Text preview for : GC21-5111-1_System3_Model15_3340DirectAccessStorageFacilityReferenceManual_Aug77.pdf part of IBM GC21-5111-1 System3 Model15 3340DirectAccessStorageFacilityReferenceManual Aug77 IBM system3 GC21-5111-1_System3_Model15_3340DirectAccessStorageFacilityReferenceManual_Aug77.pdf
Back to : GC21-5111-1_System3_Model | Home
SecondEdition (June1975)
Thisisamajorrevisionof,andobsoletes,GC2l-5111-0. xtensivechangeshavebeen E
m a d e t h r o u g h o u t a n d , t h e r e f o r e ,t h i s m a n u a l s h o u l d b e r e a d i n i t s e n t i r e t y . C h a n g e s r e a
p e r i o d i c a l l y m a d e t o t h e i n f o r m a t i o n h e r e i n ;b e f o r e u s i n g t h i s p u b l i c a t i o n i n c o n n e c t i o n
with the operation of IBM systems, refer to the latest l8M System/3 Bibliography,
G C 2 0 - 8 0 8 0 , f o r t h e e d i t i o n s t h a t a r e a p p l i c a b l ea n d c u r r e n t .
R e q u e s t sf o r c o p i e s o f I B M p u b l i c a t i o n ss h o u l d b e m a d e t o y o u r I B M r e p r e s e n t a t i v e r
o
t o t h e I B M b r a n c h o f f i c e s e r v i n gy o u r l o c a l i t y .
A R e a d e r ' sC o m m e n t f o r m i s p r o v i d e d a t t h e b a c k o f t h i s p u b l i c a t i o n . l f t h e f o r m h a s
b e e n r e m o v e d ,c o m m e n t s c a n b e a d d r e s s e d o I B M C o r p o r a t i o n , P u b l i c a t i o n s ,D e p a r t -
t
m e n t 2 4 5 , R o c h e s t e r ,M i n n e s o t a5 5 9 0 1 .
O C o p y r i g h t I n t e r n a t i o n a l B u s i n e s s a c h i n e sC o r p o r a t i o n , | 9 7 5
M
P a g e f G C 2 1 - 5 1 1- 1
o I
lssued 6 August1977
2
Bv TNL: GN21-5580
Preface
T h i s m a n u a lc o n t a i n s n t r o d u c t o r ym a t e r i a o n t h e I B M
i l IBM System/3 Model l5 Operator's Guide, GC21-5O75
3 3 4 0 D i r e c t A c c e s sS t o r a g eF a c i l i t y . l t i s i n t e n d e df o r u s e r s
o f t h e I B M S y s t e m / 3 M o d e l 1 5 ( S y s t e mC o n t r o l p i o g r a m IBM System/3 Model 75 System Control prograrnming
5 7 0 4 - S C 1 )w h o a r e i n t e r e s t e d n t h e p r o g r a m m i n ga s p e c t s
i Referenc Man ual. GC21-5O7
e 7
of the 3340.
IBM System/3 Overlay Linkage Eclitor Reference
T h i s m a n u a l i s o r g a n i z e di n t o f o u r c h a p t e r s . T h e f i r s t Manual. GC217561
c h a p t e r p r o v i d e sa g e n e r a l e s c r i p t i o no f t h e 3 3 4 0 a n d t h e
d
I B M 3 3 4 8 D a t a M o d u l e a n d o u t l i n e st h e s y s t e m IBM System/3 Model l5 System Generation Reference
r e q u i r e m e n t s .T h e s e c o n dc h a p t e rd e s c r i b e s y s t e ms u p p o r t Manual, GC21-7616
i n f o r m a t i o n a n d f u r n i s h e ss o m e p r o g r a m m i n gc o n s i d e r a t i o n s .
