Volume Dataset/Extent Activity

This panel shows activity information for each extend that incurred I/O activity to a single volume during the collection interval. Use this information to analyze I/O activity for a single volume from a Db2 database/spacename/data set perspective.


________________ ZOJV4    VTM     O2       V550.#P SE12 11/06/13 10:27:43   2  
> Help PF1      Back PF3      Up PF7      Down PF8     Sort PF10                
>                                                                               
>         OBJECT ANALYSIS:  Enter a selection letter on the top line.           
>                                                                               
> *-VOLUME EX ACTIVITY                                       C-THREAD ACTIVITY  
=============================================================================== 
>                       VOLUME DATASET/EXTENT ACTIVITY                          
 OJV4                                                                           
+ Interval Time   = 00:05:00                      Interval Elapsed   = 00:02:59 
+ Volume/Unit     = PMOSDB/4C2F                   Total I/O Rate/sec =       .0 
+ Device Type     = 3390                          DB2   I/O Rate/sec =       .0 
+                                                                               
+ Database = DSN00212       Spacename = FOO                 DSN = 001           
+ *                                                                             
+              Low             High             --------I/O Rates/Counts------- 
+ Extent       Page/CCHH       Page/CCHH        Total       Read        Write   
+ ------       ---------       ---------        -------     -------     ------- 
+   001        000000          000000                .0          .0          .0 
+              06B70000        06B7000E               2           1           1 
===============================================================================

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Fields

Interval Time: The collection interval currently in use by the object analysis collector. At the end of this time interval, the collector resets its collection statistics.
Interval Elapsed: The elapsed time within the current collection interval. It is the period of time for which the displayed information is applicable.
Volume/Unit: The name and address of the volume.
Total I/O Rate/sec: The total number of I/Os per second for the volume. This value is from an MVS perspective. If the volume is shared by multiple MVS systems, this value might not reflect all I/O activity to the volume.
Device Type: The device type of the volume displayed.
Db2 I/O Rate/sec: The total number of I/Os per second (for the volume) originating from the Db2 subsystem being monitored. This is a subset of total I/Os per second if I/O to the volume is also occurring from address spaces other than the Db2 subsystem being monitored.
Database: The name of the selected database.
Spacename: The name of the selected space.
DSN: The sequence number of the selected data set.
Extent: The number of an extent that incurred I/O activity.

Each of the following fields includes two values for each extent. The values are displayed one above the other; for example, the Read I/O rate is displayed above the Read I/O count.

Low Page/CCHH: The starting page number (top line) and cylinder/head address (bottom line) of the extent.
High Page/CCHH: The ending page number (top line) and cylinder/head address (bottom line) of the extent.
Total I/O Rates/Counts: The total I/O rate per second (top line) and count (bottom line) that is attributable to the extent for the time elapsed.
Read I/O Rates/Counts: The Read I/O rate per second (top line) and count (bottom line) that is attributable to the extent for the time elapsed.
Write I/O Rates/Counts: The Write I/O rate per second (top line) and count (bottom line) that is attributable to the extent for the time elapsed.