The following table lists some of the most common MVS system address spaces:
| Adress Space | Description |
|---|---|
| ANTAS000 | Concurrent Copy Support |
| ANTMAIN | Concurrent Copy support |
| BPXOINIT | USS Address Space initiators |
| CATALOG | Catalog Address Space – Handles DISP=SHR, DISP=OLD, and DISP=(…,CATLG) |
| CONSOLE | Console Task – operator’s interface |
| DLF | Data Look aside Facility – sharable data in memory (part of LLA) |
| DUMPSRV | Dump Services – writes dumps in case of failure |
| EPWFFST | First Failure Support Technology (makes sure all required information is captured in case of a failure) |
| FTPD1 | FTP Server Daemon (part of TCPIP) |
| GRS | Global Resource Serialisation |
| IOSAS | IO Supervisor |
| IXFLOGR | System Logger |
| JES2 | Job Entry Subsystem |
| JES2AUX | JES2 Additional Support |
| JES2MON | JES2 Monitor |
| JESXCF | JES Common Coupling Facility |
| LLA | Library (Linklist) Look aside Facility |
| MMS | MVS Message Service |
| MSOAPROC | Msys for Operations |
| OMVS | Open Edition MVS (USS/UNIX) |
| PCAUTH | Cross Memory Support |
| RACF | RACF Started Address Space |
| RASP | Real Storage Manager |
| RESOLVER | DNS (Domain Name Services) Resolver (part of TCPIP) |
| RMF | Resource Measurement Facility – performance monitoring |
| SMF | System Management Facility – system usage |
| SMS | Storage Management Subsystem – handles allocation of DISP=NEW datasets |
| SMSPDSE | SMS PDSE Support |
| SYSLOGD1 | USS/UNIX System log |
| TCPIP | Internet Protocol (part of VTAM) |
| TNF | Communications Server Termination Notification Facility (part of TCPIP) |
| TRACE | Trace facilities |
| TSO | Time Sharing Option |
| VLF | Virtual Look aside Facility (part of LLA) |
| WLM | Workload Manager |
| XCFAS | Cross System Coupling Facility – how multiple zOS images talk to each other |
| VCMF | Communications Server Virtual Machine (used by older versions of TCPIP) |
| VTAM | Virtual Telecommunications Access Method – green screens & more. Controls TCPIP; talks to the communication hardware. |
Your explanation is clear! Thanks U very much! 🙂