z/OS Communications Server: SNA Network Implementation Guide
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Tuning statistics file report for multipath channel connections

z/OS Communications Server: SNA Network Implementation Guide
SC27-3672-01

Table 1 shows the format of the record written to the appropriate tuning statistics file. For each MPC group, a minimum of three records are written. For each OSA-Express MPC group, a minimum of eight records are written. The first record contains statistics for the entire MPC group. The subsequent records contain statistics for each write subchannel, read subchannel, or OSA-Express datapath queue.

Table 1. Record format for multipath channel connections (channel)
Offset Length Format Description
  0   2 Binary Record length
  2   3 Binary Reserved
  5   1 Binary Record type
  6   4 Binary Time record moved to buffer
  10   4 packed Date: 01YYDDDF Date: 00YYDDDF
  14   4 EBCDIC  System identification
  18   8 EBCDIC  MPC line name
  26   4 Binary Dump load restart requests (DLRMAX)
  30   4 Binary Number of inbound PIUs (IPIU) 1
  34   4 Binary Number of outbound PIUs (OPIU) 1
  38   4 Binary Number of timer sweeps (TSWEEP) 1, 3
  42   4 Binary Number of queue sweeps (QSWEEP) 1, 3
  46   4 Binary Number of write records
  46   4 EBCDIC Device address (DEV) 2
  50   4 Binary Number of read records 1
  50   4 Binary Transmit block size (BSIZE) 2
  54   4 EBCDIC Subchannel polarity (DIR) 2
  58   4 EBCDICBinary

Transmit or receive byte count (BYTECNT) 2, 4
  62   1 Binary CTCA extension length (including this field)
  63   1 Binary CTCA attachment type

X'01' 1

X'02' 2

X'04' 4
  64   2 EBCDIC  CTCA version = X'F0F2'
  66   4 Binary Overflow byte count (BYTECNTO) 2, 4
  70   4 Binary Slowdown frequency (SLOWDOWN) 2
  74   4 Binary Number of SIO issued (SIO) 2
  78   4 Binary Max transmit size (MAXBYTES) 2
  82   4 Binary Reserved
  86   4 Binary Reserved
  90   4 Binary Reserved
  94   4 Binary Number of inbound NLPs (INLP)
  98   4 Binary Number of outbound NLPs (ONLP)
  102   4 Binary NLP byte count
  106   4 Binary NLP byte count overflow
  110   4 Binary Number of OSA-Express datapath queues 1
  114   4 Binary OSA-Express PCIR overflow for READ queue 4

OSA-Express maximum SBALs for WR/x queue 4
  118   4 Binary OSA-Express PCIR count for READ queue 4

OSA-Express average SBALs for WR/x queue 4
  122   4 Binary OSA-Express PCIV overflow for READ queue 4

OSA-Express maximum queue depth for WR/x queue 4
  126   4 Binary OSA-Express PCIV count for READ queue 4

OSA-Express average queue depth for WR/x queue 4
  130   4 Binary OSA-Express PCIT overflow for READ queue 4

OSA-Express SIGA overflow for WR/x queue 4
  134   4 Binary OSA-Express PCIT count for READ queue 4

OSA-Express SIGA count for WR/x queue 4
  138   4 Binary OSA-Express PCIU overflow for READ queue 4

OSA-Express SBAL count overflow for WR/x queue 4
  142   4 Binary OSA-Express PCIU count for READ queue 4

OSA-Express SBAL count for WR/x queue 4
  146   4 Binary OSA-Express processing deferrals overflow for READ queue 4

OSA-Express packet count overflow for WR/x queue 4
  150   4 Binary OSA-Express processing deferrals for READ queue 4

OSA-Express packet count for WR/x queue 4
  154   4 Binary OSA-Express replenishment deferrals overflow for READ queue 4

OSA-Express or Hipersockets accelerated packet count overflow for WR/x queue4
  158   4 Binary OSA-Express replenishment deferrals for READ queue 4

OSA-Express or Hipersockets accelerated packet count for WR/x queue4
  162   4 Binary OSA-Express reads exhausted overflow for READ queue 4

OSA-Express or Hipersockets accelerated byte count overflow for WR/x queue4
  166   4 Binary OSA-Express reads exhausted for READ queue 4

OSA-Express or Hipersockets accelerated byte count for WR/x queue4
  170   4 Binary OSA-Express SBAL count overflow for READ queue 4

Undefined for WR/x queue4
  174   4 Binary OSA-Express SBAL count for READ queue 4

Undefined for WR/x queue4
  178   4 Binary OSA-Express early interrupt count overflow for READ queue 4

Undefined for WR/x queue4
  182   4 Binary OSA-Express early interrupt count for READ queue 4

Undefined for WR/x queue4
  186   4 Binary OSA-Express early interrupt phase II spinout count overflow for READ queue 4

Undefined for WR/x queue4
  190   4 Binary OSA-Express early interrupt phase II spinout count overflow for READ queue 4

Undefined for WR/x queue4
  194   4 Binary OSA-Express packet count overflow for READ queue 4

Undefined for WR/x queue 4
  198   4 Binary OSA-Express packet count for READ queue 4

Undefined for WR/x queue 4
  202   4 Binary OSA-Express or Hipersockets accelerated packet count overflow for READ queue 4

Undefined for WR/x queue 4
  206   4 Binary OSA-Express or Hipersockets accelerated packet count for READ queue 4

Undefined for WR/x queue 4
  210   4 Binary OSA-Express or Hipersockets accelerated byte count overflow for READ queue 4

Undefined for WR/x queue 4
  214   4 Binary OSA-Express or Hipersockets accelerated byte count for READ queue 4

Undefined for WR/x queue 4
  218   4 Binary OSA-Express3 or later frame invalidation packet count overflow for READ queue 4

Undefined for WR/x queue 4
  222   4 Binary OSA-Express3 or later frame invalidation packet count for READ queue 4

Undefined for WR/x queue 4
  226   32 Binary Reserved
  258   8 EBCDIC READ queue name 4

Undefined for WR/x queue 4
Notes:
  1. Indicates fields used only in the first record for statistics on the group.
  2. Indicates fields used only in subsequent records for statistics on each write and each read subchannel.
  3. TSWEEP and QSWEEP are always 0 for HPDT MPC connections.
  4. Indicates fields used only in subsequent records for statistics on each OSA-Express or Hipersockets datapath queue.
Parent topic: Tuning I/O operations for multipath channel connections

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