Using IBM Rational Developer RDz and Carma with Endevor may require some adjustement of the LSR buffer pool.
When you define the LServ buffer POOL using the command ADDPOOL, you may need to increase the STRNO(VSAM placeholders allocated for the file).
The default value is 32 but it is likely that this value is too small when using RDz/Carma, due to inventory sweeps.
Symptom is hangs of the TSO/Endevor sessions.
In that case, you have to increase the STRNO value on the ADDPOOL statements to which MCF's map, for example:
'ADDPOOL 01 (2048,199) (8192,299) STRNO(255)'