Mainframe Tips, Tricks And Tutorials: 4HRA R4HA MSU

Showing posts with label 4HRA R4HA MSU. Show all posts

Wednesday, May 5, 2021

4HRA resets to 1 MSU after IPL

4HRA value resets to 1 MSU after IPL. This can be seen in RMF Monitor III.

RMF V2R4 CPC Capacity Line 1 of 16

Command ===> Scroll ===> CSR

Samples: 100 System: C101 Date: 04/29/21 Time: 04.33.20 Range: 100 Sec

Partition: C101 3907 Model W02 Boost: N

CPC Capacity: 280 Weight % of Max: 89.6 4h Avg: 1

Image Capacity: 280 WLM Capping %: 0.0 4h Max: 44 Group: N/A

MT Mode IIP: N/A C101 % IIP: N/A AbsMSUCap: N Limit: N/A

Partition --- MSU --- Cap Proc Logical Util % - Physical Util % -

Def Act Def Num Effect Total LPAR Effect Total

*CP 8.0 0.5 14.0 14.5

C101 0 36 N N N 2.0 13.1 13.2 0.1 13.1 13.2

C102 0 1 N N N 2.0 0.3 0.3 0.0 0.3 0.3

C103 0 2 N N N 2.0 0.7 0.7 0.0 0.7 0.7

C104 0 0 N N N 2.0 0.0 0.0 0.0 0.0 0.0

PHYSICAL 0.3 0.3

*IFL 0.0 0.0 0.0 0.0

PHYSICAL 0.0 0.0

*IIP 8.0 0.0 0.7 0.8

SYSVIEW 16.0 C101 - CPCLPAR, CPC LPAR Capacity Information 2021/04/29 05:02:40

Command ====> Scroll *===> PAGE

GSVX005I Beginning of data rows ---------------- Lvl 4 Row 1-14/49 Col 1-79/118

Partition C101 Avg Weight 895 Group n/a 4h Avg 6 2%

CPC Capacity 280 WLM Capping% n/a Limit n/a 4h Max 73 27%

Image Capacity 280 4h Unused 266 98%

-------------------------------------------------------------------------------

Cmd Intv Time SrvUnits SrvUTime Unused 1hMSU Pct% ...25...50...75..100

____ * TOTAL 28109385 03:58:10 265 7 3%

____ 1 05:02 2535136 00:03:10 224 48 18%

____ 2 04:59 6095872 00:05:00 199 73 27%

____ 3 04:54 4664704 00:05:00 216 56 21%

____ 4 04:49 3440832 00:05:00 231 41 15%

____ 5 04:44 4042528 00:05:00 223 49 18%

____ 6 04:39 3595040 00:05:00 229 43 16%

____ 7 04:34 3735232 00:05:00 227 45 17%

____ 8 04:29 1 00:04:59 280

____ 9 04:24 1 00:04:59 280

____ 10 04:19 1 00:04:59 280

____ 11 04:14 1 00:04:59 280

____ 12 04:09 1 00:04:59 280

____ 13 04:04 1 00:04:59 280

____ 14 03:59 1 00:04:59 280

____ 15 03:54 1 00:04:59 280

____ 16 03:49 1 00:04:59 280

____ 17 03:44 1 00:04:59 280

____ 18 03:39 1 00:04:59 280

____ 19 03:34 1 00:04:59 280

____ 20 03:29 1 00:04:59 280

____ 21 03:24 1 00:04:59 280

____ 22 03:19 1 00:04:59 280

____ 23 03:14 1 00:04:59 280

____ 24 03:09 1 00:04:59 280

____ 25 03:04 1 00:04:59 280

____ 26 02:59 1 00:04:59 280

____ 27 02:54 1 00:04:59 280

____ 28 02:49 1 00:04:59 280

____ 29 02:44 1 00:04:59 280

____ 30 02:39 1 00:04:59 280

____ 31 02:34 1 00:04:59 280

____ 32 02:29 1 00:04:59 280

____ 33 02:24 1 00:04:59 280

____ 34 02:19 1 00:04:59 280

____ 35 02:14 1 00:04:59 280

____ 36 02:09 1 00:04:59 280

____ 37 02:04 1 00:04:59 280

____ 38 01:59 1 00:04:59 280

____ 39 01:54 1 00:04:59 280

____ 40 01:49 1 00:04:59 280

____ 41 01:44 1 00:04:59 280

____ 42 01:39 1 00:04:59 280

____ 43 01:34 1 00:04:59 280

____ 44 01:29 1 00:04:59 280

____ 45 01:24 1 00:04:59 280

____ 46 01:19 1 00:04:59 280

____ 47 01:14 1 00:04:59 280

____ 48 01:09 1 00:04:59 280

********************************* End of Data *********************************

Friday, August 21, 2020

How Tivoli Decision Support for Z/OS reports 4HRA

