My Mainframe

7/31/2019 My Mainframe

1/16

MAINFRAME DASD CATALOG JCL SMF

SMP SMS IPL


2/16

MAINFRAME

Def: high end server also called as

big iron

Components:

1. More than one processor2. Main memory

3. Elements (Many elementscombined

Together formMainframe,

Dont have

Optional Elements: if we want we

Can install

Types

:

Base Element:We have to pay for this along withMF. It is must for mainframe.List:

JES2TSO/EISPFMVS/ESASMP/E

DFSMSdfpACF/VTAMGDDMBOOK MANAGER READERUNIX SYSTEM SERVICESSOMobjectS for MVS RTLGDDM/MVS

Processing: (executing a job or aprogram)

1. Batch Processing:No interaction b/w u & urSystem. JCL will ctrl the job.

JES acts as a OS for JCL.2. Online Processing:

There is an interaction b/w u &

ur system e.g: CICS.

Features:1. Before 750 MIPS now 8000

MIPS2. Storage & retrieval is faster3. Zero down time

4. High security (virus cant beuploaded)

5. We can startup & shutdownLPAR individually is called IPL.

Priced:

Unpriced:


3/16

To create volumes in empty DASD-

ICKDSF

DASD (DIRECT ACCESS STORAGE DEVICE)

DASD is segregated into

Disk(depends on DASD) is

segregated into

Volumes (1v=800c) is segregated

into

Cylinders (1c=15t) is segregated into

Tracks (1t=47 or 56 kb) issegregated into

Blocks (1b=4kb)

Types: DS6000,DS8000Units: 3380,

3390(new)

DASD a storage where we

store our datas in dataset

Virtual Storage:False memoryOne of our volume in DASDUsed to increase execution speedFrequently used datasets are stored

here with the help of PSW (PgrmStatus Word)


4/16

Search Order:

Std level : 1 alias related to 1

catalog

Multilevel search: 1 alias

related to more than 1 catalog

Catalog Creation:

// SYSIN DD*

DEFINE USER CATALOG (NAME (CATALOG.MASTER.VR14CAT)

VOLUME (R14CAT)-

CYL/TRK/VOL (3, 3)-

ICF CATALOG-

INDEXED-

BUFND- (to specify no. of buffers for transmitting data b/w virtual & aux strgdefault strno+1)

BUFNI- (to transmit index frm virtual to aux)

STRNO (3)-(it limits no of user access)

/*

CATALOG DEF: Itself a dataset whichcontains info about another

dataset

PURPOSE :No need to

memories where our dataset

resides (i.e. volume serial

no)

BASIC TYPES OF CATALOG: (BY

FUNCTION)

Master catalog(1ly 1 for MF)

Collection of BCS+Sys relatedinfo

We must specify this is ourmaster catalog in SYSCAT aftercreating catalog

SYSCAT R14CAT 113C

Catalog type catalogaddress space

CATALOG.MASTER.VR14CAT

User catalog(depends on DASD)

Collection of alias +dataset

At least 3000 alias

TYPES OF CATALOG:

ICF:

Bcs(1ly in any 1 volume , ksds)

SPLITTING: 1BCS is into

n no.

MERGING:n no of BCS is

+ into 1

Vsam: has

Volume, ownership,

associated info& security.

Non Vsam: has

Volume, ownership & associated

info

VVDS: (ESDS)

Extension of VTOC, it gives info

abt free space to SMS

VVCR: has VSAM volume ctrl info

NVR: has non VSAM info

VVR: has vsam info

VSAM

OSCVOL(os ctrl volume)

PGRM WITH FIELD EXP:

//STEP1 EXEC PGM=IEFBR14

//SYSPRINT DD SYSOUT=*

//SYSIN DD *

/*

keyword parameter

//

CLASS=A,MSGCLASS=T,MSGLEVEL=(1,1),NOTIFY=&SYSID,TIME(1),TYPRUN={SCAN/HOLD},RESTAR

T=STEPNAME

DSN=Q1 .Q2 .Q3

.Q4.Q5

Q1-Q5=8*5=40 + 4 SEPERATORS

Alias Dataset Dataset type

//DD1 DD

DSN=ARICH02.RAKE.PS,

Disp=(status, normal termination,abnormal termination)Status=(new/old/mod/shr)n.t=(catlg/uncatlg/delete/keep/pass)a.t=( catlg/uncatlg/delete/keep)default=(new,delete,delete)

