| 0(X'00') |
Character |
1 |
DS4IDFMT |
Format identifier (X'F4'). |
| |
|
|
DS4IDC |
Constant value of X'F4' in DS4FMT. |
| 1(X'01') |
Character |
5 |
DS4HPCHR |
Highest address (CCHHR) of a format-1 DSCB. |
| 6(X'06') |
Unsigned |
2 |
DS4DSREC |
Number of available DSCBs. |
| 8(X'08') |
Character |
4 |
DS4HCCHH |
CCHH of next available alternate track. |
| 12(X'0C') |
Unsigned |
2 |
DS4NOATK |
Number of remaining alternate tracks. |
| 14(X'0E') |
Bitstring |
1 |
DS4VTOCI |
VTOC indicators. |
| |
1 . . . . . . . |
|
DS4DOSBT |
VSE bit. Either invalid format 5 DSCBs or indexed VTOC. Previously
DOS(VSE) bit. See DS4IVTOC. |
| |
. 1 . . . . . . |
|
DS4DVTOC |
Index was disabled. |
| |
. . 1 . . . . . |
|
DS4EFVLD |
Extended free-space management flag. When DS4EFVLD is on, the
volume is in OSVTOC format with valid free space information in the
format-7 DSCBs. See also DS4EFLVL and DS4EFPTR. |
| |
. . . 1 . . . . |
|
DS4DSTKP |
VSE stacked pack. |
| |
. . . . 1 . . . |
|
DS4DOCVT |
VSE converted VTOC. |
| |
. . . . . 1 . . |
|
DS4DIRF |
DIRF bit. A VTOC change is incomplete. |
| |
. . . . . . 1 . |
|
DS4DICVT |
DIRF reclaimed. |
| |
. . . . . . . 1 |
|
DS4IVTOC |
Volume uses an indexed VTOC. |
| 15(X'0F') |
Unsigned |
1 |
DS4NOEXT |
Number of extents in the VTOC(X'01'). |
| 16(X'10') |
Bitstring |
1 |
DS4SMSFG |
System managed storage indicators. |
| |
00 . . . . . . |
|
DS4NTSMS |
Non-system managed volume. |
| |
01 . . . . . . |
|
DS4SMSCV |
System managed volume in initial status. |
| |
10 . . . . . . |
|
|
Reserved. |
| |
11 . . . . . . |
|
DS4SMS |
System managed volume. |
| |
11 . . . . . . |
|
DS4SMSTS |
System managed volume. |
| |
. . xx xxxx |
|
|
Reserved. |
| 17(X'11') |
Binary |
1 |
DS4DEVAC |
Number of alternate cylinders when the volume was formatted.
Subtract from first 2 bytes of DS4DEVSZ to get number of useable
cylinders (can be 0). Valid only if DS4DEVAV is on. |
| 18(X'12') |
Character |
14 |
DS4DEVCT |
Device constants. For currently supported devices, these fields
do not provide enough information to calculate the amount of space
used on a track. Use TRKCALC (see Performing Track Calculations (TRKCALC macro)). |
| 18(X'12') |
Character |
4 |
DS4DEVSZ |
Device size. |
| 18(X'12') |
Binary |
2 |
DS4DSCYL |
Number of logical cylinders including alternates, if any exist.
Unsigned number. Set to X'FFFE' for devices with more than
65,520 cylinders, indicating that cylinder-managed
space exists (DS4CYLMG is set on) and extended attribute DSCBs, formats
8 and 9, are allowed. |
| 20(X'14') |
Binary |
2 |
DS4DSTRK |
Number of tracks in a logical cylinder. |
| 22(X'16') |
Unsigned |
2 |
DS4DEVTK |
Device track length. |
| 24(X'18') |
Binary |
2 |
DS4DEVOV |
Keyed record overhead. |
| 24(X'18') |
Binary |
1 |
DS4DEVI |
Non-last-keyed record overhead. |
| 25(X'19') |
Binary |
1 |
DS4DEVL |
Last keyed record overhead. |
| 26(X'1A') |
Binary |
1 |
DS4DEVK |
Non-keyed record overhead differential. |
| 27(X'1B') |
Bitstring |
1 |
DS4DEVFG |
Flag byte 1. |
| |
. . . 1 . . . . |
|
DS4DEVAV |
Value in DS4DEVAC, number of alternate cylinders is valid.
