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dxpresto(8X) dxpresto(8X) NAME dxpresto - Graphically displays Prestoserve state and statistics. SYNOPSIS /usr/bin/X11/dxpresto [-options] [hostname] OPTIONS Specifies the color of the window's border (color displays only). The default is black. Specifies the color of the window's background (color displays only). The default is white. Specifies the display screen on which dxpresto displays its window. If the display option is not specified, dxpresto uses the display screen specified by your DIS- PLAY environment variable. The display variable has the format host- name:number. Using two colons (::) instead of one (:) indicates that DECnet is to be used for transport. The default is :0. For more in- formation, see X(1X). This option is the same as the -d option. Spec- ifies the color of the text (color displays only). The default is black. Specifies the width, length, and location of the dxpresto win- dow. If the geometry option is not specified, dxpresto uses default values. The geometry option has the format =[width][xlength][x][y]. For more information about the screen coordinate system, see X(1X). DESCRIPTION The dxpresto command is an X Window System application that graphically displays a machine's Prestoserve state and statistics. The dxpresto command uses a Remote Procedure Call (RPC) protocol to communicate with the machine being monitored. You use the dxpresto command to provide general information about Prestoserve and to help manage Prestoserve. Also, you can use the command to demonstrate the efficacy of the Prestoserve software. Use the hostname variable to specify the machine that you want to moni- tor; the machine must be running the Prestoserve software. If hostname is not specified, the local machine running the Prestoserve software is monitored. If hostname is not specified and the local machine is not running the Prestoserve software, the dxpresto window opens but it is not functional until you enter the name of a host running the Prestoserve software in the Host field. Note The machine that you want to monitor must be running the prestoctl_svc daemon. Also, if you want to be able to enable or disable Prestoserve on the machine, it must be running the prestoctl_svc daemon with the -n option. The portmap daemon must be running if you want to use dxpresto . Because dxpresto is an X Window System application, your DISPLAY envi- ronmental variable must be set to a machine that is an X Server. For more information, see X(1X). dxpresto Window The dxpresto window contains the following information: Shows the name of the host that you are monitoring. You type a host name in the field and hit the Return key to monitor that host. Show the Prestoserve state, either Enabled (UP), Disabled (DOWN), or Error (ERROR). If the machine being monitored is running the prestoctl_svc daemon with the -n option, you can change the machine's Prestoserve state to either En- abled (UP) or Disabled (DOWN) by clicking on the appropriate button. You cannot click on the Error button; contact the server administrator or the server hardware Field Service representative if the Error button is enabled. Displays the interval of time in seconds between Prestoserve queries and allows you to change that interval. When you invoke the dxpresto command, the default sample interval is 5; there- fore Prestoserve information is gathered every five seconds. For exam- ple, if you want Prestoserve queried more often, move the slider to the left and click on MB1 until 2 appears; Prestoserve is then queried every two seconds. Shows the time since Prestoserve was last enabled. The time is displayed in hours, minutes, and seconds. The total number of seconds is also shown. Show the state of the Prestoserve backup battery system. An intact battery icon with the word ok indicates that the battery has sufficient power. An intact battery icon with the word low indicates that the battery's power is low. A broken battery icon indicates that the battery is disabled. Prestoserve goes into the ER- ROR state when the backup battery power falls below a minimum amount. Contact the server administrator or the server hardware Field Service representative if a battery is low or disabled. Displays the number of Kbytes of nonvolatile memory that the Prestoserve cache is utilizing. Note that Prestoserve can utilize less than the default maximum size of its Prestoserve cache if you changed the cache size with the presto -s command. Allows you to display or to not display graphs that demon- strate how the Prestoserve cache is being utilized. Allows you to dis- play or to not display the Prestoserve cache statistics table. Allows you to exit from dxpresto. Displays error messages and informational messages for both Prestoserve and the dxpresto command. For example, if the prestoctl_svc daemon with the -n option is not running on the machine you are monitoring, a message is displayed indicating that changes to Prestoserve operation are not allowed. Some error messages, such as those indicating RPC communication failure, are displayed on the terminal from which you invoked the dxpresto command. Cache Utilization Graphs If you enable the Display Cache Utilization graphs, the following is displayed: Shows how the Prestoserve cache operations are distributed among the four Prestoserve buffer states: dirty, clean, inval, and ac- tive. The vertical axis shows the maximum number of objects or disk blocks that the entire Prestoserve cache can contain. The sum of the four bars is the total number of buffers used in the Prestoserve cache. Note that the size of the Prestoserve cache can be changed by using the presto -s command. Shows a recent history of the average number of writes per second over the time intervals that are determined by the sample interval. Each point in the horizontal axis represents a sample time in- terval as determined by the sample interval; the maximum number of samples that can be shown is 210. When you reach the maximum number of samples, the graph shifts to the left so you can see at least the last 105 samples, which is half the maximum number of samples. If you choose 5 as the sample interval, Prestoserve is queried every five seconds; therefore it takes 1050 (5 x 210) seconds to obtain the maximum of 210 samples. The vertical axis shows the average number of writes performed per second within the sample time interval as determined by the sample interval. For example, if you choose 2 