Device Data Section

There is one section per device.

Offsets		Name	Length	Format	Description
0	0	SMF74NUM	2	binary	Device number, in the range X'0000' to X'FFFF'.
2	2	SMF74LCU	2	binary	Logical control unit number, in the range X'0000' to X'FFFF'.
4	4		1		Reserved.
5	5	SMF74CNF	1	binary	Device indicator Bit Meaning when set 0 IOS queue length is incorrect 1 No logical control unit information 2 Data contained in fields SMF74SSC through SMF74DIS is incorrect 3 Device has been deleted 4 Only partial statistics are available 5 Reserved. 6 Data recorded is incorrect because device was configured during interval 7 Device is currently online.
6	6	SMF74SER	6	EBCDIC	Volume serial of the volume mounted on this device (tape or direct access device only).
12	C	SMF74TYP	4	binary	Unit type.
16	10	SMF74NUX	4	binary	Number of unit control blocks (UCBs) for a parallel access volume. For HyperPAV base devices (bit 6 of SMF74CNX is set), this is the accumulated number of HyperPAV aliases.
20	14	SMF74SSC	4	binary	Start subchannel count. This is the number of physical requests to the device and includes SSCH and RSSCH instructions.
24	18	SMF74MEC	4	binary	Measurement event count (number of SSCH instructions for which connect, pending, and active times were stored).
28	1C	SMF74CNN	4	binary	Device connect time (in 128-microsecond units).
32	20	SMF74PEN	4	binary	Device pending time (in 128-microsecond units).
36	24	SMF74ATV	4	binary	Device active time (in 128-microsecond units).
40	28	SMF74DIS	4	binary	Device disconnect time (in 128-microsecond units).
44	2C	SMF74QUE	4	binary	Number of requests queued in IOS for this device.
48	30	SMF74UTL	4	binary	Number of samples when the device was reserved but an SSCH instruction had not been issued to the device.
52	34	SMF74RSV	4	binary	Number of samples taken when the device was reserved.
56	38		4		Reserved.
60	3C	SMF74ALC	4	binary	Number of samples taken that indicated that the device was allocated.
64	40	SMF74MTP	4	binary	Number of samples taken that indicated a mount pending condition.
68	44	SMF74NRD	4	binary	Number of samples taken that indicated that the device was not ready.
72	48	SMF74COF	2	binary	Number of requests that had hardware timer overflow for connect time measurement.
74	4A	SMF74ICT	2	binary	Number of incorrect samples.
76	4C	SMF74DVB	4	binary	Device busy delay time, from subchannel information block (SCHIB) (in 128-microsecond units).
80	50		4		Reserved.
84	54	SMF74CLF	1	binary	DASD report control flag Bit Meaning when set 0 Number option active indicator 1 Storage group option active indicator 2 Storage group name changed during the interval 3 Mount pending condition exists at the start of the interval 4 Mount pending condition exists at end of the interval 5 Reserved 6 CTC with special protocol 7 Reserved.
85	55		3		Reserved.
88	58	SMF74SGN	8	EBCDIC	Storage group name as defined by DFSMS.
96	60	SMF74NDA	4	binary	Total number of allocations in effect for the device.
100	64	SMF74DEV	8	EBCDIC	Device model name. This field is blank if device name cannot be determined.
108	6C	SMF74CU	8	EBCDIC	Control unit name. Blank if control unit name cannot be determined.
116	74		4		Reserved.
120	78	SMF74CNX	1	binary	Device flag extensions: Bit Meaning when set 0 Device dynamically changed 1 Device disconnect time is not valid 2 Base exposure of a parallel access volume 3 Number of alias exposures has changed 4 Timing facility not active 5 Device connect time is invalid 6 HyperPAV base device 7 Device connected to FICON®.
121	79		1		Reserved.
122	7A	SMF74MTC	2	binary	Number of tape mounts detected against the device during the interval.
124	7C	SMF74DTS	1	binary	Shared Device report control flag Bit Meaning when set 0 Valid node descriptor ID retrieved 1 No valid node descriptor ID retrieved 2 Reserved 3 SMF74SHR is valid 4 Device is shared/assigned to multiple systems 5–7 Reserved.
125	7D	SMF74DCT	28	EBCDIC	Node descriptor ID for selfdescribing devices (if bit 0 of SMF74SRD on). 4-byte device number in EBCDIC format left justified with trailing blanks (if bit 1 of SMF74DTS is on).
153	99	SMF74HPC	1	binary	Number of HyperPAV aliases configured for that LSS.
154	9A	SMF74NSS	2	binary	Number of skipped samples caused by too large delta values.
156	9C	SMF74PSM	4	binary	Number of successful PAV samples.
160	A0	SMF74PCT	4	binary	Number of unsuccessful PAV counts.
164	A4	SMF74CMR	4	binary	Command response time in units of 128 microseconds.
168	A8	SMF74CAP	4	binary	DASD volume capacity (specified by the number of available cylinders).
172	AC	SMF74IDT	4	binary	Interrupt delay time in units of 128 microseconds. This field is zero if not supported by the hardware.
176	B0	SMF74CUQ	4	binary	Control Unit Queuing Time.
180	B4		1		Reserved.
181	B5	SMF74SCS	1	binary	Subchannel set ID.
182	B6	SMF74NM2	2	binary	Device number (same as SMF74NUM).