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Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure RDCBK Real Device Characteristics Block
The first 64 bytes contain the architected RDC info.
0000 0 Bitstring 64 RDCDATA (0) RDC 64 BYTES RETURNED
0000 0 Bitstring 2 RDCCUID CONTROL UNIT IDENTIFIER
0002 2 Bitstring 1 RDCCUMN CONTROL UNIT MODEL
0003 3 Bitstring 2 RDCDVID DEVICE IDENTIFIER (= Device TYPE)
0005 5 Bitstring 1 RDCDVMN DEVICE MODEL
0006 6 Bitstring 4 RDCFEAT (0) Device and storage control
0006 6 Bitstring 2 * Device and stg control bytes 0-1
0008 8 Bitstring 1 RDCEXFC Extended Function Capacity
.1.. .... RDCXRC X'40' RDCXRC Device supports XRC
..1. .... RDCPPRC X'20' RDCPPRC Device Support PPRC
CCWs
0009 9 Bitstring 1 RDCFEAT3 Device and stg control byte 3
.1.. .... RDCMPLF X'40' RDCMPLF Device is attached
to a control unit which supports
MPLF
..1. .... RDCRCACH X'20' RDCRCACH Device is attached
to a control unit which supports
record cache facilities.
000A 10 Bitstring 2 RDCOSCOD (0) OS DEVICE CODES
000A 10 Bitstring 1 RDCOSCLS OS DEVICE CLASS CODE
000B 11 Bitstring 1 RDCOSTYP OS DEVICE TYPE CODE
000C 12 Bitstring 28 RDCDEVF1 DEVICE SPECIFIC FIELD 1
0028 40 Bitstring 1 RDCMDRID MDR IDENTIFIER
0029 41 Bitstring 1 RDCOBRID OBR IDENTIFIER
002A 42 Bitstring 22 RDCDEVF2 DEVICE SPECIFIC FIELD 2
00000040 RDCDALEN (*-RDCDATA) LENGTH OF RDC DATA
RETURNED
Static device information
0040 64 Address 4 RDCNEXT ADDR OF NEXT RDCBK IN CHAIN
0044 68 Character 4 RDCDCHAR Device ID in EBCDIC.
0048 72 Bitstring 1 RDCFLGS (0) DEVICE STATUS FLAG
0048 72 Bitstring 1 RDCSTATS DEVICE RDC STATUS
1... .... RDCSUPT X'80' RDCSUPT DEVICE SUPPORTS RDC
CCW
.1.. .... RDCNCRNT X'40' RDCNCRNT RDCBK IS NOT
CURRENT FOR DEVICE
..1. .... RDCOFFSP X'20' RDCOFFSP ERP should be done
for this ... device when it is
offline.
...1 .... RDCFBA X'10' RDCFBA RDCBK is for an FBA
DASD
.... ...1 RDCSSUPT X'01' RDCSSUPT DEVICE SHOULD
SUPPORT RDC CCW
0049 73 Bitstring 1 RDCCUFT Control unit features flag
1... .... RDCCASS X'80' RDCCASS Device is attached
to a caching control unit.
.1.. .... RDCSICS X'40' RDCSICS Device is attached
to a control unit which supports
special intercept condition.
..1. .... RDCNOSR X'20' RDCNOSR Device is attached
to a control unit which does not
support suspend/resume
...1 .... RDCASYNC X'10' RDCASYNC Device is attached
to a control unit which supports
asynchronous processing.
.... 1... RDCRSTNT X'08' RDCRSTNT Device is attached
to a control unit which supports
reset notification processing.
.... .1.. RDCCUIBK X'04' RDCCUIBK Device is attached
to a control unit which is
described by a CUIBK
.... ..1. RDCFLASH X'02' RDCFLASH Device supports
FLASHCOPY VM/XA INTERNAL DEVICE
TYPE CODES
004A 74 Bitstring 1 RDCDVCLS VM/XA DEVICE CLASS CODE
004B 75 Bitstring 1 RDCDVTYP VM/XA DEVICE TYPE CODE
004C 76 Bitstring 1 RDCDVFTR VM/XA DEVICE FEATURE CODE
Additional Initialization
Verification Fields
004D 77 Bitstring 1 RDCRDMN USER DEFINED DEVICE MODEL NUMBER
004E 78 Bitstring 1 RDCRC Invalid I/O configuration id.
