RESERVED 2 bytes

-S.TANDARD DASD FILE lABEL, FORfvlAT 4 ( .... Cont'd) FIELD NAME AND LENGTH DESCRIPTION SA NUMBER OF EXTENTS

1 byte

Contains the hexadecimal constant 01, to indicate one extent in the VTDe.

88 RESERVED 2 bytes DEVICE CONSTANTS 14 bytes

Reserved.

This field contains constants describing the device on which the volume was mounted when the VTDe was created. The following describes each of the subfields:

Device Size: (4 bytesl-The number of cylinders (CC) and tracks per cylin.

der (HH).

Track Length: (2 bytes)-The number of available bytes on a track exclusive of home address and record zero. (Record zero is assumed to be a nonkeyed record with an eight bytes data field.) Record Overhead: (3 bytesl-The number of bytes required for gaps, chec~ bits.

and count field for each record. This value varies according to the record characteristics and thus is broken down into three subfields.

I: Overhead required for a keyed record other than the last record on the track.

L: Overhead required for a keyed record that is the last record on the track.

K: Overhead bytes to be subtracted from I or L if the record does not have a key field.

Flag:

Bits:

Tolerance:

Labelsltrack:

Directory Blocksl Track

'---

'---(1 byte)-Further defines unique characteristics of the device.

0-5: Do not apply to the 2311, 2314, 2319, 3330. or 3340.

4: ON indicates that I and L values share a 2 byte field for the 3350.

7: ON indicates that a tolerance factor must be applied to each record except the last on each track.

(2 bytes)-A value that is to be used to determine the effec-tive length of the record on the track_ This factor is used if bit 7 of the F lag byte is on_

(1 byte)-A count of the number of labels that can be written on each track in the VTOC. (Number of full records of 44-bytes key and 96-44-bytes data length that can be contained on one track of this device.)

(1 byte)-A count of the number of directory blocks that can be written on each track for an OS/VS partitioned data set.

(Number of full records of B-bytes key and 256·bytes data length that can be contained on one track of this device.)

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STANDARD DASD FILE LABEL, FORMAT 4 ( ..• Cont'd)

FIELD NAME AND LENGTH DESCRIPTION FIELD NAME AND LENGTH DESCRIPTION

DEVICE CONSTANTS The following illustrates the device constants VSAM TIMESTAMP Is the time the most recent VSAM data (. ,Cant'd) field for the various direct access devices: 8 bytes space was added to the volume.

Device

"" ^t<t!

^Track

^{.I. !o}

^{!> ~}

^I£!:

^Labels VSAM CATALOG Bit 0 '" ON: This volume is owned by a

~ ^Track 1 byte VSAM catalog.

2311 203 10 3625 81 20 20 537 16 Bit 1-7: Unused

2314/2319 203 20 7294 146 45 45 534 25 TT OF eRA Relative track number of first track of

cata-3330 411 19 13165 191 191 56 512 39 2 bytes log recaveryarea.

3330·11 815 19 13165 191 191 56 512 39 VSAM TIMESTAMP

3340/35MB 350 12 8535 242 242 75 512 22 8 bytes

3340170MB 700 12 8535 242 242 75 512 22 108 CATALOG RECOVERY The physical block number pointer of the

i

3350 555 30 19254 267 267 82 512 46 AREA POINTER catalog recovery area for this volume.

4 bytes

ll.

Note: Labels per track =

~r!~~~:~~:~9th

^11-14 VTOC EXTENT These fields describe the extent of the

i1'

10 bytes VTOC and are identical in format to fields

[

1J

^lOA VSAM INDICATORS The VSAM indicators are present on any 21-24 of the Format 1 file-label. Extent

19 bytes volume that contains space allocated to type 01 (prime data areaL

..,

^I

VSAM. If a volume does not contain any

15 RESERVED Reserved

~

VSAM·owned space, these fields are set to

25 bytes

~ 9,

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~ Field

Label ID

'~-jLabel Number jACCeSSibility Indicator

2 13 Volume

14 1

⁵

Serial Reserved

Number

31415 10111112 37138

FIELD NAME AND LENGTH LABEL IDENTIFIER 3 bytes

DESCRIPTION Contents VOL.

VOLUME LABEL NO.