Otherwise, the number is not available in this DSCB. |
| |
. . . . 1 . . . |
|
|
Keyed record overhead field (DS4DEVOV) is used as a 2-byte
field to specify the overhead required for a keyed record. |
| |
. . . . . 1 . . |
|
|
The CCHH of an absolute address is used as a continuous binary
value. Not implemented in the current IBM® product line. |
| |
. . . . . . 1 . |
|
|
The CCHH of an absolute address is used as four separate binary
values. Not implemented in the current IBM product line. |
| |
. . . . . . . 1 |
|
|
A tolerance factor must be applied to all but the last block
of the track. Not implemented in the current IBM product line. |
| |
xxx. . . . . |
|
|
Reserved. |
| 28(X'1C') |
Binary |
2 |
DS4DEVTL |
Device tolerance. |
| 30(X'1E') |
Binary |
1 |
DS4DEVDT |
Number of DSCBs per track. |
| 31(X'1F') |
Binary |
1 |
DS4DEVDB |
Number of PDS directory blocks per track. |
| 32(X'20') |
Binary |
8 |
DS4AMTIM |
VSAM time stamp. |
| 40(X'28') |
Character |
3 |
DS4AMCAT |
VSAM catalog indicator. |
| 40(X'28') |
Bitstring |
1 |
DS4VSIND |
VSAM indicators. |
| |
1 . . . . . . . |
|
DS4VSREF |
A VSAM catalog references this volume. |
| |
. 1 . . . . . . |
|
DS4VSBAD |
The VSAM data sets on this volume are unusable because an MSS
CONVERTV command has not completed successfully for the volume. (No
longer set.) |
| |
. .1 . . . . . |
|
DS4VVDSA |
Bit on indicate VVDS does exist |
| |
. .1 . . . . . |
|
DS4VVDSR |
If on, VVDS data set name was scanned. It
is turned on once per volume when the VVDS was scanned on the volume. |
| |
. . .x xxxx |
|
|
Reserved. |
| 41(X'29') |
Unsigned |
2 |
DS4VSCRA |
Relative track location of the CRA. |
| 43(X'2B') |
Binary |
8 |
DS4R2TIM |
VSAM volume/catalog match time stamp. |
| 51(X'33') |
Character |
5 |
|
Reserved. |
| 56(X'38') |
Character |
5 |
DS4F6PTR |
Pointer (CCHHR) to first format-6 DSCB, or zero. (No longer
supported as non-zero). |
| 61(X'3D') |
Character |
10 |
DS4VTOCE |
VTOC extent description. |
| 71(X'47') |
Character |
10 |
Reserved. |
VTOC extent description. |
| 81(X'51') |
Character |
1 |
DS4EFLVL |
Extended free-space management level. X'00' indicates
extended free-space management is not used for this volume. X'07' indicates
extended free-space management is in use for this volume (see also
DS4EFVLD). |
| 82(X'52') |
Character |
5 |
DS4EFPTR |
Pointer to extended free-space information. If DS4EFLVL=X'00' this
is zero. If DS4EFLVL=X'07' this is the CCHHR of the first
FMT-7 DSCB and no format-5 DSCBs contain free space information. |
| 87(X'57') |
Character |
1 |
DS4MCU |
Minimum allocation size in cylinders for cylinder-managed space.
Each extent in this space must be a multiple of this value. |
| 88(X'58') |
Character |
4 |
DS4DCYL |
Number of logical cylinders. Valid when DS4DSCYL= X'FFFE'. |
| 92(X'5C') |
Character |
2 |
DS4LCYL |
First cylinder address/4095 where space is managed in multicylinder
units. Cylinder-managed space begins at this address. Valid when DS4CYLMG
is set. |
| 94(X'5E') |
Character |
1 |
DS4DEVF2 |
Device Flags Byte 2 |
| |
1... .... |
|
DS4CYLMG |
Cylinder-managed space exists on this volume and begins at
DS4LCYL in multicylinder units of DS4MCU. DS4EADSCB is also set when
this flag is on. |
| |
.1.. .... |
|
DS4EADSCB |
Extended attribute DSCBs, Format 8 and 9 DSCBs, are allowed
on this volume. |
| |
|
..xx xxxx |
|
Reserved |
| 95(X'5F') |
|
1 |
|
Reserved |
| 96(X'60') |
|
|
DS4END |
- |
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Copyright IBM Corporation 1990, 2014