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Filter Examples: |
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C:\Program Files\*
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C:\Program
Files\myProgram.exe |
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C:\junk.* |
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D:\*
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Using the WMIsampleFilters Filter Selection
The "WMIsampleFilters" Filter Selection is provided as part of
the installation of the hIOmon
software. Use the hIOmon
WMI Browser "View
- Filter Selection" menu option to display a list of Filter Selections currently defined; click on the
"Get FS
Name List"
button to retrieve the names of the Filter Selections. The "WMIsampleFilters"
Filter Selection should be included within the drop-down box. Select "WMIsampleFilters"
from the drop-down box to view the contents of this Filter Selection.
The "WMIsampleFilters" Filter Selection includes eight (8) Filters; seven for
device "C" and one for device "D". Except for the Filter that specifies
the "pagefile.sys" file, the Filters for device C represent (popular)
directories. Wildcards are used so that all files/directories within the
sub-folders will also be monitored by the hIOmon
I/O Monitor.
The following instructions show
how the Filters defined within the "WMIsampleFilters" Filter Selection can be
modified.
NOTE:
Please be sure to remove any Filters that represent floppy, CD, or DVD lettered
drive paths (otherwise you will encounter an error message when the hIOmon
I/O Monitor tries to "Load" the Filter Selection; "Loading a Filter Selection"
is further described below).
Filter Options
To take a closer look at the specific type of information that the hIOmon
I/O
Monitor is to collect for each Filter, use the "Display Filter Selection -
Filters" section of the hIOmon WMI Browser "View - Filter Selections" display. Enter
"WMIsampleFilters" within the
box below
the "Get Filters" button, then click on the "Get Filters" button. The
underlying display table will then show entries for each of the eight
Filters defined within the "WMIsampleFilters" Filter Selection. You will
notice that one of the Filters is highlighted in bold; this indicates
that the Filter represents an "exclusion" (i.e., that the respective files are
explicitly excluded from being monitored by the hIOmon
I/O Monitor).
You will also notice that one of the Filters has the
"FileSummaryPeriodTime"
Filter option set for 15 seconds (i.e., that the summarized file I/O operation
performance information collected by the hIOmon
I/O Monitor is to be prepared
for offload to the hIOmon
Manager on a periodic 15-second basis). The remaining Filters show that the
"FileSummaryOnFileAlert"
Filter option has been set; this indicates that the summarized file I/O
operation performance information collected by the hIOmon
I/O Monitor is to be
prepared for offload to the hIOmon Manager when an alert threshold has been
reached/detected by the hIOmon
I/O Monitor.
Which particular Alerts have
been set? A quick way to find out is to add the "Alerts active list" entry
to the display table (by selecting "Alerts active list" from the drop-down box
and then clicking on the "Add Filter Option to Table" button located to the left
of the drop-down box), and then click on the "Get Filters" button again.
The "Alerts active list" column of the display table should now show, for each
filter, a list representing the names of those Alert Filter options that have
been activated (i.e., set to true). You will notice that four Alerts have
been set (i.e., alerts for average response time and maximum response time
separately for
read and for write I/O operations). To see the actual alert threshold values
for each of these alerts, add the "Alert_Value..." option for the respective Filter
option (e.g., "Alert_Value_ResponseTimeAvg_Read" for the "Alert_ResponseTimeAvg_Read"
Filter option) to the display table and then click on the "Get Filters" button
again.
Please note that the Filters within the WMIsampleFilters Filter Selection
have been set so that only read and write (but not control) I/O
operations are to be monitored by the hIOmon
I/O Monitor. I/O operations
such as open, close, and create are considered to be "control" type I/O
operations.
Optional Device Summaries
Lastly, please note that "Device
Summaries" have
also been defined within the
WMIsampleFilters Filter Selection. A "Device Summary" pertains to all
Filters (within a Filter Selection) that are associated with the same
device and for which an aggregate, collective sum of summarized file I/O
operation performance metrics for all of these files is to be offloaded
on a periodic basis (or when a "File-Close" or "File-Alert" occurs) for any
of the files. The WMIsampleFilters Filter Selection specifies a Device
Summary for two devices (C and D), each on a one-minute periodic basis. To
view the particular filter option settings associated with these respective
Device Summaries, enter "WMIsampleFilters" within the box below the "Get Device
Summaries" button (located under the "Display Filter Selection - Device
Summaries" section of the hIOmon WMI Browser "View - Filter Selections" display) and then click on the
"Get Device Summaries" button; the
underlying display table will then show the various filter option settings for
each of the two Device Summaries associated with the
WMIsampleFilters Filter Selection.
