By default, IMS limits
the number of OTMA descriptors that you can define to 255 type-M descriptors
and 510 type-D descriptors. You can change these limits.
OTMA descriptors are stored in the extended common storage
area (ECSA). Limiting the number of OTMA descriptors that you can
define ensures that the descriptors do not use too much storage.
Usually,
the amount of storage that OTMA uses for OTMA descriptors at any point
in time is less than the defined maximum limit because OTMA allocates
only enough ECSA storage for the OTMA descriptors that are currently
defined.
To change the maximum number of OTMA descriptors that
can be defined:
- If your DFSYDTx member already contains
a DFSOTMA descriptor, make sure it is one of the first 255 type-M
descriptors listed in the DFSYDTx member of the IMS PROCLIB data set.
Recommendation: Code the DFSOTMA descriptor
as the first entry in the DFSYDTx member so that
it is easy to find and there is no risk of it being listed after the
255th type-M descriptor.
- If your DFSYDTx member does not contain
a DFSOTMA descriptor, create one. It must be one of the first 255
type-M descriptors listed in the DFSYDTx member
of the IMS PROCLIB data set.
Recommendation: Code the DFSOTMA
descriptor as the first entry in the DFSYDTx member
so that it is easy to find and there is no risk of it being listed
after the 255th type-M descriptor.
- In the DFSOTMA descriptor, specify the new maximum number
for the type-D or type-M descriptor.
- For type-D descriptors (destination descriptors), specify
the new maximum number on the DDESCMAX parameter
- For type-M descriptors (client descriptors and the DFSOTMA
descriptor), specify the new maximum number on the MDESCMAX parameter
- Restart IMS to add
the new or updated DFSOTMA descriptor to the online IMS system
