Hi folks,

as I mentioned later, I post IBM answer at PMR:

DFSMS : Managing Catalogs explains in topic "Specifying the Number of
Concurrent Requests" the paameter STRNO. This is the number of
concurrent read requests for a BCS and can have from 2 to 255.
>From this manual:
.
Initially define the catalog with STRNO(3). You can monitor the adequacy
of this value by using the Resource Measurement Facility (RMF) to watch
for enqueues on the resource SYSZRPLW.catname, and I/O contention on
catalog volumes. SYSZRPLW is the major name of the resource, and catname
(the name of the catalog) is the minor name. An indication of enqueue
contention is given by the I/O service times, not necessarily the number
and frequency of enqueues on this resource.
.
Seeing reported pmrs, in calalog heavy used, STRNO=3 may be too low and
it is recommeded to set STRNO of 5 - 7. This is also indicated on apar
II10752.


Regards
Christian Blesa
DMR-Qualitas

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