T h e t h i r d c h a p t e r i d e n t i f i e st h e s y s t e ms e r v i c e r o g r a m s .
p IBM System/3Model 75 System -5076
GC21
T h e f o u r t h c h a p t e r b r i e f l y d e s c r i b e sh e p r o g r a m p r o o u c t s
t
asthey apply to the 3340. Informationabout the 3340 IBM Systern/3 Model i5 System Control programming
d a t a m o d u l e f o r m a t , c a l c u l a t i n g i l e s i z e ,a n d 3 3 4 0
f Macros ReferenceManual, GC21-7608
o p e r a t i n gi n s t r u c t i o n si s i n c l u d e d i n t h e a p p e n d i x e s .
IBM System/3 Disk Conceptsand Planning Guide,
S p e c i fi c i n f o r m a t i o n c a n b e r e f e r r e dt o b y c o n s u l t i r r g h e
t GC21-7571
t a b l e o f c o n t e n t so r t h e i n d e x . C o d i n g i n f o r m a t i o n a n d
e x a m p l e sa r e n o t d i s c u s s e dn t h i s m a n u a l .
i IBM System/3 RPG ll ReferenceManual, SC21 7504
IBM System/3 SubsetAmerican National Standard
PrerequisiteKnowledge COBOL Reference Manual.SC28-6452
Y o u s h o u l d b e f a m i l i a r w i t h t h e r e l a t e dp u b l i c a t i o n s , a s i c
b l8M System/3FORTRAN lV Reference
Manual.
programming concepts, the operation of the componenrs sc28-6874
o f t h e S y s t e m / 3 M o d e l 1 5 , a n d t h e a p p l i c a t i o na n d i n f o r m a -
tion requirements f your organization.
o IBM System/3 BasicAssemblerReferenceManual.
sc21-7509
Related Publications IBM System/3 Disk Sort Refere'nce
Manual. SC21-7522
A d d i t i o n a l i n f o r m a t i o n a b o u t t h e 3 3 4 0 D i r e c t A c c e s sS t o r - IBM System/3 CommunicationsControl Program pro-
ageFacilitycan be found in the following publications: grammer's ReferenceManual, GC21 7579
IBM ReferenceManual for 3340 Disk Storage, IBM System/3 Model 15 CommunicationsControl Pro-
G426-1619 gram System ReferenceManual, GC21 7620
IBM 3348 Data Module Handling Procedures, IBM System/3 CommunicationsControl Program Ter-
GA26-1625 minal Operator'sGttide,GC21-7580
A d d i t i o n a il n f o r m a t i o n b o u tt h e M o d e l1 5 c a n b e f o u n d
a IBM System/3 Model l5 CommunicationsControl
i n t h ef o l l o w i n g u b l i c a t i o n s :
p Program System Operator's Guide, GC21-7619
. IBM Systemi3Model 15lntroduction, GC21-5094 . IBM System/3 A4odell5 lJsersGuide to Spooling,
GC21-7632
I c tSAl System/3 Models 8, 10, 12, and 15 Components
I Reference Manual,GA21 9236 For a completelist of System/3publications, IBM
see
System Bibl iography,GC20-8080.
/3
Page f GC21-511-1
o
l s s u e d 6 A u g u s t 19 7 7
2
By TNL: GN21-5580
Contents
C H A P T E R1 . I N T R O D U C T I O N 1-1 CHAPTER4. PROGRAM PRODUCTS +-l
System Requirements 1-1 R P GI I 4-1
3 3 4 0 D i s l 3340 Confiquration t-z F O R T R A NI V A '
Control 1 a
B a s i cA s s e m b l e r
Drive t-l DiskSort 4-1
Timing 1 a
A c c e s sM o t i o n T l m e
Rotational Delay
A P P E N D I XA . 3 3 4 8 D A T A M O D U L E S U R F A C E
Data Transfer 1 a
FORMAT A-1
C o r n p a r a t ; v e c c e s sT i m e s
A 1 ^
3340 DataModute
P h y s i c aC h a r a c t e r i s t i c s
l A P P E N D I XB . C A L C U L A T I N G F I L E S I Z E B-1
1-4
S t o r a g eC h a r a c t e r i s t i c s 1-4 DataAreaTrack Requirements b-l
U s eo f D a t a M o d u l e IndexAreaTrack Requirements
1-4 B-4
D a t aM o d u l e F o r r n a t T r a c k U s a g e o r I n d e x e d F r l e s.
