|
|
|
Figure 2-106 shows the DASD Skew Analysis Report inquiry panel. A description of the inquiry fields is presented in Section 2.4.5.4.1 in the discussion on component operation.
/------------------------ IOA DASD Skew Analysis Report ------------------------\ | Command ===> | | | | Composing CA MICS Inquiry: IOA25 - DASD Skew 10:00 / SYSA | | | | Time-span ===> DETAIL (DETAIL/DAYS) Cycle(s) ===> 01 - 01 | | Data base ===> B (PRIMARY) _ _ _ _ | | Allow Run-Time Override of Data Base ===> N (Y/N) and/or Cycle(s) ===> N (Y/N) | | | | Report by time interval ===> N (Y/N) | | | | Data Selection: Allow run-time override | | Date ===> _______ - _______ _______ - _______ ===> N (Y/N) | | Hour ===> 10 - __ __ - __ __ - __ ===> N (Y/N) | | Zone ===> _ _ _ _ _ _ _ _ _ ===> N (Y/N) | | Sysid ===> SYSA ____ ____ ____ ____ ____ ===> N (Y/N) | | | | Specify extended options ===> N (Y/N) | | | | | | | | | \-------------------------------------------------------------------------------/
Figure 2-106. IOA DASD Skew Analysis Report Inquiry Panel
Figure 2-107 shows a sample DASD Skew Analysis Report created
by the inquiry entries shown above. The following items are
shown in the figure:
INTERVAL The time and date of the first HARDVA File
START: observation included in the analysis.
INTERVAL The time and date of the last HARDVA File
END: observation included in the analysis.
DURATION: The total number of hours summarized by report,
rounded up to the nearest hour.
SYSID: The system identifier.
CU ADR/ The control unit address, CA MICS data element
CU/PATH: CUADDR.
For MVS/XA and ESA this column is replaced by
the value CU/PATH. In MVS/XA or ESA control
unit number is the equivalent data element to
control unit address in MVS/370.
For data derived from RMF 4.2 and above, the
control unit name is also shown in the line just
below the control unit number.
LOG. CHAN/ The logical channel number that serves the
LCU: control unit, CA MICS data element LOGCHAN.
For MVS/XA and ESA, this column is replaced by
the value LCU (logical control unit). The
logical control unit data element was introduced
in MVS/XA. There is no corresponding data
element to logical channel in MVS/XA.
AV CHAN The weighted average physical channel service
SERV MS/ time for the physical channels that comprise the
AV LCU logical channel.
SERV MS:
For MVS/XA and ESA, this column is replaced by
the AV LCU SERV MS, the average connect time for
devices on the logical control unit.
TOTAL SIO The total rate of start I/Os (SIOs) issued per
RATE/ second to the devices on the string by the
TOTAL system.
SSCH RTE:
For MVS/XA and ESA, this column is replaced by
TOTAL SSCH RTE, the total rate of start sub-
channel commands issued per second to the
string.
TOTAL The total utilization of the head of string
% HOS: (HOS). For pre-MVS/XA systems, the value is
calculated by multiplying the total number of
SIOs times the average channel service time in
milliseconds, divided by the duration.
For MVS/XA and ESA systems, the value is
calculated by dividing the sum of the device
connect times by the duration.
TYPE LINE: There are seven lines of detailed data presented
for each device string. The TYPE LINE values
describe the values that are found in the next
eight columns, DEV 1 through DEV 8. These
columns correspond to device addresses 0-7 and
8-F for non-3380 device types. For 3380s
without the Device Level Selection feature, the
first four columns are used to represent the
internal device strings. They are:
String Addresses
------ ---------
1 0,1,8,9
2 2,3,A,B
3 4,5,C,D
4 6,7,E,F
The types of lines are:
o DEVADDR - The device address on the string,
DEVADDR. For MVS/XA and ESA, this row is
replaced by the value DEV NO., the
corresponding data element to device address
in MVS/370.
o SIO RT - The rate of start I/Os (SIOs per
second) issued to each device by the system,
DVASIO. For MVS/XA and ESA systems, this row
is replaced by SSCH RT, the rate of start
subchannel commands issued to the device.
o AV SERV - The average service time for the
device, DVAAVSTM.
o % PATH - The percent of the path used by the
device, computed like TOTAL % HOS. See
above.
o VOLSER - The volume serial number of the
volume mounted on the device.
o STGGRP - The DFSMS storage group name. DFSMS
(Data Facility Storage Management Subsystem)
allows for pooling physical DASD volumes.
Each pool is defined by the installation's
DASD administrator, and is managed by DFSMS.
o DEVTYPE - The DASD device type of each
reported volume. (For example, 3380J, or
3390).
CV: The coefficient of variation of the non-zero
percent path busy values for the devices on the
string. It is important to note that idle
devices are not included in the calculations.
To calculate the coefficient of variation, at
least one of the percent device busy values must
be non-zero. The higher the coefficient of
variation, the more significant the skew problem
of the string.
SKEW: The skew coefficient of the non-zero percent
path busy values for the devices on the string.
It is important to note that idle devices are
not included in the calculations. To calculate
the skew coefficient, at least two of the
percent device busy values must be non-zero.