//

DISP=(NEW,CATALOG,DELETE),

// SPACE=(TRK(2,2),RLSE),

SPACE=(S1,(S2,S3,S4),S5,S6,S7)S1=TRK, BLKSOZE, MB, KB, CYLS2=PRIMARYS3=SECONDARYS4=DIRECTORYS5=RLSES6=CONTIGS7=ROUND

positional parameter

//ARICH02 JOB (123,RAKESH),

DCB=(LRECL=80,BLKSIZE=800,RECFM=FB)D

vsamnonvsamsyslogv lrecl(min=1)32761(max)32

760(max)32767(max)blksize(min=1)32761(max)

32760(max)32767(max)RECFM(RECORD FORMAT)

=FB/VB/U/FBA/VBA/F/V

//

DCB=(LRECL=80,BLKSIZE=800,RECFM=F

B)

Format of JCL or Variousfields of JCL:

Column1, 2 identifier field (//)3-10 name field11, 16blank space12-15 operation field (job, exec,dd)17-72 operand fields73-80 command field

JCL(JOB CONTROL

LANGUAGE)

Jcl is used to define & ctrl

the job to the system

Interface b/w OS& program

Components:

JOB(1ly 1/pgrm)

Tells beginning

of pgrm to JES & gives

accounting info

EXEC(255/job or pgrm)

Used to execute

a job & here we haveour pgrm name

DD(3273/exec)

We have 255 *

3273=834615 DD for a

job


5/16

}exec statement


6/16

JCL UTILITIES:

1 IEBGENER

Copy one sequential file to another Create datasets with input dataset as DUMMY

2 IEBCOPY

Copy the partitioned datasets

Compress the partitioned datasets

Include members of PDS within a copy transaction

Exclude members of PDS within a copy transaction

3 IEHPROGM

Catalog datasets

Un-catalog datasets

Rename the datasets

Create the index for a generation data groups

Delete the Index for a generation data groups

4 IEBCOMPR

Compare two partitioned datasets

Compare two sequential datasets

5 IEFBR14

Create a empty dataset

6 IEEPROGM

Create generation data groups

ABEND CODES

1 S0C4 Caused by the subscript being

out of range

2 S0C5 Caused by invalid address

specification. I.e. The address points to

an instruction, control word or data

outside the available real storage

3 S0C7 Caused by a bad data. i.e. Data

exception. When we are moving an

alphanumeric field to a numeric

computational field this Abend occurs.

The result is an Abend failure

4 S222 Caused by a job being cancelled

by the operator, due to a request by the

program for an unavailable resource.

5 S237 Caused by end of volume being

encountered.

6 S322 Caused when CPU time assigned

to the job, job step, or procedure has been

exceeded. i.e. Time out error.

7 S413 This abend occurs if the DD

statement referenced by UNIT=AFFstatement is not closed before the DD

statement that comes before it.

8 S522 Caused when a wait state exceeds

an installation-defined time limit.

9 SB37 Caused by lack of sufficient

Secondary space


7/16

Types of SMF recording:0 only IPL info0:255 record infofrom IPL30 TSO72-79 record RMFinfo80,81,83 RACF info only

Commands:/D smf to view status ofMandataset/I smf to change MandatasetManuall

IFASMFDP

pgrm

Taking dump to PS(destination)& release to Active State

To segregate info in table

form (formatted way)toanother PS

Status of MANDATASETAlternate

(during MANDATASET creation)

Active

(when we insert data)

Dump required

(when a dataset is full

it goes to dump required)

Stage1

SM0,SM

1,sm2

Stage2

Sm1,sm

2

Sm0

---------

Stage 3

Sm2

Sm1

Sm0

(source)

ICETOOL

after full of mdswe get IEE362I(or)IEE362A

SMFPRM00To mentionthese are my

MANDATASET Diff b/w MANDATASET &syslog:Both have same info but tostore in req format we useMANDATASET

SMF(system management ormeasurement facility)

To start -->setsmf=00

To stop-->setsmf=01

Parmlib mem

SMFPRM

Sub systemOptional elementCollection of systemrelated + userrelateinfo

ESDS type datasetTechnical nameMANDATASET(pgrm to create is

IDCAMS)

List of MANDATASET:

SYS1.MAN0SYS1.MAN1

SYS1.MAN9RequirementAt least =2, max=0-9


8/16

Used to install, monitor s/w

pdts

(system modification program)

Server pack : machine level, only replace, 1yvalidity,

no update, high cost.