004F 79 Bitstring 1 RDCDVSCL VM/ESA device subclass code CP
SYSTEM SERVICES AREA
0050 80 Address 4 RDCERPA ERROR RECOVERY PROCEDURE ADDRESS
0054 84 Address 4 RDCERSA ERROR RECOVERY SPECIFIC ADDRESS
0058 88 Address 4 RDCCRSA CHANNEL ERROR RECOVERY SPEC. ADDR
005C 92 Address 4 RDCCPTA CHANNEL PROGRAM TABLE ADDRESS
0060 96 Address 4 RDCCMTBA DEVICE MANAGEMENT COMMAND TABLE @
0064 100 Address 4 RDCLERPA LIMITED ERROR RECOVERY PROC ADDR
0068 104 Address 4 RDCLERSA LIMITED ERROR RECOVERY SPEC ADDR
006C 108 Address 4 RDCSQUY SENSE DATA QUERY ROUTINE ADDR
0070 112 Address 4 RDCHERSA HPF error recovery specific addr
0074 116 Signed 4 * Reserved for IBM use
Device Specific Area
0078 120 Bitstring 80 RDCDSPEC Device specific area
000000C8 RDCLEN (*-RDCBK) LENGTH OF THE RDCBK IN
BYTES
00000019 RDCSIZE (*-RDCBK+7)/8 LENGTH OF THE RDCBK
IN DOUBLEWORDS
The area below is for DASD redefinitons:
0078 120 Bitstring 2 * DASD - IBM RESERVED
007A 122 Bitstring 2 RDCPCYL DASD - NUMBER OF PAGES/CYLINDER
007C 124 Signed 2 RDCDEVLM DASD (CP-owned only) Number of
slots to be allocated before
switching to another DASD.
007E 126 Signed 2 RDCMAXPR DASD (CP-owned only) Theoretical
paging rate based on average SEEK
time divided into 1 second
multipled by 10.
0080 128 Signed 2 RDCMASK DASD (CP-owned only) Used as a
mask for slot allocation of
records on cylinder and head
zero. It is a mask for the total
number of records that are not
used for that track.
0082 130 Bitstring 1 RDCPPTRK DASD - Number of pages/track 4K
0083 131 Bitstring 1 RDCTPGEX DASD (CP-owned only) Count of
DASD paging exposures.
00000001 RDCSNGEX 1 DASD (CP-owned only) Code used
to determine if the DASD is a
single exposure device.
0084 132 Bitstring 1 RDCPAGFG DASD (CP-owned only) Paging flags
to indicate more characteristics
about the DASD.
.... ...1 RDCCPOWN X'01' RDCCPOWN DASD (CP-owned
only) Indicates that this DASD is
fully supported by CP.
.... ..1. RDCMINID X'02' RDCMINID DASD (CP-owned
only) Indicates that this DASD
supports paging I/O for
minidisk-pools.
.... .1.. RDCPAGOY X'04' RDCPAGOY DASD (CP-owned
only) Used mainly for 3350 11/21
which indicates that paging only
space is allowed for this volume.
0085 133 Bitstring 1 RDCFLAG DASD flags
.... ..1. RDCLRE X'02' RDCLRE DASD This
DASD/control unit combination
supports the Locate Record
Extended CCW
.... ...1 RDCMDC X'01' RDCMDC DASD This device
type is supported by minidisk
cache.
0086 134 Bitstring 1 * (2) Reserved for IBM use
0088 136 Address 4 RDCCPVOL DASD (CP-owned only) Address of
the queue that this DASD would
reside on if it is fully CP
supported. The queue is located
in HCPPGD.