f B-5
1,6
Core Index B-6
Calculating ileSizes - Sumrnary
F - o-o
C H A P T E R 2 , S Y S T E MS U P P O R T D e t e r r r r i n i ntg e N u m b e r o f T r a c k si n a
h
A c c e s sM e t h o d s S u p p o r t e d a 1 S e q u e n t i ao r D i r e c t F i l e
l D-O
Multivolume iles F D e t e r m i n i n g h e N u m b e r o { T r a c k si n a n
t
P r o c e s s i n L a r g eI n d e x e dD i s k F i l e s
gl I n d e x e dF i l e B-1
I n i t i a lP r o g r a m o a d ( l P L ) .
L D e t e r m i n i n g h e N u m b e r o f T r a c k so f D i s k
t
S p o o in g
l T r a c k In d e x 6-t
S y s t e m S e r v i c eP r o g r a m s 2-2 C o n v e r t i n gC y l i n d e r / T r a c k t o T r a c k N u m b e r B-7
P r o g r a mP r o d u c t s 2-2 C o n v e r t i n g r a c k N u m b e rt o C y l i n d e r / T r a c k
T B-l
C o m m u n i c a t i o n s o n t r D lp r o g r a m ( C C p )
C 2-2
A P P E N D I X C I O P E R A T I N G I N S T R U C T IO N S c-1
3340 Operator Panel c-1
ReadyIndicator u-l
START/STOP Switch
CHAPTER 3. SYSTEMSERVICEPROGRAMS J-I R e a dO n l y i n d i c a t o r
Cover Locked Indicator
Attention Pushbutton c-1
3340 Power Panel
3 3 4 0 M o c i e lA 2 c-1
Power On Pushbutton u-l
Power Off Pushbutton
D a t aM o d u l e L o a d i n g
D a t aM o d u l e U n l o a d i n g
R e a dO n l v F u n c t i o n U.J
E n a b l eR e a d O n l y F u n c t i o n c-3
D i s a b l eR e a d O n l y F u n c t i o n
A P P E N D I XD . C Y L I N D E R O F O R M A T D-1
A P P E N D I X E . t B M S Y S T E M / 3S T A N D A R D
CHARACTER SET E-1
GLOSSARY G-1
INDEX x-1
P a s eo f G C 2 1 - 5 1 1 - 1
1
l s s u e d5 D e c e m b e r 1 9 7 5
By TNL: GN21-5366
Chapter 1. Introduction
The IBM 3340 DirectAccess Storage Facilityoffers o 1 0 .1 2 m i l l i s e c o n d s e r a gre t a t i o n ad e l a y
o l
av
increased capacity
file and improvedperformance over
both the IBM 5444 and 5445 Disk Storage Drives.Two,
t h r e e , r f o u r 3 3 4 0d r i v e s a n b e o n l i n et o t h e I B M
o c
System/3 Model 15. The 3340 uses the IBM 3348 Data i 0 . 8 m i l l i s e c o n do r p l a n n i n g u r p o s e s
fs p
M o d u l e( M o d e l7 0 ) a sa s t o r a g e e d i u m .
m
o 885,000bytesper secondnominaldatatransferrate
SYSTEM EOUIREMENTS
R
Uniqueto the 3340, when compared the 5444 and 5445
to
disk storage
drives, the followingbasic
are features:
F o r i n f o r m a t i o n o n c e r n i ntg e m i n i m u ms y s t e m o n -
c h c
f iguration the 3340 DirectAccess
for Storage Facility o A data moduleinstead a disk pack
of
a n da d d i t i o n ad e v i c es u p p o r t e d ,e eo n e o f t h e f o l l o w i n g
l s
M o d e l1 5 p u b l i c a t i o n s :
o Defect kipping
s
. IBM System/3Model l5 lntroduction. GC21-5094
The data moduleis a sealed cartridge
that containsdisks,a
spindle, read/write heads, and access
arms. The useof the
. l8M System/3 Model l5 System Generation Reference
data moduleprovides followingadvantages the
the for
M a n u a lG C 2 1 - 7 6 1 6
.