System pack

CBPDO:- human level, can rectify fault, life

time validity, low cost

Software excel:

Is a toolSubsystemBase element

Used to install, Monitoros & s/w

pdt

Basic types

FUNCTION SYSMOD

To install new pdt for 1st time

Only for machine level language

Dependent (eg: CBPDO)

Independent (eg: server pack)

APAR (AUTHORIZED PGRM ANALYSIS REPORT)

If any error after os installation

ADMIN identify(fix) errors & send t0

IBM Gives solution toadmin

PTF (PROGRAM TEMPORARY FIX)

Collection of APAR with solution By IBM

When error arises in system it check

Ptf & rectify error if there is any fix for that error

It is only for dependent type

USER MOD SYSMOD

All human level language formats are installed using this

So admin can find and rectify the errors

Install it

in mf

via

SYSMOD

Used to install s/w pdt

By function

MCS MT

(MODIFIC

ATION

CTRL

STATEME

NT )

Any pgm

start with

++

(MODIFICA

TION

TEXT)any

machine

readable

fmt pgm

Tech name


9/16

SMS(Storage management

subsystem)

1. Base element2. Subsystem3. Only for SMS we have

classes & groups

4. Without SMS we cant storedata in DASD or tape drives.5. For NON-SMS also SMS will

take care of volumeallocation

Parm lib members we used:IEFSSN--> to invoke subsystemIEFPRD--> to invoke optional

Elements of SMS:

DFSMS DFP Data facility

storage mgntsubsystem

base

element

DFSMS HSM Hierarchical

storage mgr

optional

DFSMS RMM Removable media

member

optional

DFSMS TVS Transactional

VSAM service

optional

DFSMS DSS Data set service optional

Types of classes: (onlyfor sms)

Management classToidentify particular

MainframeStorageclassTo identify particularbranchData class(note:for class creation we needdataset)

Types of groups:

Storage group:A group of >=1 DASD volumes that SMSuses for data set allocation.Aggregate

group:g

Created using ISMF (interactive serviceproductivity facility) panel in ISPF(interactive storage management facility)

Classes & groups are stored in CDS(control data set that too in SCDS Type)CDS TYPES:

SCDSSource ctrl datasetACDSActivity ctrl

dsCOMMDSCommunication ds


10/16

IPL(INITIAL PROGRAM

DEF:

1. Loading part of os from DASD to Real storage through

virtual storage with the help of psw.

2. Startup and shutdown of LPAR

3. According to our req we must customize our parmlib

member & it must be read during IPLing

4. Initialize the registers to zero to avoid wastage of

resources.

Types of starts:1. Cold start:(compared to initial start)

Load or reload PLPA but doesnt preserve VIOdataset

2. Quick start: ( restart )Doesnt reload PLPA & doesnt preserve VIO

dataset3. Warm start: (normal start)

Preserves VIO dataset only (Startup &

Phases of IPL:(Each & every phaseinvokes next phase)

HARDWARE PHASE:SYSRES (or) IPL ABLE disk(it is a DASD volume where our OS is stored in

SYS1.NUCLEUS)It contains BOOTSTRAP module at cyl0, Trk0

Reads IPL CTRL PGRM IEAIPL00 & asses control to it

IRIM PHASE:(IPL resourceinitializationmodule)

Itmakesenvironmentready to loadOS to eal

NIP (nucleus initializationprogram) Our actual OS isloaded with the help of MVSCPcontains s/w details

MSI(master scheduler

initialization)It generates

address space for subsystem byplacing address on that space we

SUBSYSTEM Once MSI is initialized subsystem can be started (in batch processing we cantrun any program without JES so, JES is our primary subsystem)

SYSCTRL FRAME

LOAD ADDRESS: used to specify systemresident volume serial no which is of 4characters.

LOAD PARM:(available in SYSCTRL FRAME)

IODFdddd

(must)

Input output definition fileDevice no of volume containingIODF Dataset(default is SYSRES)

LOADXXxx

Initial message suppression

indicator (optional)

IMSIi

ID of LOADXX member to be

used(default is LOAD00)

NUCXn

Alternate nucleus id (default is

1:IEANUC01)

Reads LOADPARM & hunt for

LOADXX


11/16


12/16


13/16


14/16


15/16


16/16

My Mainframe

Documents

Transcript of My Mainframe