Preparing for Installation › Storage Requirements › Component Installation Requirements › CA-GSS (System Interfaces) Requirements › ISERVE Memory

ISERVE Memory

Each executing copy of ISERVE (including the primary) requires:

• 120 bytes of CSA
• 95.4 KB of ECSA
• 3 MB of private area storage above the 16 MB line

All CA‑GSS programs are re‑entrant, AMODE 31, and RMODE ANY.

ISERVE‑acquired ECSA is retained at termination but released during the next initialization of an ISERVE with an identical subsystem ID. This ensures that cross‑memory ISERVE users are not impacted.

The ISERVE CSA usage includes 40 bytes used for a subsystem anchor block. Whether pre-defined by the installation or dynamically obtained, this block is retained until the next IPL and is reclaimed upon each ISERVE restart.

Each CA Technologies product that is used in conjunction with ISERVE using REXX ADDRESS commands may require additional CSA or ECSA. Check the appropriate documentation for each installed product to determine any additional storage requirements.

The amount of private storage ISERVE requires depends on the options you choose and the amount of traffic on your system. The recommended starting point is 4 MB.