S y s t e m / 3 o d e l1 5 :
M
D r i v e c a p a c i t y i s a p p r o x i m a t e l y5 1 m e g a b y t e s .
P r e v e n t i v e a i n t e n a n c e f t h e h e a d s , i s k s ,a n d s p i n d l e
m o d
i s e l i m i n a t e db y r e d u c i n gt h e e x p o s u r et o o u t s i d e c o n -
tamination.
R e l i a b i l i t y i s i m p r o v e d b y d e d i c a t e dr e a d / w r i t eh e a d s .
Each head readsonly the data it previously wrote.
Defect skipping allows data to be written before and after
a surface defect. Thus, all of the track can be used except
f o r t h a t p o r t i o n c o n t a i n i n gt h e d e f e c t . T h i s a l s o e l i m i n a t e s
3 3 4 0 D I S KS T O R A G E O N C E P T
C the access time that was formerly required to move the
read/write heads to an alternate track. Only one defect per
The 3340 provides directaccess storage the System/3
for h a l f - t r a c kc a n b e s k i p p e d i n t h i s m a n n e r ;f o r s e c o n da n d s u b -
M o d e l1 5 . T h e 3 3 4 0 i s a m o d u l a r h i g h - s p e eld ,r g e a p a c i t y
, a c sequent defects, an alternate track must be assigned.
storage facility for database/data communications general- or
purpose storage. Byte capacitiesremain at stated maximums even with known
defects. The user need not be concerned with managing
The 3340 drive uses 3348 DataModuleasthe storage defect skipping since the 3340 automatically handles access-
the
medium. The 3340 contains necessary
the mechanical ing of data on all subsequentread or write operations on
and
electrical load,provideair filtration that track.
components house,
to
for, and drivethe 3348 DataModule. Together, 3340 and
a
3348 have:
Lessthan 20 seconds
starttime
25 milliseconds
average
access
time
Introduction 1-1
The following3340 features, available System/370,
on o Positions access
the mechanism with voice-coil driveand
a r en o t a v a i l a b lo n S y s t e m / 3 :
e r v
m a i n t a i nts a c kf o l l o w i n g i a a n e l e c t r o n i s e r v o y s t e m
c s
o Remoteswitchattachment . Selects head
the
o Stringswitch . Reads writesdata
or
o Fixedheadfeature o Provides informationfor subsystem
safetyand servicing
and systemevaluation
o R o t a t i o n ap o s i t i o n e n s i n g
l s
TIMING
3 3 4 0C O N F I G U R A T I O N
The total access datatransfertime consists access
and of
T h e 3 3 4 0 c o n f i g u r a t i o n o r t h e M o d e l1 5 i n c l u d e o m b i n a -
fs c m o t i o n ,h e a ds e l e c t i o nn e g l i g i b l er)o t a t i o n ad e l a y . n d
( . l a
tions of the 3340 ModelsA2 (controland two drives),B1 datatransfer times.
( o n ed r i v e ) , n d 8 2 ( t w o d r i v e s )F i g u r e1 - 1 .
a ,
One ModelA2 is a prerequisite each3340 subsystem.
for The Motion Time
Access
desired numberof drivesis obtainedby attaching
one 3340
ModelB1 or one 3340 Model 82 to the 3340 ModelA2 Access motion time is the time required positionthe to
drive. Thusthe systemcan havetwo, three,or four drives access mechanism the specified
at cylinder. lf the access
attached. mechanism alreadyat the propercylinder,access
is motion
t i m e i s z e r o . l f t h e a c c e sm e c h a n i s m m o v e d t h e f o l l o w -
s is .
