Hitachi Cache Manager User's Guide (HIT1642-96001, June 2007)

4-14 Performing Cache Manager Operations
Hitachi Cache Manager User’s Guide
Using DSMODE to Define Tracks for Dataset Statistics
Figure 4-17 illustrates DSMODE command parameters. The DSMODE
command allows you to define a cache extent for dataset statistics information
and then release it. Once the dataset is defined, Cache Manager can display
I/O counts for each extent (refer to Figure 4-8).
• ENABLE will set dataset statistics information for the specified area,
defined either by VTOC or DATASET.
• DISABLE will release dataset statistics information, defined either by
VTOC, DATASET, DKU (all tracks on a particular volume), or
ECCENTRICAREA. An ECCENTRICAREA is a cache extent that does not
belong to a dataset managed by the VTOC.
Note: If you specify DKU or ECCENTRICAREA, do not use VTOC or
DATASET.
• You can specify target data by DDNAME (using volume, unit and disp
number), VOLUME (volume serial number) or DEVICE (device number).
ENABLE | DISABLE ]
DDNAME (dd name)
VOLUME (volume serial number)
DEVICE (device number)
[ VTOC | DATASET (dataset name)]
[ DKU | ECCENTRICAREA ]
Figure 4-17 DSMODE Command Parameters