I/O Queuing Activity Report
The IOQ control statement produces the I/O Queueing Activity Report. This report is available in both Total and Delta mode.
The header of this report shows the date and time the data was collected, the report mode, and the interval. Each row in this report reflects the activity of a single channel path. The following figure is an example of the I/O Queueing Activity Report.
BMC SOFTWARE, INC. REPORT DATE: MM/DD/YY 16:53:42
08/01/YY 10:40:11 TOTAL (10:11) SYSTEM: SJSC SJSC Z v.rr.n
EXTRACTOR INTERVAL - START=08/01/YY 10:30:00 LENGTH=15:00 I%= 68
CPU= 23/ 15 PAGING= 0
CHAN PREF DCM CNTL DCM GROUP LCU CONT DEL Q CSS CHPID %DP %CU CMR CUB
PATH PATH UNIT MIN MAX DEF RATE LNG DLY TAKEN BUSY BUSY DLY DLY
70 0101 000 0.00 0.00 5.17 0.02 0.00 0.00 0.00 0.00
E8 0105 002 0.00 0.00 0.11 0.03 0.00 0.00 22.53 0.00
EC 0106 003 0.00 0.00 0.10 0.03 0.00 0.00 34.89 0.00
BC 06D0 010 0.00 0.00 2.40 0.01 16.66 0.00 0.00 0.00
BF 06D0 0.01 0.00 0.00 0.00 0.00
FD 0BC0 02B 0.00 0.00 0.09 0.00 0.00 0.00 0.44 0.00
8E 0BC0 0.00 0.00 0.00 0.25 0.00
FC 0E60 02F 0.00 0.00 0.09 0.02 0.00 0.00 0.12 0.00
82 0E60 0.01 0.00 0.00 0.17 0.00
6E 1658 03A 0.00 0.00 0.08 18.23 0.00 0.00 0.00 0.00
05 2040 051 0.00 0.00 0.48 0.23 0.00 0.00 0.00 0.00
5E 3020 067 0.00 0.00 0.18 0.29 0.00 0.00 0.00 0.00
F0 4900 07A 0.00 0.00 0.11 1.02 0.00 0.00 0.14 0.00
F1 4900 1.07 0.00 0.00 0.14 0.00
E3 4900 1.03 0.00 0.00 0.14 0.00
E7 4900 0.99 0.00 0.00 0.14 0.00
F0 4A00 07B 0.00 0.00 0.13 3.82 0.00 0.00 0.10 0.00
F1 4A00 3.98 0.00 0.00 0.11 0.00
E3 4A00 4.07 0.00 0.00 0.10 0.00
E7 4A00 3.88 0.00 0.00 0.11 0.00
AC 5505 085 0.00 0.00 0.16 0.02 0.00 0.00 0.00 0.00
B8 5506 0.02 0.00 0.00 0.00 0.00
FD 8300 098 0.00 0.00 0.18 34.14 0.00 0.52 0.19 0.00
8E 8300 34.28 0.00 0.51 0.19 0.00
FD 833C 099 0.00 0.00 0.20 102.52 0.00 0.56 0.18 0.00
8E 833C 103.92 0.00 0.57 0.19 0.00
F3 8400 09A 0.00 0.00 0.08 0.08 0.00 0.00 0.13 0.00
F4 8400 0.08 0.00 0.00 0.15 0.00
F5 8400 0.10 0.00 0.00 0.13 0.00
F6 8400 0.10 0.00 0.00 0.13 0.00
FC 8500 09B 0.00 0.00 0.13 45.90 0.00 0.29 0.16 0.00
82 8500 45.84 0.00 0.35 0.17 0.00
FD 8700 09D 0.00 0.00 0.19 21.23 0.00 0.93 0.20 0.00
8E 8700 21.43 0.00 1.04 0.21 0.00
F7 8940 09F 0.00 0.00 0.00 0.06 0.00 0.00 0.00 0.00
F0 A200 0A6 0.00 0.00 0.10 7.68 0.00 0.00 0.13 0.00
F1 A200 8.06 0.00 0.00 0.13 0.00
E3 A200 7.82 0.00 0.00 0.13 0.00
E7 A200 7.83 0.00 0.00 0.13 0.00
The following table lists the header, ID (used when specifying keywords), and a brief description of each column in this report.
Column header | Column ID | Description |
|---|---|---|
CHAN PATH | CHANPATH | hexadecimal identifier of the online channel path that is attached to the physical control units in the LCU group |
PREF PATH | PREFPATH | path attribute; displayed for subsystems that support Preferred Pathing (for example, the 1750) The path attribute values that can appear are preferred (PF), nonpreferred (NP), and not specified (NS). |
DCM | CHANDCM | Dynamic CHPID Management (DCM); allows an installation to identify channels that they want to be managed dynamically These channels are not assigned to a specific control unit but belong to a pool of channels. The value in this column will be Y if the channel is under DCM. |
CNTL UNIT | CNTLUNIT | hexadecimal identifier of control units that are associated with an online channel path in the LCU group |
DCM GROUP – MIN MAX DEF | CHANGRP | DCM allows an installation to identify channels to be managed dynamically; the channels are not assigned to a specific control unit but belong to a pool of channels The values in columns MIN, MAX, and DEF report the minimum and maximum number of DCM-managed channels for one LCU (in this interval), as well as the installation-specified definition for this LCU .This data is available only for LCUs with DCM managed channel paths. Additionally, for all DCM-managed channel paths, the I/O activity rate, the director port contention, and the control unit contention are computed and shown. Note that these values can include managed channels that were only partially online. |
LCU | LCU | hexadecimal identifier for the LCU |
CONT RATE | CONTRATE | rate per second that delayed I/O requests are placed on the CU-HDR |
DEL Q LNG | DELQLNG | average number of delayed requests on the CU-HDR |
CSS DLY | CSSDLY | Average Channel Subsystem Delay field—contains the average number of milliseconds of delay that an I/O request encountered for the channel path because the channel subsystem was busy This value is present only when CMFMON is running on z990 or later-model processors. When present, the value is calculated as follows: Average channel subsystem = Channel subsystem delay time / Measurement event count |
CHPID TAKEN | CHPIDTKN | rate at which the CHPID is processing I/O requests for the LCU |
%DP BUSY | DPBUSY | level of contention for the director port |
%CU BUSY | CUBUSY | percentage of time that I/O requests to the devices on this LCU were delayed because a control unit was busy |
CMR DLY | CMRDLY | Average Initial Command Response Delay field—contains the average number of milliseconds that a successfully initiated start or resume function needs until the device indicates that the first command is accepted This value is present only when CMFMON is running on z990 or later-model processors. When present, the value is calculated as follows: Average Initial Command Response delay = Control unit busy delay time / Measurement event count |
CUB DLY | CUBDLY | Average Control Unit Busy Delay field--contains the average number of milliseconds of delay that an I/O request encountered for the channel path because the specified control unit was busy This value is present only when CMFMON is running on z990 or later-model processors. When present, the value is calculated as follows: Average Control unit busy delay = Control unit busy delay time / Measurement event count |
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