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GLYPH<SM590000> NUM 15 MIN INTVL: Shows the number of intervals in the hour the deferred throttling occurred. A 4 means that in every interval of the 1-hour report, deferred throttling occurred. A 1 means, that only in one interval deferred copy throttling occurred. 

GLYPH<SM590000> NUM 30 SEC SMPLS: Shows in how many 30-second samples in the reported intervals the throttling occurred. Therefore, in an hour report, a maximum of 120 samples (60 minutes * 2 samples of 30 seconds each) are available. If 1 is reported, a deferred throttling occurred only in 30 seconds of the whole hour. 

GLYPH<SM590000> AVG SEC INTVL: Shows the amount of penalty in seconds that is given for each deferred copy action in this interval. 

Looking at Figure 11-28, you find one interval where deferred copy throttling occurred in all 120 samples. The maximum value of .125 s penalty for each copy operation results. However, in the report that is shown, no interval existed in which no deferred copy throttling occurred, but limited throttling was measured in some intervals. 

Be aware, that depending on your network, a throttling higher than 20 ms normally results in little or no deferred copy action. For more information how to influence the deferred copy throttling, see 12.7.6, “Tuning possibilities for copies: Defe rred copy throttling” on page 727 

## H32TDU12: hNode Library Historical Drive Activity 

The report H32TDU12 gives you an overview about the usage of the backend drives. Example 11-17 on page 675 shows the following information: 

GLYPH<SM590000> How many physical tape drives were installed, and how many were available 

GLYPH<SM590000> How many drives (MIN/AVG/MAX) were mounted 