1 byte

VOLUME SERIAL NO.

B bytes ACCESSIBILITY INDICATOR 1 byte'

Contents '1'.

Id!!ntification for a volume usually a number, but may also be alphanumeric.

Blank or S. Indicates that additional qualifi·

cation is needed.

OWNER IDENTIFICATION Name or a code. Specifies the owner of the

14 bytes volume.

LABEL STANDARD Must contain W.

LEVEL 1 byte

'~ ' ' ' - - '

Label Standard Levell

Owner Identification Reserved

51152 79180

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Field Label Numbe Ind· Mul· Verify Ind·

2 3 4 7 8 9 10 11 12 13 14 15 1617 18 19 20 21 2223 24

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Label File Record Begin Eod Creation Expiration End of Date

,. "

ID ID Length Extent Extent Date Date Address

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3 4 5 6 1314 2223 272829 33 34 35 3940 41 42 4344 451464 48 5354 6667 72 73 7475 7980 0;

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I nterchange Level

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FIELD NAME AND LENGTH DESCRIPTION FIELD NAME AN 0 LENGTH DESCRIPTION

"

LABEL 10 Must contain 'HDR'. 15 INTERCHANGE LEVEL Identifies: Physical Record Length

3 bytes 1 byte Record Length· Fixed

LABEL NUMBER Must contain ','. Record Attributes

1 byte File Organization.

Blank or 'E'.

FILE 10 Identification name, alphameric.

16 MULTIVOLUME Indicates: Blank'" File complete

:j ^{8 bytes} INDICATOR C'" File continued on another

RECORD LENGTH Length ob the data records. Decimal right·justified. 1 byte volume

5 bytes L'" File complete.

EXTENT BEGIN Begin of Extent area, Decimal in form CCHHR. 17 VOLUME SEQUENCE Number of Volumes in a multivolume file. Decimal

~ ^{[ [}

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3.

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5 bytes NUMBER digits.

10 EXTENT END End of extent area. Decimal in form CCHHR. 2 bytes

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5 bytes 1B CREATION DATE Date the file was created, form = YYMMDD decimal.

12 BYPASS INDICATOR Indicates whether or not a file is interchanged. Blank 6 bytes

1 byte or'S', 20 EXPIRATION DATE Date this file may be purged, form'" YYMMDD

13 FILE SECURITY Indicates whether or not additional qualifications 6 bytes decimal.

1 byte must be SUpplied. Blank or'S'. 21 VERIFY INDICATOR Indicates whether or not data has been subjected to

14 WRITE PROTECT Indicates whether or not a file may be overwritten. 1 byte verification. Blank or 'V'.

1 byte Blank or 'P'. 23 END OF DATA ADDRESS Address of next higher unused record,

S bytes form '" CCHHR decimal.

Fields 3, 5, 7, 9, 11, 19, 22 and 24 are reserved.

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Licensed Material - Property of IBM DATA MANAGEMENT AND SYSTEM CONTROL MACROS

Declarative Macros

Name Operation Operands Description

Iname] CDMOD I.CRDERR:RETRY] card reader file I,CTLCH R= (ASAI YES})

I.DEVICE"'nnnn]

I,FUNC= (RIPIII RPI RWI RPWIPwlJ

1,IOAREA2=YES) •

Defines attributes common to a group of line types

(IOAREA2=YES] Defines a logic module for a

(.RDONLY=YES] device-independent file

I,RPS=SVA(

I.SEPASMB=YES) (,TRC=YES(

I,TYPEFLE=(OUTPUTIINPUT })

LFR-nn.LlNBEG-nn Describes line types. fields in 1.IMAGE={~IYES}1 the line

[.NOSCAN=(n.nl) I. FLDn=(n.n.NC A IT.xxxl) I.EDITn=(xxxxxx.E DCHARj I

I,F R EN D=!!!QI YES})

IDEVICE-3886] Defines logic modules fora

I.RDONLY=YES) 3886 file

[.SEPASMB=YES]

I.SETDEV=YESj

DEVADDR=SYSxxx Defines a card or 3881 file .IOAREA l=xxxxxxxx

I. EOFAD DR=xxxxxxxx I I.ERROPT=xxxxxx1

Dans le document VSE/ Advanced Functions Handbook (Page 123-127)