The higher the skew coefficient, the more
significant the skew problem of the string.
If the Device Level Selection (DLS) feature is in effect,
then there will only be one set of values for CU/PATH, LCU,
AV CHAN SERV MS, TOTAL SSCH RTE, TOTAL % HOS, CV, and SKEW
presented for the up to 16 device addresses associated with
each control unit or control unit pair.
If the Device Level Selection Enhanced (DLSE) feature is in
effect, reflecting the utilization of 3990-2 or 3990-3
controllers, then there will only be one set of values for
CU/PATH, LCU, AV CHAN SERV MS, TOTAL SSCH RTE, TOTAL % HOS,
CV, and SKEW presented for the up to 64 device addresses
associated with each logical control unit.
CA MICS Performance Manager DASD SKEW ANALYSIS INTERVAL START: 07SEPyy:09:59 INTERVAL END : 07SEPyy:10:59 DURATION : 2:00:00 SYSID : XA01 CU / AV LCU TOTAL TOTAL TYPE CV / PATH LCU SERV MS SSCH RTE % HOS LINE DEV 1 DEV 2 DEV 3 DEV 4 DEV 5 DEV 6 DEV 7 DEV 8 SKEW ----- ---- ------- -------- ------- -------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 570-3 0009 25.06 5.7 14.26 DEV NO. 574 575 57C 57D 1.69 3880 SSCH RT 5.3 0.2 0.2 0.0 1.73 AV SERV 37.37 17.63 27.38 0.00 % PATH 14.02 0.12 0.12 0.00 VOLSER TSO920 TSO900 TSO904 VSAM04 STGGRP TSODEV TSOPRD TSODEV DBMS02 DEVTYPE 3380 3380 3380 3380 8C0-0 0018 3.99 14.3 6.13 DEV NO. 8C0 8C1 8C2 8C3 8C5 8C6 8C7 --SEE-- * DLSE* 3390-2 SSCH RT 0.0 0.0 0.0 0.0 4.0 1.3 0.1 -BELOW- ANY 4 AV SERV 0.78 0.77 0.77 0.77 9.41 4.50 11.65 DEVICES % PATH 0.00 0.00 0.00 0.00 1.14 0.33 0.04 CAN BE VOLSER M24RSS M32SPL M32RSS M28RSS M18SPL M18RS1 TAS002 ACTIVE STGGRP N/A SYSTEM N/A N/A SYSTEM N/A TECSUP DEVTYPE 3390 3390 3390 3390 3390 3390 3390 8C0-0 0018 -------SEE ABOVE------- DEV NO. 8C8 8C9 8CA 8CB 8CC 8CD 8CE 8CF --SEE-- * DLSE* 3390-2 SSCH RT 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 -BELOW- ANY 4 AV SERV 0.78 0.85 4.89 8.25 0.79 7.16 8.52 8.45 DEVICES % PATH 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.06 CAN BE VOLSER HDK008 MSH009 MSH010 MSH011 MSH012 MSH013 TAS020 TS0021 ACTIVE STGGRP N/A MSHGRP MSHGRP MSHGRP MSHGRP MSHGRP TECSUP TSODEV DEVTYPE 3390 3390 3390 3390 3390 3390 3390 3390 8C0-0 0018 -------SEE ABOVE------- DEV NO. 8D0 8D1 8D2 8D3 8D4 8D5 8D6 8D7 --SEE-- * DLSE* 3390-2 SSCH RT 0.2 0.1 0.6 0.0 0.0 0.0 0.0 0.0 -BELOW- ANY 4 AV SERV 15.74 8.45 7.08 8.61 3.40 0.78 0.81 0.83 DEVICES % PATH 0.22 0.03 0.15 0.00 0.00 0.00 0.00 0.00 CAN BE VOLSER TSO029 TSO026 TSO027 TSO028 TSO030 TSO031 TSO032 TSO033 ACTIVE STGGRP TSUPRD TSODEV TSODEV TSOPRD N/A N/A N/A N/A DEVTYPE 3390 3390 3390 3390 3390 3390 3390 3390 8C0-0 0018 -------SEE ABOVE------- DEV NO. 8D8 8D9 8DA 8DB 8DC 8DD 8DE 8DF 2.66 * DLSE* 3390-2 SSCH RT 0.0 0.0 0.2 0.1 0.0 0.3 0.0 0.0 0.97 ANY 4 AV SERV 4.59 5.72 9.87 7.50 0.77 13.90 0.80 14.23 DEVICES % PATH 0.00 0.00 0.09 0.04 0.00 0.12 0.00 0.02 CAN BE VOLSER TSO034 TSO035 TSO036 TSO037 TEC003 TMP072 MSH015 MSH014 ACTIVE STGGRP TSOPRD TSOPRD TSODEV N/A TECSUP TECSUP MSHGRP MSHGRP DEVTYPE 3390 3390 3390 3390 3390 3390 3390 3390
Figure 2-107. IOA DASD Skew Analysis Report for MVS/XA
| Copyright © 2012 CA. All rights reserved. | Tell Technical Publications how we can improve this information |