Tivoli Decision Support for Z/OS leverages the SMF data to provide a variety of reports for various components of System Z. TDS maintains a database for different SMF record types which can be queried using QMF to provide reports on the fly. One such report is the monthly 4 hour rolling average report for each LPAR in the CEC. TDS provides ‘MVSPM_SYSTEM_H’ and ‘MVSPM_LPAR_H’ tables which contains the ‘MSU_4HRA’ (SMF70LAC) for each LPAR in the CEC. The below section establishes a reporting technique which will align with the SCRT report.

USING MVSPM_LPAR_H

‘MVSPM_LPAR_H’ provides hourly statistics on logical partitions and processor activity in a PR/SM environment. It contains data from SMF type 70. The ‘MSU_4HRA’ column contains the 4-hour rolling average for each logical partition. This value ‘MSU_4HRA’ in table ‘MVSPM_LPAR_H’ is the last effective 4 hour rolling average for the hourly interval (. MSU_4HRA = LAST (V_MSU_4HRA). For example, if your recording interval is 15 minutes then the ‘MSU_4HRA’ value reported for 20th hour in TDS will be the value which occurred at 20:45(the last effective 4HRA value for that hour). This is the reason your ‘MSU_4HRA’ value would not match with your SCRT value.

LPAR Name	SMF interval	15 min interval MSU 4HRA	1 Hour interval data in MVSPM_LPAR_H at 01:00:00
A	01:00:00	35
A	01:15:00	35
A	01:30:00	36
A	01:45:00	35	TDS Value : 35(Last Effective 4HRA)
LPAR Name	SMF interval	15 min interval MSU 4HRA	1 Hour interval data in MVSPM_LPAR_H at 03:00:00
A	03:00:00	33
A	03:15:00	33
A	03:30:00	34
A	03:45:00	34	TDS Value : 34(Last Effective 4HRA)
LPAR Name	SMF interval	15 min interval MSU 4HRA	1 Hour interval data in MVSPM_LPAR_H at 20:00:00
A	20:00:00	53
A	20:15:00	53
A	20:30:00	52
A	20:45:00	50	TDS Value : 50(Last Effective 4HRA)

USING MVSPM_SYSTEM_H

MVSPM_SYSTEM_H also contains the ‘MSU_4HRA’ (SMF70LAC) for each LPAR However, the value of MSU_4HRA reported in this table is the average (MSU_4RHA = Avg (SMF70LAC, INPUT_RECORDS) of SMF70LAC SMF interval records. The MSU_4HRA values reported in this table always matches your SCRT report because SCRT uses the mean of SMF interval records to aggregate an hourly record. For example, if your SMF recording interval is 15 minutes then the MSU_4HRA value reported for 20th hour will be the average of SMF interval records (In this case AVG (20:00,20:15,20:30,20:45).

LPAR Name	SMF interval	15 min interval MSU 4HRA	1 Hour interval data in MVSPM_LPAR_H at 01:00:00
A	01:00:00	35
A	01:15:00	35
A	01:30:00	36
A	01:45:00	35	TDS Value : 35.25(Average 4HRA)
LPAR Name	SMF interval	15 min interval MSU 4HRA	1 Hour interval data in MVSPM_LPAR_H at 03:00:00
A	03:00:00	33
A	03:15:00	33
A	03:30:00	34
A	03:45:00	34	TDS Value : 33.5(Average4HRA)
LPAR Name	SMF interval	15 min interval MSU 4HRA	1 Hour interval data in MVSPM_LPAR_H at 20:00:00
A	20:00:00	53
A	20:15:00	53
A	20:30:00	52
A	20:45:00	50	TDS Value : 52(Average 4HRA)

Tivoli Decision Support for Z/OS provides the functionality to track the last effective 4 Hour Rolling Average and Mean 4 Hour Rolling Average. It is very important to understand the context of each of these values while reporting. The ‘MVSPM_SYSTEM_H’ should be used as a baseline while comparing your results with SCRT. However, to keep track of the last effective 4 HRA in an hour ‘MVSPM_LPAR_H’ becomes an ideal choice.