i n gt i m e sa r er e q u i r e d :
Control
Minimum - 10milliseconds
The control unit, part of the 3340 Model42, performsthe Average - 25 milliseconds
following unctions:
f Maximum - 50 milliseconds
o Interprets
and executes
macro-orders
from the storage
control R O T A T I O N A LD E L A Y
o Regulates storage
the control and disk storage
interfaces Rotational delayis the time required the desired for record
areato reachthe read/write headso that datatransfercan
o Checks integrityof data by error detectionand error
the begin. The average rotationaldelayfor a 3340 is 10.1 2
correctionanalysis milliseconds. However, due to the way the 3340 is support-
ed by System/3programming, average an rotationaldelay
o F u r n i s h es t a t u s o t h e s y s t e m
s t o f 1 0 . 8m i l l i s e c o n d s o u l db e u s e d o r p l a n n i n g u r p o s e s .
sh f p
o Performs evaluation the 3340 subsystem
diagnostic of
Data Transfer
Drive N o m i n a d a t at r a n s f e r a t e s o r t h e d i s k d r i v e s r e :
l f a
E a c h d r i v e otfh e 3 3 4 0 p e r f o r m s t h e f o l l o w i n g f u n c t i o n s : Bytespersecond - 885,000
ps r b y t e - 1 . 1 3
Microsecond e
o Responds commands
to from the 3340 ModelA2
(control)
o H o u s e s . a d s p r o v i d e a i r f i l t r a t i o nf o r , a n d d r i v e s h e
lo , s t
3340 data module
NFil[
I B M 3 3 4 0 M o d e lA 2 ( C o n t r oa n dT w o D r i v e s )
l
I B M 3 3 4 0 M o d e lB 1 ( O n eD r i v e )
FM
I B M 3 3 4 0 M o d e l8 2 ( T w o D r i v e s )
F i g u r e1 - 1 . 3 3 4 OC o n f i g u r a t i o n o d e l s
M
Introduction 1- 3
Comparative
Access
Times Storage
Characteristics
Figure1-2 illustrates access the timesfor the 5444 and 5445 Figure1-3shows the relative storage characteristics the of
d i s ks t o r a g d r i v e s n d t h e 3 3 4 0 .
e a 5444 andthe 5445 disk storage drivesand the 3340 for the
System/3Model15. The term recordis usedin this figureto
indicate physical
a recordor sectoron the disk. System/3
3340 DATA MODULE p r o g r a m m i ns u p p o r t so g i c ar e c o r d sh a t s p a np h y s i c a l
g l l t
records.
O n t h e S y s t e m / 3 o d e l1 5 ,t h e 3 3 4 0d r i v e s s et h e I B M
M u
3 3 4 8 M o d e l7 0 D a t aM o d u l e .D u et o t h e f o r m a t t i n g e -
r
g u i r e db y S y s t e m / 3t.h e c a p a c i t y f a d a t am o d u l ei s 5 1
o Useof the DataModule
m e g a b y t e s .h i sc h a p t e d e s c r i b e s e M o d e l7 0 d a t am o d -
T r th
u l e s su s e d y S y s t e m / 3 T h e f o r m a to f t h e d a t am o d u l ei s
a b . E a c h3 3 4 0d a t am o d u l ei s d i v i d e d n t o a r n a i n a t aa r e a
i d
d e s c r i b eid A p p e n d i x .
