Hp Insight Management Agents User Manual download pdf (Page 128)

• Page Faults/sec—Overall rate at which the faulted pages are handled by the processor. It is

measured in numbers of pages faulted per second. A page fault occurs when a process

requires code or data that is not in its working set (its space in physical memory). This counter

includes both hard faults (those that require disk access) and soft faults (where the faulted

page is found elsewhere in physical memory). Most processors can handle large numbers of

soft faults without consequence. However, hard faults can cause significant delays. This counter

displays the difference between the values observed in the last two samples, divided by the

duration of the sample interval.

• Cache Bytes—Sum of the System Cache Resident Bytes, System Driver Resident Bytes, System

Code Resident Bytes, and Pool Paged Resident Bytes counters. This counter displays the last

observed value only; it is not an average.

• Cache Faults/sec—Number of faults, that occur when a page sought in the file system cache

is not found and must be retrieved from elsewhere in memory (a soft fault) or from disk (a hard

fault). The file system cache is an area of physical memory that stores recently used pages of

data for applications. Cache activity is a reliable indicator of most application I/O operations.

This counter counts the number of faults, without regard for the number of pages faulted in

each operation.

• Pool Nonpaged Bytes—Number of bytes in the nonpaged pool, an area of system memory

(physical memory used by the operating system) for objects that cannot be written to disk, but

must remain in physical memory as long as they are allocated. Memory: Pool Nonpaged

Bytes is calculated differently than Process: Pool Nonpaged Bytes, so it might not equal Process:

Pool Nonpaged Bytes: _Total. This counter displays the last observed value only; it is not an

average.

• Cache Copy Reads/sec—Frequency of reads from pages of the file system cache that involve

a memory copy of the data from the cache to the application's buffer.

• Cache Copy Read Hits %—Percentage of cache copy read requests that hit the cache, that

is, they did not require a disk read to provide access to the page in the cache. A copy read

is a file read operation that is satisfied by a memory copy from a page in the cache to the

buffer of the application.

Network

TCP

• Active Connections—Number of times TCP connections have made a direct transition to the

SYN-SENT state from the CLOSED state.

• Established Connections—Number of TCP connections for which the current state is either

ESTABLISHED or CLOSE-WAIT.

• Segments/sec—Rate at which TCP segments are sent or received using the TCP protocol.

• Segments Retransmitted/sec—Rate at which segments are retransmitted, that is, segments

transmitted containing one or more previously transmitted bytes.

• Connection Failures—Number of times TCP connections have made a direct transition to the

CLOSED state from the SYN-SENT state or the SYN-RCVD state, and the number of times TCP

connections have made a direct transition to the LISTEN state from the SYN-RCVD state.

Controller

• Total Bytes/sec—Rate at which bytes are sent and received on the interface, including framing

characters.

• Packets/sec—Rate at which packets are sent and received on the network interface.

• Output Queue Length—Length of the output packet queue (in packets). If this length is longer

than 2, delays are being experienced and the bottleneck should be found and eliminated if

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