Hello Andreas,
The value of this parameter (RestartVolumeGroupingMemorySize) defines the amount of memory (in KB) used for grouping of used blocks by volume in the course of a system restart. Using this kind of grouping may speed up the restart in case of huge databases. The default value of 0 means that no grouping by volume takes place.
This parameter potentially improves restart performance, but only in those (rare) cases when the system is CPU bound during restart (we would normally expect it to be IO bound). Increasing this parameter will allocate more memory in one chunk, which we have seen to be benefitial on Solaris OS. If you have any system with long restart times, create a SAP message and we will check, if there is room for improvement, otherwise, just leave the parameter value at its default of '0'.
For more information run "param_getfull RestartVolumeGroupingMemorySize"
Regards, Yashwanth
