An SM pubset consists of a control volume set and a number of “normal” volume sets.
The file catalog of an SM pubset is distributed to the individual volume sets in such a way that every subcatalog contains the information for the files on the corresponding volume set.
Figure 10: Structure of the file catalog of an SM pubset
When several SF pubsets are merged to form an SM pubset, you must remember that the values for the CMS buffers are adapted in the MRSCAT.
When the values are simply added, better catalog performance generally results on account of the better equalization of load fluctuations on the catalog.
The following other global subcatalogs are on the control volume set and should be divided up there among several volumes.
Subcatalog for migrated and empty files
Subcatalog for files on private volumes
Subcatalog for job variables
Other subcatalogs on the control volume set ($NLO, $NLC, $PFI) are used exclusively for data security.
The central user catalog is also on the control volume set.
The structure of the individual subcatalogs corresponds to that of the TSOSCAT file of an SF pubset. Therefore, when creating these subcatalogs the same recommendations apply as for creating TSOSCAT on SF pubsets.
Use of SCA is not possible; accelerated catalog access is already implemented internally.