Bytes
Description
22
Track capacity calculation formula
23-27
Track capacity calculation factors F1 through F5
28-29
First alternate cylinder address
30-31
Number of alternate tracks
32-33
First diagnostic cylinder address
34-35
Number of diagnostic tracks
36-37
First device support cylinder address
38-39
number of device support tracks
40
MDR record ID
41
OBR record ID
42
Control unit type code
43
Read trackset parameter length
44-45
Maximum record zero length
46
Reserved
47
Track set size
48
Track capacity calculation factor F6
49-50
RPS sector calculation factors
51-53
Reserved
54
Device and control unit features
55
Reserved
56
Real control unit type code
57
Real device type code
58-63
Reserved
Table 22: Read Device Characteristics
The Read Configuration Data (RCD) contains configuration data. It shows how the internal disk
subsystem is configured. The RCD has the following format:
Bytes
Name
Description
000-031
NED1
Volume NED (logical volume within the subsystem)
032-063
NED2
NED for the RAID array
064-095
NED3
NED for the logical subsystem
096-127
NED4
Token NED (establishes a relationship among all configu-
ration data records in a control unit in the subsystem)
128-223
Reserved
224-255
QNEQ
General NEQ (describes paths and addresses)
Table 23: Read Configuration Data
Legend:
NED Node Element Descriptor
NEQ Node Element Qualifier