as the sample interval, Prestoserve is queried every two seconds, and each point in the graph shows the average number of writes performed within the interval of two seconds. If the graph shows that an average of 5 writes per second were performed within two seconds, Prestoserve actually performed 10 writes within those two seconds. The calculation is: 5 writes ---------- x 2 sec = 10 writes sec If you change hosts, the Writes per second graph displays a ver- tical line of dashes to distinguish the new host's information from the previous host's information. Shows a recent history of the average number of Prestoserve cache hits per second over the time intervals that are determined by the sample interval. The Prestoserve cache hits represent the total number of clean and dirty read and write hits (blocks that match blocks already in the cache). Each point in the horizontal axis represents a sample time in- terval as determined by the sample interval; the maximum number of samples that can be shown is 210. When you reach the maximum number of samples, the graph shifts to the left so you can see at least the last 105 samples, which is half the maximum number of samples. If you choose 2 as the sample interval, Prestoserve is queried every two seconds; therefore it takes 420 (2 x 210) seconds to obtain the maximum of 210 samples. The vertical axis shows the average number of hits performed per second within the sample time interval as determined by the sam- ple interval. For example, if you choose 10 as the sample interval, Prestoserve is queried every 10 seconds, and each point in the graph shows the average number of hits performed within the in- terval of 10 seconds. If the graph shows that an average of 2 hits per second were performed within 10 seconds, Prestoserve actually performed 20 writes within those 10 seconds. The calcu- lation is: 2 hits ---------- x 10 sec = 20 hits sec If you change hosts, the Hits per second graph displays a verti- cal line of dashes to distinguish the new host's information from the previous host's information. Cache Statistics Table If you enable the Display Cache Statistics table, the following is dis- played: Allows you to display Prestoserve statistics since Prestoserve was last enabled. This is useful when you want to determine how Prestoserve performs over a long period of time. Allows you to display the Prestoserve statistics for each sample time interval as determined by the Sample Interval slider. If no Prestoserve activity occurs dur- ing the time interval, the numbers in the statistics table are zero. For example, if the Sample Interval slider is set to 5 and the Since last Sample button is enabled, the statistics table shows the Prestoserve statistics for each interval of five seconds. Allows you to display Prestoserve statistics since you clicked on the Zero button. This button allows you to determine how Prestoserve performs over a specific period of time that you can set by using the Zero button. Al- lows you to set a time reference for the Prestoserve statistics table. If you click on the Zero button and, at a later time, click on the Since last Zero button, the table displays the Prestoserve statistics since you clicked on the Zero button. Shows information similar to the information that is displayed when you use the presto -p command. For each Prestoserve cache read or write operation, Prestoserve increments an appropriate counter. The table shows: The Write Cache Efficiency, which the ratio of write dirty hits to the number of writes copied into the Prestoserve cache The Count, which is the sum of the clean hits, dirty hits, and allocations, and passes The Hit rate percentage, which is the ratio of clean hits and dirty hits to the total count The Clean hits counter, which is the number of hits on the clean buffers The Dirty hits counter, which is the number of hits on the dirty buffers (each dirty hit represents a physical disk write that was avoided en- tirely) The Allocations counter, which is the number of new buffers that had to be allocated for disk block images The passes counter, which is the number of I/O operations that Prestoserve passed directly to the actual device driver X DEFAULTS The dxpresto application uses the values in the file when you logged in and uses the appropriate resource specification to customize the ap- pearance or characteristics of its displayed dxpresto window. The for- mat for a resource specification in the file is: name*resource: value Specifies the application name or the name string that restricts the resource assignment to that application or to a component of an appli- cation. If this argument is not specified, the resource assignment is globally available to all X applications. Specifies the resource. Specifies the value that is to be assigned to the resource. For more information, see X(1X). Because each toolkit-based application can consist of a combination of widgets (for example, push buttons and a scroll bar), you can form the name string by adding widget class and name identifiers to the string. For further information about adding class and name identifiers, see X(1X). For dxpresto, the available name identifiers are: The dialog box con- taining all of the graphs The graph displaying dirty buffers The graph displaying clean buffers The graph displaying inval buffers The graph displaying active buffers The graph displaying cache write history The graph displaying cache hit history EXAMPLES The following is an example of the suggested resource values: DXpresto*background: darkslategray DXpresto*fore- ground: wheat1 DXpresto*borderColor: gold3 DXpresto*graph_parent*borderColor: firebrick DX- presto*dirty_graph*highlight: gold3 DXpresto*dirty_graph*back- ground: black DXpresto*clean_graph*highlight: gold3 DX- presto*clean_graph*background: black DXpresto*inval_graph*high- light: gold3 DXpresto*inval_graph*background: black DX- presto*active_graph*highlight: gold3 DXpresto*active_graph*back- ground: black DXpresto*write_graph*highlight: gold3 DX- presto*write_graph*background: black DXpresto*hit_graph*high- light: gold3 DXpresto*hit_graph*background: black DXpresto*topShadowColor: gold2 DXpresto*bottomShadow- Color: gold4 DXpresto*armColor: gold3 DXpresto*selectColor: gold3 DXpresto*presto_on.se- lectColor: green DXpresto*presto_off.selectColor: yellow DXpresto*presto_error.selectColor: red FILES SEE ALSO X(1X), dxsession(1X), presto(7), portmap(8), presto(8), prestoctl_svc(8) Guide to Prestoserve dxpresto(8X)