HP ProLiant DL380 G5 Server - Manual (Page 33)

interrupts and DPCs. A high rate of privileged time might be attributable to many interrupts generated by a
failing device. This counter displays the average busy time as a percentage of the sample time.
• % DPC Time—Percentage of time that the processor spent receiving and servicing deferred procedure calls
(DPCs) during the sample interval. DPCs are interrupts that run at a lower priority than standard interrupts. %
DPC Time is a component of % Privileged Time because DPCs are executed in privileged mode. They are
counted separately and are not a component of the interrupt counters. This counter displays the average busy
time as a percentage of the sample time.
• % Interrupt Time—Percentage of time the processor spent receiving and servicing hardware interrupts during the
sample interval. This value is an indirect indicator of the activity of devices that generate interrupts, such as the
system clock, the mouse, disk drivers, data communication lines, network interface cards and other peripheral
devices. These devices normally interrupt the processor when they have completed a task or require
attention. Normal thread execution is suspended during interrupts. Most system clocks interrupt the processor
every 10 milliseconds, creating a background of interrupt activity. This counter displays the average busy time
as a percentage of the sample time.
• % CPU Time (Thresholds Supported)—Percentage of time that the processor is executing a non-idle thread.
Designed as a primary indicator of processor activity, this counter is calculated by measuring the time that the
processor spends executing the thread of the idle process in each sample interval, and subtracting that value
from 100%. Each processor has an idle thread, that consumes cycles when no other threads are ready to run. It
can be viewed as the percentage of the sample interval spent doing useful work. This counter displays the
average percentage of busy time observed during the sample interval. It is calculated by monitoring the time,
the service was inactive, and then subtracting that value from 100%.
Server
System Health
• System Up Time—Elapsed time (in seconds) that the computer has been running since it was last started. This
counter displays the difference between the start time and the current time.
• Total Threads—Number of threads in the computer at the time of data collection. This count is an instantaneous
count, not an average over the time interval. A thread is the basic executable entity that can execute instructions
in a processor.
• Context Switches/sec—Combined rate at which all processors on the computer are switched from one thread to
another. Context switches occur when a running thread voluntarily relinquishes the processor, is pre-empted by
a higher priority ready thread, or switches between user mode and privileged (kernel) mode to use an executive
or subsystem service. The context switches/sec rate for all threads running on all processors in the computer is
measured in numbers of switches. Context switch counters on the system and thread objects display the
difference between the values observed in the last two samples, divided by the duration of the sample interval.
• Processor Queue Length—Number of threads in the processor queue. There is a single queue for processor time
even on computers with multiple processors. Unlike the disk counters, this counter counts ready threads only, not
threads that are running. A sustained processor queue of greater than two threads generally indicates processor
congestion. This counter displays the last observed value only; it is not an average.
• Total Processes—Number of processes in the computer at the time of data collection. This count is an
instantaneous count, not an average over the time interval. Each process represents the running of a program.
• % Registry Usage —Percentage of the Total Registry Quota Allowed that is currently being used by the system.
This counter displays the current percentage value only; it is not an average.
Security
• Access Permission Errors—Number of times opens on behalf of clients has failed with
STATUS_ACCESS_DENIED. This object can indicate random attempts to access files that are not properly
protected.
• Access Granted Errors—Number of times access to files opened successfully were denied. This object can
indicate attempts to access files without proper access authorization.
• Server Logon Errors—Number of failed logon attempts to the server. This object can indicate whether the
password guessing programs are being used to violate the security on the server.
• Server Sessions Errored-Out—Number of sessions that have been closed because of unexpected error
conditions or sessions that have reached the auto-disconnect timeout and have been disconnected normally.
Server Utilization
• (Network Utilization) Total Bytes/sec—Total bytes per second that aserver has sent to and received from the
network. This value provides an overall indication of how busy the server is.
• Server Sessions—Number of sessions currently active in the server. This object indicates current server activity.
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