008C 140 Signed 4 RDCMLOAD DASD (CP-owned only) Initial
MLOAD for paging DASD based on
average SEEK time divided by 16
micro seconds.
0090 144 Bitstring 1 RDCNPSEC (14) DASD (CP-owned only) Sector
numbers for a CP-owned or
minidisk-pool DASD that is
formatted with 4k records without
pad records.
009E 158 Bitstring 1 RDCSECTR (14) DASD (CP-owned only) The sector
numbers for a CP-owned DASD that
was formatted with CPFORMAT. The
tracks are formatted with pad
records.
00AC 172 Signed 4 RDCDPSBK Address of DPSBK table. Contains
the number of records per track
of each standard or non-standard
record size.
00B0 176 Signed 4 RDCQRTIM Max number of minutes to respond
to a Quiesce/Resume request
00B4 180 Bitstring 20 * Reserved for IBM use
*** Bytes defined for CKD/ECKD DASD RDC Features field
0006 6 Bitstring 1 RDCVFAC Program-visible facilities
.... 1... RDCSSCSP X'08' RDCSSCSP Set System
Characteristics is supported
.... .1.. RDCSSCRC X'04' RDCSSCRC Set System
Characteristics has been received
for this Path Group
.... ..1. RDCPRFX X'02' RDCPRFX Prefix CCW
supported & enabled
0007 7 Bitstring 1 RDCVFAC2 Program-visible facilities 2
.1.. .... RDCVPAVU X'40' RDCVPAVU PAV is unsupported
for this DASD, only valid if
RDCSSCRC is set
0008 8 Bitstring 1 * Reserved for future IBM use
0009 9 Bitstring 1 RDCSFEAT SUBSYSTEM FEATURES SUPPORTED
1... .... RDCCFW X'80' RDCCFW SUPPORTS
NON-RETENTIVE DATA (CACHE FAST
WRITE)
.1.. .... RDCCFLF X'40' RDCCFLF SUPPORTS LOCK
FACILITY (CFLF) RPQ
..1. .... RDCRCS X'20' RDCRCS SUPPORTS RECORD
CACHE RPQ
.... 1... RDCDUP X'08' RDCDUP Supports Duplex
Pairs
.... .1.. RDCDFW X'04' RDCDFW SUPPORTS DASD FAST
WRITE
*** Bytes defined for CKD/ECKD DASD RDC Field 1
000C 12 Bitstring 2 RDCMCYL NUMBER OF PRIMARY CYL
000E 14 Bitstring 2 RDCTPCYL NUMBER OF TRACKS PER CYLINDER
0010 16 Bitstring 1 RDCSECT NUMBER OF SECTORS
0011 17 Bitstring 3 RDCTOTRK TOTAL TRACK LENGTH USABLE
0014 20 Bitstring 2 RDCHA LENGTH OF HOME ADDR AND RECRD
ZERO
0016 22 Bitstring 1 RDCMODE TRACK CAP CALCULATION FORMULA
CODE
0017 23 Bitstring 5 RDCMDFR TRACK CAP CALCULATION FACTORS
001C 28 Bitstring 2 RDCALTCL ADDR OF FIRST ALTERNATE CYLINDER
001E 30 Bitstring 2 RDCALTRX NUMBER OF ALTERNATE TRACKS
0020 32 Bitstring 2 RDCDIAG ADDR OF FIRST DIAGNOSTIC CYLINDER
0022 34 Bitstring 2 RDCDIAGN NUMBER OF DIAGNOSTIC TRACKS
0024 36 Bitstring 2 RDCDVCYL ADDRESS OF FIRST DEVICE CYLINDER
0026 38 Bitstring 2 RDCDVTRK NUMBER OF DEVICE SUPPORT TRACKS
