Introduction to zOS Components Base Optional Copyright IBM

Introduction to System z Operating System – z/OS Foundation of mainframe environment Ø z/Architecture (Hardware) An IBM architecture for mainframe computers and peripherals. The System z family of servers uses the z/Architecture. z 800(2066) z 890(2086) z 900(2064) z 990(2084) z 9(2094) z 10(2097) It is the successor to the S/390 and 9672 family of servers. Ø z/OS (System z Operating System) The backbone of the z/OS system is the MVS Basic Control Program (BCP) with JES 2 or JES 3. These provide the essential services that make z/OS the system of choice when you need to process your workloads reliably, securely, with complete data integrity and without interruption. 10/15/2021 © Copyright IBM Corp. , 2008. All rights reserved. 1

Introduction to System z Operating System – z/OS 10/15/2021 © Copyright IBM Corp. ,

Introduction to System z Operating System – z/OS Communications Server TCP/IP support provides a number of standard client and server applications, including: Ø Ø Ø Ø Ø SNA 3270 Logon Services (TN 3270) z/OS UNIX logging services (syslogd) File Transfer Services (FTP) Network Management Services (SNMP Agents, Subagents, Trap forwarding) IP Printing (LPR, LPD, Infoprint Server) Internet Daemon Listener (INETD) Mail Services (SMTP and sendmail) z/OS UNIX logon services (otelnetd) Remote Execution (REXECD, RSHD, REXEC, RSH) Domain Name Services (Caching DNS BIND 9 server) 10/15/2021 © Copyright IBM Corp. , 2008. All rights reserved. 8

Introduction to System z Operating System – z/OS List of z/OS Component 3 Character Identifiers IEA Allocation/unallocation Auxiliary storage manager (ASM) Contents supervision Communications task (COMMTASK) Data Facility Product (DFP) Generalized trace facility (GTF) Initial program load (IPL) Input/output supervisor (IOS) Master scheduler Nucleus initialization program (NIP) Program Call authorization (PC/AUTH) Reconfiguration Recovery termination manager (RTM) Supervisor control System resources manager System trace Timer supervision Virtual storage management (VSM) 10/15/2021 BPX z/OS UNIX System Services $HASP (grandfather exception) JES 2 IGD Storage management subsystem (SMS) IKJ Time Sharing Option Extensions (TSO/E) IOS Input/output supervisor (IOS) © Copyright IBM Corp. , 2008. All rights reserved. 11

Introduction to System z Operating System – z/OS List of z/OS Component 3 Character Identifiers (continued) IEE Auxiliary storage manager (ASM) Communications task (COMMTASK) Data Facility Product (DFP) JES 2 v JES 3 v Master scheduler Reconfiguration Recovery termination manager (RTM) Supervisor control System management facilities (SMF) System resources manager (SRM) System trace v Task management Timer supervision 10/15/2021 IEF Allocation/unallocation Converter/interpreter Data Facility Product (DFP) Initial program load (IPL) Initiator/terminator JES/scheduler services JES 2 v Master scheduler Master subsystem/subsystem interface Scheduler JCL facilities (SJF) Scheduler restart Scheduler services (ENF) System management facilities (SMF) © Copyright IBM Corp. , 2008. All rights reserved. 12