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Displaying statistics for the PSS coupling facility structure

The Coupling Facility structure subpanel provides information about the cache, link, and list structure for the extended buffer.

An example of this panel is displayed in the following figure:

     Coupling Facility structure on 05/05/2008 at 14:16:15            
                                                                           
   Structure name  : XBMQA2_CACHE1         Type : Cache                  
   Connection name : IXCLO0D50001          Size : 200192 KB              
                                                                        
   Data bytes used :          2 KB Used pct  . . . :          0 %        
   Directories . . :      52287    Used pct  . . . :          0 %        
   Directory reads :          0    Buffer fulls  . :          0          
   Deletes . . . . :          0    Timeouts  . . . :          0          
   Data bytes HWM  :          2 KB Directories HWM :          1          
                                                                          
                          Reads           Writes                          
   Total . . . . . :          1              1                          
   Failures  . . . :          0                0                          
   Rate  . . . . . :          0                0                         *
   Xfer  . . . . . :    .000029          .011551

The following table describes the statistics that the subpanel provides.

Field

Description

Structure name

Name of this coupling facility structure

Type

Type of coupling facility structure (cache or list)

Connection name

Unique ID that the coupling facility assigned to this structure connection

Size

Size of the structure allocated in the coupling facility

Data bytes used

Number of bytes of the allocated storage currently in use for this structure

Used pct

Percentage of the allocated storage for the coupling facility structure data area that is currently in use

If 100 percent of the data area or directories is used, the coupling facility cannot process XBM requests.

Directories

Number of directory entries used to track eligible data set

Used pct

Percentage of the total directory entries that are currently in use

If 100 percent of the data area or directories is used, the coupling facility cannot process XBM requests.

Directory reads

Number of reads from the cache structure’s directory

This field remains at zero for the list structure because the list structure has no directory.

Buffer fulls

Number of times that a local buffer filled while reading from the directory for the cache structure

Deletes

Number of times that data was deleted from this structure

Timeouts

Number of times that access attempts to this structure timed out (returning no data)

Data bytes HWM

High-water mark (the largest amount at one time) of data bytes occupying the allocated storage for this structure

Directories HWM

High-water mark (the largest amount at one time) of directories occupying the allocated storage for this structure

Total - Reads

Number of reads that this structure satisfied

Failures - Reads

Number of failures that occurred during attempts to read from this structure

Rate - Reads

Rate (in I/Os per second) at which data is read from this structure

Xfer - Reads

Read transfer response time (in seconds) when data is read from this structure

Total - Writes

Number of writes that this structure satisfied

Failures - Writes

Number of failures that occurred during attempts to write to this structure

Rate - Writes

Rate (in I/Os per second) at which data is written to this structure

Xfer - Writes

Write transfer response time (in seconds) when data is written to this structure

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