Planning FEPI storage
FEPI does not require any additional MVS™ storage beyond that recommended for basic CICS®.
As for dynamic storage, the storage used by FEPI is allocated exclusively from CDSA and ECDSA; CDSA usage is only that required to support z/OS® Communications Server processing. The following information allows you to estimate the storage requirements of a particular FEPI configuration.
Item | ECDSA | CDSA |
---|---|---|
Basic | 80K | |
For each node | 288 | 180 |
For each node that is currently available for communication | 192 | |
For each target | 236 | |
For each pool | 272 + 64 x (number of nodes in pool) + 64 x (number of targets in pool) | |
For each property set | 176 | |
For each connection (note 1) | 432 if using data stream data 688 if using formatted data | |
For each connection that is currently available for communication | 384 + additional value from Table 2 if using formatted data | |
For each current conversation | 128 | |
For each command in progress | 2.5K + size of user data (Note 2) |
Note:
- The number of connections is (number of nodes in pool) x (number of targets in pool) for each pool.
- This is the data that is to be sent and received, or used for defining resources. If global user exits are used, twice the data size is needed; similarly if journaling is used.
For each connection that is currently available for communication and that uses formatted data, additional ECDSA storage is required; the amount depends on the device type and capabilities defined, as shown in Table 2.
Device type | Basic | Additional for color support | Additional for extended data stream support | Maximum |
---|---|---|---|---|
327x model 2 | 3840 | 1920 | 5760 | 11520 |
327x model 3 | 5120 | 2560 | 7680 | 15360 |
327x model 4 | 6880 | 3440 | 10320 | 20640 |
327x model 5 | 7128 | 3564 | 10692 | 21384 |
Add some contingency (approximately 10%) to your final estimate.