HP Insight Management Agents - Manual (Page 119)

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Pages Input/sec—Number of pages read from disk to resolve hard page faults. Hard page
faults occur when a process requires code or data that is not in its working set or elsewhere
in physical memory, and must be retrieved from disk. This counter was designed as a primary
indicator of the faults that cause system-wide delays. It includes pages retrieved to satisfy faults
in the file system cache (usually requested by applications) and in non-cached mapped memory
files. This counter counts numbers of pages, and can be compared to other counts of pages,
such as Memory: Page Faults/sec, without conversion. This counter displays the difference
between the values observed in the last two samples, divided by the duration of the sample
interval.
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Pages Output/sec—Number of pages written to disk to free up space in physical memory.
Pages are written back to disk only if they are changed in physical memory, so they are likely
to hold data, not code. A high rate of pages output might indicate a memory shortage.
Windows NT writes more pages back to disk to free up space when physical memory is in
short supply. This counter counts numbers of pages, and can be compared to other counts of
pages, without conversion. This counter displays the difference between the values observed
in the last two samples, divided by the duration of the sample interval.
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Page Reads/sec—Number of times the disk was read to resolve hard page faults. Hard page
faults occur when a process requires code or data that is not in its working set or elsewhere
in physical memory, and must be retrieved from disk. This counter was designed as a primary
indicator of the kinds of faults that cause system-wide delays. It includes reads to satisfy faults
in the file system cache (usually requested by applications) and in non-cached mapped memory
files. This counter counts numbers of read operations, without regard to the numbers of pages
retrieved by each operation. This counter displays the difference between the values observed
in the last two samples, divided by the duration of the sample interval.
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Page Writes/sec—Number of times pages were written to disk to free up space in physical
memory. Pages are written to disk only if they are changed while in physical memory, so
they are likely to hold data, not code. This counter counts write operations, without regard
to the number of pages written in each operation. This counter displays the difference between
the values observed in the last two samples, divided by the duration of the sample interval.
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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.
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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.
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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.
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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.
Sub-system Classification 119