n A a n d f o u r s i m u l a t i o n r e a s .F o l l o w i n gs a g r a p h i c e p r e -
a i r
sentation theseareas a 3340 subsvstem:
of of
Physical haracteristics
C
Four 5444
S i m u l a t i oA r e a s
n
Drive Main Data Area --^-\
1
D1 T I R1
D2 F 2 R2
D3
i
D4
T w e l v eS i m u l a t i o n
B a c k u pA r e a s
Main Data Area
T h e r n a i n d a t a a r e ao f e a c h m o d u l e p r , : v i d e s 0 . 8 m e g a -
4
b y t e s o f d a t a s t o r a g e . T h e s ea r e a sa r e r e f e r r e dt o a s f o l l o w s :
D1 = M a i n d a t a a r e ao n 3 3 4 0 e l r i v e1
Height- 8 inci-irs D2 = M a i n d a t a a r e ao n 3 3 4 0 d r i v e 2
Width -- 16 incl'r,-r: D3 = M a i n d a t a a r e ao n 3 3 4 0 d r i v e 3
M a x i m u n ri e n g t h- 1 8 i n c h e s D4 = M a i n d a t a a r e ac l n 3 3 4 0 d r i v e 4
S h i p p i n gw e i g h t ' 2 3 p o u n d s
5444
(HighSpeed) 5445 3340
M i n i m u ma c c e stsm e
i 28 ms 25 ms 1 0m s
Average
access
time i26 ms 60 ms 25 ms
M a x i m u m c c e stsm e
a i 255 ms 1 3 0m s 50 ms
Datatransferrate 199,000bytes/sec 3 1 2 , 0 0 0 y t e s / s e c 885,000bytes/sec
b
R o t a t i o n as p e e d
l 1500 rpm 2400 rpm 2 9 0 0r p m ( a p p r o x . )
Nominal otation ime
r t 40 ms 25 ms 2 O . 2m s
Average
rotationaldelay 20 ms 1 2 . 5m s 10.1 s
m
Figure 1-2. Access Times for the 5444 and 5445 Disk Storage Drives and the 3340
5444 5445 3340t
Bytes per record 256 256 256
Records per track 24 20 48
Bytes per track 6,144 5,120 12,288
Tracksper cylinder 2 20 20
Bytesper cylinder 12,288 102,400 245,760
C y l i n d e r sp e r d i s k p a c k / d a t am o d u l e 2 1001200 200 207
Bytes per disk pack/data module2 1,228,800t 20,480,000 50,872,320
2,457,600
T r a c k s p e r d i s k p a c k / d a t am o d u l e 2 2001400 4,000 4,14Q
R e c o r d sp e r d i s k p a c k / d a t am o d u l e 2 4,800/9,600 80,000 198,720
M a x i m u m n u m b e r o f d i s k f i l e sp e r p a c k / m o d u l e 50 i,000 1,000
M a x i m u m n u m b e r o f u s a b l ed i s k s u r f a c e s d 80 z.+
Maximum number of drives 23 4 4
1 See 3348 Data Module Surface Format in Apoendix A
2 E x c l u d i n ga l t e r n a t e r a c k sa n d C E t r a c k s .
t
3 The 5444 containstwo packsper drive.
F i g u r e 1 - 3 . C h a r a c t e r i s t i c s f D i s k S t o r a g e D r i v e sf o r t h e S y s t e m / 3 M o d e l 1 5
o
Introduction 1- 5
Page f GC21-51 1-1
o 1
l s s u e d5 D e c e m b e r ' 1 9 7 5
By TNL: GN21-5366
Simulation Areas DataModuleFormat
Each3340 data moduleusedon System/3 contains four F o r u s ew i t h t h e S y s t e m / 3 o d e l1 5 ,a 3 3 4 0d a t am o d u l e
M
5 4 4 4s i m u l a t i o n n d s i m u l a t i o n a c k u p r e a s . h e s y s t e m
a b a T h a st h e f o l l o w i n g o r m a t :
f
uses 5444 simulation
the areas the same
in way it would use
the 5444 disk storage drive. That is, all libraries (userpro_ Number Millions
grams, systemprograms, procedures, arecontained
etc) in Cylinder of Tracks of Bytes Description
t h e 5 4 4 4s i m u l a t i o n r e a s .
a
o 20 0.25 Reserved systemfor
T h e r ea r ef o u r 5 4 4 4s i m u l a t i o n n d s i m u l a t i o n a c k u p r e a s
a b a use
f o r e a c h r i v e( a t o t a l o f 1 6 f o r a l l f o u r d r i v e s ) .F o u ro f
d 1-166 3,320 40.80 M a i nd a t aa r e a
t h e s e1 6 a r e a s r ea v a i l a b lfe r g e n e r a l y s t e m s e :
a o s u 167-168 40 0.49 Alternatetracks
169-208 800 9.83 Simulation reas a
F1 S i m u l a t i o no f fixed disk on 5444 drive j 209 8 0.'10 E r r o rs t a t i s t i ca n d
s
R1 Simulation of removabledisk on 5444 drive 1
CE tracks
F2 S i m u l a t i o no f fixed disk on 5444 drive 2 4,188 5 1. 4 7 Total
R2 S i m u l a t i o no f r e m o v a b l e i s k o n 5 4 4 4 d r i v e2
d
. The locationof thesefour 5444simulation areas f ixed.