Adding, Modifying, and Deleting Filters
The hIOmon
WMI Browser "Modify -
Filter Selection" display provides various options
that can be used to modify the Filters associated with a Filter Selection,
delete a specific Filter from a Filter Selection, and also add a new Filter to a
Filter Selection. You can also create a new Filter Selection by adding a
Filter to a new Filter Selection name. Please be sure to look at the
explanations (click on the "?" within the hIOmon WMI Browser menu bar while
displaying the "Modify - Filter Selection" display panel) regarding the use of
the various options that can be used to modify Filter Selections. Also
note that you can use the "Add/Modify/Delete - Device Summary Filters" section
of the hIOmon WMI Browser "Modify - Filter Selection" display to modify the
Device Summaries associated with a particular Filter Selection.
NOTE: Please be sure to remove any
Filters that represent floppy, CD, or DVD lettered
drive paths (otherwise you will encounter an error message when the hIOmon
I/O Monitor tries to "Load" the Filter Selection; "Loading a Filter Selection"
is further described below).
Default Filter Selection
After you have made your changes (if any) to the Filters defined within the
WMIsampleFilters Filter Selection, you can optionally make this Filter Selection
the ‘default’ Filter Selection by using the "Make Default" button provided
within the hIOmon
WMI Browser "Modify - Filter
Selection" display. The "default" Filter Selection is
automatically loaded into the hIOmon
I/O Monitor when the hIOmon
Manager "AutoStart" option is
enabled to automatically activate file I/O operation monitoring by the hIOmon
I/O
Monitor when the hIOmon
Manager is started.
Loading the Filter Selection
The final step in selecting the particular files to be monitored is loading
the Filter Selection into the hIOmon
I/O Monitor. The hIOmon
WMI Browser "Modify - Filter Selection" display provides a "Load" button to perform this
"load" operation. This option notifies the hIOmon
Manager that it is to pass the selected Filter Selection down to its associated hIOmon
I/O
Monitor; consequently, the selected Filter Selection will be used by the hIOmon
I/O Monitor when file
I/O monitoring is activated within the hIOmon
I/O Monitor; see the explanation
within the hIOmon
WMI Browser "Modify - Filter Selection" display for more information.
Also note that as a result of the Installation
Default Settings
(see the hIOmon
User Guide for more information
), the hIOmon
Manager will normally have automatically activated the
collection of file I/O operation performance information by the hIOmon
I/O Monitor
when the hIOmon
Manager is started. If
you need to manually activate the collection of I/O operation performance
information by the hIOmon
I/O Monitor, you can use the "enable file I/O
operation monitoring" option provided by the hIOmon
WMI Browser "Modify - I/O Monitor" display.
In Summary
In summary, the steps required to specify the particular files to be
monitored by the hIOmon
I/O Monitor are:
-
Create (or modify) a Filter Selection that contains the Filters
representing the particular files that you want monitored, the type of
information to be collected (e.g., summarized performance metrics), and the
manner in which the collected information is to be offloaded to the hIOmon
Manager (e.g., periodic basis or Alert threshold). You can use the "WMIsampleFilters"
Filter Selection initially or as a template.
-
Load the Filter Selection into the hIOmon
I/O Monitor so that it can be
used by the hIOmon
I/O Monitor in determining which particular files are to
be monitored along with the types of I/O operation information to be
collected.
The hIOmon
WMI Browser "Modify -
Filter Selection" display can be used to create, modify and load Filter
Selections; the "View - Filter Selection" display can be used to view the contents and
current status of Filter Selections.
NOTE: Please note that, depending upon the number and type of files selected to be
monitored (along with the actual amount of associated file I/O activity), the
quantity of I/O trace information collected by
the hIOmon
I/O Monitor can vary and sometimes become quite large. As
a first step, we recommend that you consider the use of the hIOmon filters and summary capabilities to begin your observations
of file I/O operation performance from the overall perspective (i.e., a "top-down" approach); the
Alert options, along with the ability to display the summarized file I/O
operation performance information in a sorted order based upon a selected
performance metric, can be especially helpful in this regard. Then, based upon the file I/O operation performance information
results provided by hIOmon, drill-down as necessary to the particular files of interest. (The more advanced
features of hIOmon, such as the support for "replay" mode and the ability to
configure hIOmon
I/O Monitor memory usage, do allow you to completely capture,
if necessary, the entire I/O trace information for highly
accessed files).
