DEV - Device Delays Report

The Device Delays report (DEV) shows jobs delayed by contention for devices. RMF lists the jobs included by descending delay percentages; that is, the job experiencing the most significant delay appears first.

How to request this report

To request the Device Delays report, select 3 from the Primary Menu and then select 2 on the Resource Report Selection Menu (shown in Figure 1), or enter the following command: 
DEV [job_class,service_class]
For example, to get a Device Delays report for TSO service class TSOPRIME, enter: 
DEV T, TSOPRIME

Contents of the report

Figure 1. DEV Report
                        RMF V2R4  Device Delays                  Line 1 of 57
Command ===>                                                  Scroll ===> HALF

Samples: 100     System: MVS1  Date: 05/11/19  Time: 10.03.20  Range: 100   Sec

           Service  DLY USG CON  ------------ Main Delay Volume(s) ------------
Jobname  C Class     %   %   %    %  VOLSER   %  VOLSER   %  VOLSER   %  VOLSER

MARYPATM B NRPRIME   70  51  54   70 TSOL11    1 DUMP00
MICHAELL B NRPRIME   39  15  14   39 BPXLK1
MCPDUMP  S SYSSTC    36  18  20   36 D24PK2
CHARLESR B NRPRIME   33  13  13   28 BPXLK1    3 HSML02    2 BPXSSK
DFHSM    S SYSSTC    30  83  35   10 HSML17    5 SMS026    4 HSMOCD    4 HSMBCD
SHUMA3   T TSOPRIME  18  52  53   13 D83ID0    5 HSML02
DAVEP    T TSOPRIME  16   9  10    4 HSM009    3 HSM005    2 HSML06    1 SMS013
CATALOG  S SYSTEM     9  15  21    2 CLR007    1 HSM036    1 HSM018    1 HSM011
DB2MDBM1 S SYSSTC     9   7   5    7 DB2MS2    1 DB2MD0    1 DB2MS0
GINNI    T TSOPRIME   8  10   9    3 HSML17    2 CLR010    1 HSM032    1 NATPK1
TREVORJ  T TSOPRIME   6  10  11    2 HSM022    1 HSM001    1 RESPK1    1 HSM024
RHANSON  T TSOPRIME   6   9   8    4 HSML17    1 RESPK1    1 NATPK1
KOCH     T TSOPRIME   6   3   3    2 HSML17    1 CLR010    1 HSM018    1 HSM043
RSTSHYS0 B NRPRIME    5   8   7    5 HSML17
BEENA    T TSOPRIME   5   6   6    4 HSM036    1 HSM020
CRISMAN  T TSOPRIME   5   6   3    4 HSML17    1 SMS005
JACKF    T TSOPRIME   5   4   1    2 HSML17    2 TSO063    1 HSM004

The graphic form of this report shows each user's device delay percentage and device using percentage.

Field descriptions

Table 1. Fields in the DEV Report
Field Heading Meaning
Jobname Name of a job that is delayed by device volumes. The Device Delay report does not summarize data by job groups; all jobs within a job group are reported individually.
C A one-character abbreviation for the job class as follows:
S
Started task
T
TSO
B
Batch
A
ASCH
O
OMVS
Service Class The name of the service class that a specified job has been running in.
DLY % Delay the waiting job (address space) is experiencing because of contention for devices during the report interval, expressed as a percentage.
Note: This DLY% value is also found in the DEV field on the job delay report.
USG% The percentage of time when the job is transferring data between DASD or tape and central storage. (Not just the volumes listed under the VOLSER columns on the report.)
Note: To find all the using volumes for a jobname you must scan an entire resource-oriented device delay (DEVR) report, using the FIND command.
CON % The percentage of time during the report interval when devices used by the address space were connected to channel path(s) that actually transferred data between the devices and central storage. This value measures connect time of the DEV volumes as well as I/O requests to any device on a block multiplex channel for which the measurement facility is active. RMF obtains connect time at each sample.
Note:
  1. When comparing the CON % and the USG% fields in this report, you must be aware that CON % is a measured multi-state value, while USG% is a sampled single state value. Thus, CON % includes time while the job was using more than one device at the same time, while USG % does not. The value in the CON % field might include more devices than the USG% field. The USG % field may include a considerable amount of delay.
  2. Some of the connect time from the previous range period might be included in the CON % value, while some of the connect time in the current report interval might be absent. This discrepancy is noticeable on devices that have very long channel programs, such as paging devices.
Main Delay Volume(s) Up to four DEV volumes contributing most to the delay of the job. The DEV volume having the largest delay percentage appears first.
VOLSER
The serial number of a DASD or tape contributing to the job delay.
%
The percentage of delay caused because the job was waiting to use the named volume.

Report options

Figure 2. DEV Report Options Panel
                       RMF Delay Report Options: DEV                Line 1 of 4
 Command ===>                                                  Scroll ===> HALF

 Change or verify parameters. To exit press END.
 Changes will apply to DELAY, DEV, ENQ, HSM, JES, PROC, PROCU, STOR, STORC,
 STORF, STORM, and XCF.

   Class         ===> ALL       Classes: ALL TSO BATCH STC ASCH OMVS
   Service class ===> *ALL      *ALL or one of available service classes below

   Jobs          ===> NO        View job selection/exclusion panel next (YES NO)

                            Available Service classes
 ZOSUN      OMVSKERN   PRDTSO     STCCMD     SYSTEM     SYSSTC

The DEV Report Options panel is similar to the Delay Report Options panel, but does not contain Summary or Criterion. See Report options (the Delay Report Options panel) for a description of the fields.

The parameters that you specify on this panel affect all job-oriented detail delay reports.