is T h e o n l i n e c a p a c i t y( F i g u r e1 - 4 ) d e p e n d s n t h e n u m b e ro f
o
F1 and Rl arealways 3340 drive 1; F2 and R2 are
on d r i v e sa v a i l a b l e o t h e p r o g r a m ( a m i n i m u m o f t w o d r i v e s
t
I
always 3340 drive2. The usercan prevent(viaan
on i s a t t a c h e dt o t h e M o d e l 1 5 ) .
o p e r a t o c o n t r o lc o m m a n dt)h e s i m u l a t i o n f F 2 a n d R 2 ,
r o
s o t h a t o f f l i n em u l t i v o l u m ei l e sc a n b e p r o c e s s e d D 2 .
f on The 5444 simulation areasare accessible SCp (system by
c o n t r o l p r o g r a m )a n d p r o g r a m p r o d u c t s ;t h e s i m u l a t i o n
T h e r e m a i n i n g 2 s i m u l a t i o n a c k u p r e a s r ea c c e s s i b l e
1 b a a b a c k u p a r e a sa r e a c c e s s i b l o n l y b y t h e 3 3 4 0 s i m u l a t i o n
e
o n l y b y t h e 3 3 4 0s i m u l a t i o n r e ap r o g r a m $ S C O p y ) .
a ( a r e ap r o g r a m ( $ S C O P Y ) .
fhe 5444 simulation areas related a drive ratherthan
are to
t o a d a t am o d u l e .T h e m o d u l em o u n t e d n d r i v e1 c o n t a i n s
o
t h e F 1 a n d R 1 a r e a sa n d t h e m o d u l em o u n t e d n d r i v e2
, o
c o n t a i n sh e F 2 a n d R 2 a r e a s .l f t h e d a t am o d u l en o r m a l l y
t
p l a c e d n d r i v e2 i s p l a c e d n d r i v e1 , t h e a r e a s n d r i v e1
o o o
would be accessed F1 and R1 ratherthan as F2 and R2.
as
Number of Bytes
S i m u l a t i o nA r e a s
Number 5 4 4 4S i m u l a - Simulation Other Use
of Drives Main Data Area tion Areas Backup Areas ( R e s e r v e d ) Total
I 40,796,160 4,915,200 4,915,200 835,584 s',t,462,144
2 81,592,320 9,830.400 9,830,400 1, 6 7 1 1 6 8
, 102,924,288
122,388,480 9.830,400 19,660,800 2,506,752 't54,386,432
4 163.184.640 9,830,400 29,491.200 3,342,336 205,848,576
Figure 14. Online Capacityof 3340 Drives
Page f GC21-5111,1
o
lssued 6 August1977
2
ByTNL: cN21,5580
Chapter 2" SystemSupport
F r o m a p r o g r a m m i n gs t a n d p o i n t ,t h e m a i n d a t a a r e ao f t h e File Organrzation
3 3 4 0 i s s u p p o r t e di n t h e s a m ew a y a s f o r t h e 5 4 4 5 , a n d t h e
AccessMethods Sequential Indexed Direct
5 4 4 4 s i m u l a t i o na r e a sa r e s u p p o r t e di n t h e s a m ew a v a s f o r
t h e 5 4 4 4 . H i g h l i g h t so f t h e p r o g r a ms u p p o r t f o r t h e m a i n
L o a d ( o u t p i r t) X X X
d a i a a r e : a r e c l i s c u s s eid t h i s c h a p t e ra l o n g w i t h t h e c o n -
a n
s i d e r a t i o n s o r u s i n g t h e 5 4 4 4 s i m u l a t i o na r e a s .
f
In p u t
Consecutive X X
R a n d o mb y k e y X
A C C E S SM E T H O D S S U P P O R T E D
R a n d o m b y r e l a t i v er e c o r d
F o r t h e m a i n d a t a a r e a ,s e q u e f r t i a li,n d e x e d ,a n c jd i r e c t f i l e
number X x
organizationsare supported in the same .vliaV for the
S e q u e n t i a lb y k e y X
as
5445.
