I/O Queuing Configuration Data Section

This section contains one per channel path within a logical control unit described by triplet R79ECPDS.

Offsets Name Length Format Description
0 0 R79ECPID 1 binary Channel path identifier.
1 1 R79ECPST 1 binary Channel path status
Bit
Meaning when set
0
Channel path installed
1
Channel path online
2
Channel path varied
3
Channel path offline to all devices of the LCU
4
Channel path connection to devices of the LCU altered by VARY PATH processing
5
Reserved.
6
Channel path is DCM managed.
7
CHPID manipulated, requiring data reset.
2 2 R79ECUN 2 binary Number of control units attached.
4 4 R79ECU1 2 binary First control unit identifier.
6 6 R79ECU2 2 binary Second control unit identifier.
8 8 R79ECU3 2 binary Third control unit identifier.
10 A R79ECU4 2 binary Fourth control unit identifier.
12 C R79ECUB 4 binary Number of initial selection attempts that were unsuccessful because the control unit was busy.
16 10 R79EPT 4 binary Number of I/O operations accepted on this channel path.
20 14   4   Reserved.
24 18 R79EDPBC 4 binary Number of initial selection attempts that were unsuccessful because the director port was busy.
28 1C R79ECBT 4 binary Control unit busy delay time.
32 20 R79ECMR 4 binary Initial command response time.
36 24 R79ESBS 4 binary Switch busy count summation; contains the switch busy counts received for all partitions.
40 28   4   Reserved.
44 2C R79ECPXF 1 binary Channel path extended flags
Bit
Meaning when set
0
Extended I/O measurement block available
1-7
Reserved.
45 2D R79ECPAT 1 binary Path attributes
Value
Meaning
0
Not specified for this path.
1
Preferred path.
2
Non-preferred path.
46 2E   2   Reserved.