours.
• The Activity % report displays the data as a % of the total time.
• The Estimated Cost report shows the data in estimated KWh, financial cost and CO₂ emisions.
• The Computers report displays the number of computers active during the reporting period.
  When weekly reporting is enabled this is the average number of computers each day.

Weekly Option

Most reports are calculated on a daily basis. Sometimes it can be useful to combine days together and report on a weekly basis. This can be useful when evaluating longer term trends or to remove the distortion that can appear in some reports (especially normalised activity time) when there is an unusually small number of computers at the weekend.

Normalise Option

The normalise option divides the reported data by the number of computers. This can be useful to establish an average figure per computer. The normalise option has no effect on report data presented as a percentage.

Show All Option

PowerMAN usually reports on computer inactivity time. The Show All option expands this to include information on computer activity time. This can be useful to build a complete picture of the site activity.

Timezone

PowerMAN allows a timezone, relative to UTC, to be associated with each site. This feature will be used in future releases to provide additional international functions.

Unique Site Identity (GUID)

Each logical group of computers is assigned a unique tracking identity. This GUID may be generated with the makeguid command.

Wake Proxy

The address, if necessary, of the optional PowerMAN Wake-On-LAN gateway proxy. The default proxy is www.yoursite.com/wakeproxy.aspx.