*** Bytes defined for CKD/ECKD DASD RDC Field 2
002A 42 Bitstring 1 RDCCUTYP CONTROL UNIT TYPE CODE
002B 43 Bitstring 1 RDCMRTPL MAX READ TRACKSET PARAMETER
LENGTH
002C 44 Bitstring 2 RDCMXR0 MAXIMUM RECORD ZERO DATA LENGTH
002E 46 Bitstring 1 RDC46 DASD SPECIFIC RESERVED
002F 47 Bitstring 1 RDCTRSSZ TRACK SET SIZE
0030 48 Bitstring 1 RDCATCCF ADDITIONAL TRACK CAPACITY
CALCULATION FACTOR
0031 49 Bitstring 2 RDC4950 DASD SPECIFIC RESERVED
0033 51 Bitstring 1 RDCLTHRS CONCOPY LOWER THRESHOLD
0034 52 Bitstring 1 RDC52 DASD SPECIFIC RESERVED
0035 53 Bitstring 1 RDCUTHRS CONCOPY UPPER THRESHOLD
0036 54 Bitstring 1 RDCDCUF Device and control unit features
.... .1.. RDCMIRR X'04' RDCMIRR Device is Mirroring
capable
0037 55 Bitstring 1 RDC55 DASD SPECIFIC RESERVED
0038 56 Bitstring 1 RDCRCUC REAL CU CODE
0039 57 Bitstring 1 RDCOBRCO OBR CODE
003A 58 Bitstring 2 RDC5859 DASD SPECIFIC RESERVED
003C 60 Signed 4 RDCMCYL32 NUMBER OF PRIMARY CYLINDERS
The area below is for FBA DASD:
*** Bytes defined for FBA RDCFEAT field.
0006 6 Bitstring 2 * Reserved for IBM use.
0008 8 Bitstring 1 RDCFBARE (0) Start of FBA architected area
0008 8 Bitstring 1 RDCOPER Device operation modes
.1.. .... RDCOVRRN X'40' RDCOVRRN Overrunnable
device
..1. .... RDCBURST X'20' RDCBURST Burst mode device
...1 .... RDCDATCH X'10' RDCDATCH Data chaining
supported
0009 9 Bitstring 1 RDCFBAFT Features
.1.. .... RDCREMOV X'40' RDCREMOV Removable media
feature
..1. .... RDCRRLSE X'20' RDCRRLSE Reserve/release
feature
.... 1... RDCMOVAM X'08' RDCMOVAM Movable access
mechanism
.... .1.. RDCFIXHM X'04' RDCFIXHM Fixed head
mechanism
*** Bytes defined for FBA DASD RDC Field 1
000C 12 Bitstring 2 RDCRECSZ Physical record size
000E 14 Bitstring 4 RDCBLKCG Blocks per cyclical group (track)
0012 18 Bitstring 4 RDCBLKAP Blocks per access position (cyl)
0016 22 Bitstring 4 RDCBLKMA Blocks under movable access
001A 26 Bitstring 4 RDCBLKFA Blocks under fixed access
001E 30 Bitstring 1 * (2) Reserved for IBM use
0020 32 Bitstring 2 RDCBLKCE Blocks in CE area
0022 34 Bitstring 1 * (6) Reserved for IBM use
The area below is for tape drives:
*** Bytes defined for TAPE RDCFEAT field.
0006 6 Bitstring 2 * Reserved for IBM use.
0008 8 Bitstring 1 RDCFET3 RDC Data byte 8
...1 .... RDCTRAM X'10' RDCTRAM Tape has
Asyncronous Msg support
.... 1... RDCTCUIR X'08' RDCTCUIR Tape supports CUIR
(SIC)
.... .1.. RDCCPNOP X'04' RDCCPNOP Supports Channel
Path NOP command
0009 9 Bitstring 1 RDCFETFE Features
.1.. .... RDCCMPCT X'40' RDCCMPCT RDC DATA BYTE 9
COMPACTION IND.
