Changing the frequency of running on-demand migration again on a volume that remains at or above the high threshold

After a volume is processed using on-demand migration it can remain at or above the high threshold. This happens when there are not enough eligible data sets on the volume to be space managed. To prevent continuously processing a volume that remains above the high threshold, an on-demand migration timer is started. This timer prevents on-demand migration from running again for 24 hours (default) on all volumes that remained at or above the high threshold during its duration. When the timer expires, on-demand migration is performed again on all of the volumes that remain at or above the high threshold. A patch is provided to change the frequency at which volumes at or above the high threshold are selected for on-demand migration again.

For example, you can use the following PATCH command to change the frequency to 48 hours:

PATCH .MGCB.+138 X'0002A300' /* 48 hours in seconds */

To restore the default frequency issue:

PATCH .MGCB.+138 X'00015180' /* 24 hours in seconds - default value */

Note: The value specified in the patch is the number of hours expressed in hexadecimal seconds.