OPC (OPERATION PLANNING AND CONTROL)

OPC is also called as TWS Tivoli Workload Scheduler.

USE : It is used to create or maintain records.

Example:

In a bank,If want to create new account or  to update the details of the existing account, the bank guys will get the details from their customers but the bank employees or not qualified to feed the records in mainframe so what they can do they generate a request to mainframe opc console monitors, they can do the job this is a working principle of OPC.

OPERATIONS:

After logging into the ISPF pane select Z to enter Extra options for opc 32

Now it will show OPS320 pane in this select O for Operation planning and control(OPC)



Now it will show OPC window, in this window MCP(Modify current plan) is most frequently used to edit data.QCP (query current plan) use to view only



In this MCP(Modify current plan)  window there are 9 options.



COMMANDS

I - -> get information
J -- > Edit JCL
C -- > Complete a job
MH -- > Place Manual hold on the job
MR -- > Release manual hold from the job
SJR -- > Job will restarted. Depends on the restart step set in JCL.


RER --> This command is used to restart the application from a specified job. Use “s” to select the job from where the application has to be restarted.
WOC -- > This command puts the entire application on wait till a pre-requisite is met.
CMP -- > Complete the application
MOD -- > Modify the current plan on application level.


Note: There are lots of functions and options in OPC the above is just an idea about OPC


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INTRODUCTION TO IBM MAINFRAME

HMC (HARDWARE MANAGEMENT CONSOLE)

Intro:

The system administrator is able to manage the software configuration and operation of partitions in a server system, as well as to monitor and identify hardware problems. HMCs offer an inexpensive method to administer complex and expensive servers, as a console need only consist of a 32-bit Intel-based desktop PC with a DVD-RAM drive. HMC is used to:

• Configure and manage logical partitions and partition profiles
• Perform DLPAR functions.
• Activate and manage Capacity on Demand resources.

HMC is categorized as hardware HMC and software HMC.

HMC Hardware :

desktop hmc - eg: 7042 c06

rack mount hmc- eg: 7042 cr4

HMC Software:

it is the end user application, there are lots of version in HMC ( v2,v7 Version 7 is the latest )

note: version 7 does not need a WEBSM .

Operating  System Message(osm) window is the window used to enter the commands. the following is the osm window,

The followings are few HMC commands used  in real time:

$P - PURGE

$S - START

$C - CANCEL 

$T - CONTROL 

$E - RESET

$A - RELEASE 

$I - INTERRUPT

$D - DISPLAY 

$N -REPEAT

$B - BACKSPACE 

$H - HOLD

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IPL ( INITIAL PROGRAM LOAD)

TYPES OF IPL:

COLD START: Purge the spool and load PLPA
WORM START : Use the previous data , no PLPA
QUICK START: purge the spool and no PLPA

PLPA: pageable link package area
This area contains SVC routines, access methods, and other READ-ONLY System Programs, along with any READ-ONLY reenterable user programs selected by an installation that can be shared among users of the system.

Process in IPL:

1.Hardware reset
2.Memory clear ( optional)
3.Issue a basic read command to IPL devices ,it reads the records (cyl 0,trk 0 )
4.Start reading the IO devices from record 2.
5.If IO devices are read successfully , it loads PSW (program status word) from location 0.

IPL PARAMETER:

During IPL the system looks for the LOADxx in the following order.
(LOADXX  : information about IO configuration ad master catalog)

1.SYS0.IPLPARM to SYS9.IPLPARM in IODF
2.SYS1.PARMLIB in IODF
3.SYS1.PARMLIB in SYS VOLUME..

IPL FLOW:


1. Stop batch process  ---> $P XEQ

2. Stop printing ---> $P PRT

3. Notify the online users ---> SE " MESSAGE "

4.Stop online systems ---> $P TSO

5.Stop TELNET ---> STOP TN3270

6.Stop TCP/IP ---> STOP TCPIP

7.Stop DB2 ---> -DB01 STOP DB

8. Stop VTAM ---> ZNET CANCEL

9. Purge the Initiator ---> $P INIT

10. Stop JES2 ---> $ JES2.

RELOAD 

1.VARY CN(*),ACTIVATE (Note: after this command only OS starts communicate with  the user)

2.COLD START --->NOREQ,COLD ( Starts VTAM,TELNET and TCP/IP0

3.Start DB2 ---> -DB01 START DB2

4.Start CICS SUBSYSTEM ---> $S KEONCICS ( KEON is our training LPAR).

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