_il',*',illil'_
Add
F o r t h e 5 4 4 4 s i m u l a t i o na r e a s s e q u e n t i a l i, n d e x e d ,a n d
,
d i r e c t f i l e o r g a n i z a t i o n s r e s u p p o r t e di n t h e s a m ew a v a s
C o ns e c u tv e
i X
a
F a n d o mb y k e y
f o r t h e 5 4 4 4 , e x c e p t t h a t i n d e x e df i l e s c a n n o t b e p r o c e s s e d
S e q u e n t i ab y k e v
l
u s i n gt h e i n d e x ( t h e r ei s n o s u p p o r t f o r p r o c e s s i n gh e i n d e x ) .
t
A s a c o n v e r s i o n i d , a n i n d e x e df i t e i n t h e 5 4 4 4 s i m u l a t i o n
a
Update
a r e ac a n b e c o p i e d t o t h e m a i r rd a t a a r e au s r n gt h e c o p y /
C o n s e c uitv e X
d u m p p r o g r a m ,t h e r e b y c r e a t i n ga n i n d e x e df i l e i n t h e m a i n
Randomby key
data area.
R a n d o r nb y r e l a t r v e e c o r d
r
n um b e r
F i l e s i n t h e m a l n d a t a a r e ac a n b e s i n g l ev o l u r n eo r n i u l t i -
Sequential'bket' y
v o l u n r ef i l e s ; f i l e s i n t h e 5 4 4 4 s i m u l a t i o r - rr e ac a n b e s i n g l e
a
S e q u e n t i ab y l i m i t s
l
v o l u r n eo n l y , o r m u l t i v o l u m e f i l e s p r o c e s s e d s s i n g l e
a
volumes.
Figure 2-1. File Organization and Access Methods Supported f or the
3340 Main Data Area
F i g u r e 2 - 1 s h o w st h e f i l e o r g a n i z a t i o n s n d t h e a c c e s s
a
m e t h o d s s u p p o r t e df o r t h e 3 3 4 0 m a i n d a t a a r e a , The following restrictions pply to offline multivolume
a
files:
D 1 c a n n o t b e u s e df o r o f f l i n e m u l t i v o l u m e f i l e s b e c a u s e
MULTIVOLUMEFILES
i t c o n t a i n s h e I P L ( i n i t i a lp r o g r a ml o a d )s y s t e m ; t h e r e -
t
tore, it must be mounted at all times.
A f i l e t h a t e x c e e d s h e c a p a c i t yo f o n e d a t a m o d u l e c a n b e
t
c o n t i n u e d o n o n e o r m o r e s u b s e q u e nd a t a m o d u l e s . S u c h
t
l j a l l v o l u m e sa r e n o t m o u n t e d o n t h e s a m ed r i v e , t h e y
f i l e sa r e k n o w n a s m u l t i v o l u m e i l e s . A m u l t i v o l u m e i l e
f f
c a n b e m o u n t e d i n a s e q u e n c e s s p e c i f i e db y t h e
a
c a n b e o n l i n eo r o f f l i n e . O n l i n e m e a n s h a t a l l t h e v o l u m e s
t
( d a t a m o d u l e s )c o n t a i n i n gt h e f i l e a r e r u n n r n go n d r i v e s l/FILE OCL statement,
d u r i n g p r o c e s s i n g o t h a t a i l t h e r e c o r d sa r e a v a i l a b l e o r
s f
D 2 c a n n o t b e u s e df o r o