Owner's Manual

98 Monitoring and Alerting
Available Memory The amount of physical memory available to
processes running on the system, in Megabytes,
rather than bytes as reported in Memory\\Available
Bytes. It is calculated by adding the amount of space
on the Zeroed, Free, and Standby memory lists.
Free memory is ready for use; Zeroed memory are
pages of memory filled with zeros to prevent later
processes from seeing data used by a previous process;
Standby memory is memory removed from a process'
working set (its physical memory) on route to disk,
but is still available to be recalled. This counter
displays the last observed value only; it is not an
average.
Pages IO/Sec The rate at which pages are read from or written to
the disk to resolve hard page faults. This counter is
a primary indicator of the kinds of faults that cause
system-wide delays. It is the sum of Memory\\Pages
Input/sec and Memory\\Pages Output/sec. It is
counted in numbers of pages, so it can be compared
to other counts of pages, such as Memory\\Page
Faults/sec, without conversion. It includes pages
retrieved to satisfy faults in the file system cache
(usually requested by applications) non-cached
mapped memory files.
Network
Incoming Bytes/Sec The rate at which bytes are received over each
network adapter, including framing characters.
Network Interface\\Bytes Received/sec is a subset of
Network Interface\\Bytes Total/sec.
Incoming Packets/Sec The rate at which packets are received on the
network interface.
Outgoing Bytes/Sec The rate at which bytes are sent over each network
adapter, including framing characters. Network
Interface\\Bytes Sent/sec is a subset of Network
Interface\\Bytes Total/sec.
Table 9-4. Metrics for Performance
(continued)
Metric
(Total Count=simple+compound)
Description
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