...1 .... RDCLIBON X'10' RDCLIBON Library Manager
online
.... 1... RDCLAFIN X'08' RDCLAFIN Library Attachment
Ftr installed
*** Bytes defined for TAPE RDC Field 1
000C 12 Bitstring 28 RDCTAPE1 (0) TAPE SPECIFIC RESERVED
000C 12 Bitstring 5 * Reserved
0011 17 Bitstring 1 RDCFET4 RDC Data Byte 17
...1 .... RDCB17B3 X'10' RDCB17B3 RDC Data Byte 17
Bit 3
0012 18 Bitstring 13 * Reserved
001F 31 Bitstring 1 RDCFET5 RDC Data Byte 31
...1 ..11 RDCENCR X'13' RDCENCR Supports Encryption
...1 .1.1 RDCENCR2 X'15' RDCENCR2 Supports
Encryption 2
0020 32 Bitstring 3 RDCLIBSQ Library Sequence Number
0023 35 Bitstring 1 RDCLIBID Library Subsystem ID
0024 36 Bitstring 4 * Reserved
*** Bytes defined for TAPE RDC Field 2
002A 42 Bitstring 22 RDCTAPE2 TAPE SPECIFIC RESERVED
New Tape Product (NTP) redefinitions:
0006 6 Bitstring 1 RDCFRMAT RDC Format 6
.... .... RDCOLDT X'00' RDCOLDT Defines Tape RDC
info before NTP
.... ...1 RDCNTP X'01' RDCNTP Defines NTP RDC
information
0007 7 Bitstring 3 RDCSSF1 (0) Subsystem Facilities 1 7-9
0007 7 Bitstring 1 * No fields defined 7
0008 8 Bitstring 1 * Same as RDCFET3, above 8
0009 9 Bitstring 1 * Same as RDCFETFE, above 9
000A 10 Bitstring 2 * Reserved 10-11
000C 12 Bitstring 4 RDCSSF2 (0) Subsystem Facilities 2 12-15
000C 12 Bitstring 1 RDCSSF20 SSF2, byte 0 12
000D 13 Bitstring 1 RDCSSF21 SSF2, byte 1 13
1... .... RDCRDFWD X'80' RDCRDFWD Device supports
Read Forward CCW
.... .1.. RDCMODST X'04' RDCMODST DEVICE SUPPORTS
MODE SET/SENSE CCW
000E 14 Bitstring 1 RDCSSF22 SSF2, byte 2 14
..1. .... RDCTSSCS X'20' RDCTSSCS Tape Set System
Characteristics is supported
.... .1.. RDCMEDSC X'04' RDCMEDSC Medium Sense and
Chars supported
000F 15 Bitstring 1 RDCSSF23 SSF2, byte 3 15
0010 16 Bitstring 1 RDCDVTYM Device Type-Model 16
0011 17 Bitstring 2 RDCDVMPL Device Manufacturer and 17-18
Plant of Manufacture
0013 19 Bitstring 3 RDCDVSEQ Device Sequence Number 19-21
0016 22 Bitstring 1 RDCCUTYM Control Unit Type-Model 22
0017 23 Bitstring 2 RDCCUMPL Control Unit Manufacturer 23-24
and Plant of Manufacture
0019 25 Bitstring 3 RDCCUSEQ Control Unit Sequence Number25-27
001C 28 Bitstring 1 * Reserved for IBM use 28
001D 29 Bitstring 1 RDCLBTYM Library Type-Model 29
001E 30 Bitstring 1 * Reserved for IBM use 30
001F 31 Bitstring 1 RDCEPI ERDS Physical Identifer 31
0020 32 Bitstring 3 * Same as RDCLIBSQ, above 32-34
0023 35 Bitstring 1 * Same as RDCLIBID, above 35
0024 36 Bitstring 2 RDCVLLID Volume Loader Identifier 36-37
0026 38 Bitstring 1 RDCDEVID Device Identifier 38
0027 39 Bitstring 1 * Reserved 39
0028 40 Bitstring 1 * Same as RDCMDRID, above 40
0029 41 Bitstring 1 * Same as RDCOBRID, above 41
002A 42 Bitstring 1 RDCDVCOD OS Device Code=Class=Type 42
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