How SCRT Reports the 4 Hour Rolling Average?

The Detail LPAR Data (N5) section of the SCRT report shows the interval (date and hour) during the month for each LPAR on a CPC when the LPAR reached a maximum rolling 4-hour average utilization value (in MSUs). It also shows the interval in which the sum of all the LPARs reached a maximum rolling 4-hour average value. The SMF Recording interval varies from site to site based on the installation needs. The SCRT algorithm calculates 4HRA values at the hourly interval by taking an hourly average of 4HRA values at each of the LPAR SMF intervals. In the below example the SMF recording interval for LPAR A is 15 minutes and the peak reported in SCRT occurred at 20:00, so SCRT here has taken the mean of all the 4 intervals of 20th hour.

LPAR Name	SMF interval	15 min interval SMF70LAC values	SCRT value reported in N5 section at 20th hour
A	20:00:00	53
A	20:15:00	53
A	20:30:00	52
A	20:45:00	50	Calculated value: AVG(20:00,20:15,20:30,20:45) 52 MSUs

Saturday, August 10, 2019

How rolling four hour average is calculated

WLM is responsible for sampling the MSU Utilization for each LPAR every 10 seconds. Every 5 minutes, WLM documents the highest observed MSU utilization sample from the 10 second bucket. This process keeps a track of the past 48 updates sampled for each LPAR. When the 49th observation is recorded, the 1st observation is discarded, and so on. These 48 observations of 5 minutes each represent a total of 5 minutes * 48 = 240 minutes or the past 4 hours rolling average (R4HA). WLM stores the average of these 48 values in the WLM control block RCT.RCTLACS. Every time RMF creates a Type 70 record, the current 4 hour rolling average from RCT.RCTLACS is populated in the SMF70LAC field representing the 4hour rolling average at the time of cut. This way we have the “4 Hour Rolling Average” being recorded as SMF70LAC for every Type70 record.

The below example shows how 4HRA is calculated. In this example the 4HRA at 04:00 is 271 MSUs which is average of all the 48 intervals of 5 minutes each from 00:00-4:00

OBS TIME MSU/Hr
1 00:00 220
2 00:05 259
3 00:10 278
4 00:15 262
5 00:20 312
6 00:25 225
7 00:30 234
8 00:35 289
9 00:40 285
10 00:45 262
11 00:50 283
12 00:55 310
13 01:00 302
14 01:05 289
15 01:10 263
16 01:15 213
17 01:20 241
18 01:25 173
19 01:30 169
20 01:35 233
21 01:40 279
22 01:45 303
23 01:50 328
24 01:55 313
25 02:00 319
26 02:05 319
27 02:10 280
28 02:15 280
29 02:20 307
30 02:25 293
31 02:30 289
32 02:35 301
33 02:40 249
34 02:45 304
35 02:50 273
36 02:55 277
37 03:00 301
38 03:05 249
39 03:10 211
40 03:15 234
41 03:20 241
42 03:25 278
43 03:30 304
44 03:35 273
45 03:40 277
46 03:45 307
47 03:50 229
48 03:55 304
49 04:00 271

OBS	TIME	MSU/Hr
1	00:00	220
2	00:05	259
3	00:10	278
4	00:15	262
5	00:20	312
6	00:25	225
7	00:30	234
8	00:35	289
9	00:40	285
10	00:45	262
11	00:50	283
12	00:55	310
13	01:00	302
14	01:05	289
15	01:10	263
16	01:15	213
17	01:20	241
18	01:25	173
19	01:30	169
20	01:35	233
21	01:40	279
22	01:45	303
23	01:50	328
24	01:55	313
25	02:00	319
26	02:05	319
27	02:10	280
28	02:15	280
29	02:20	307
30	02:25	293
31	02:30	289
32	02:35	301
33	02:40	249
34	02:45	304
35	02:50	273
36	02:55	277
37	03:00	301
38	03:05	249
39	03:10	211
40	03:15	234
41	03:20	241
42	03:25	278
43	03:30	304
44	03:35	273
45	03:40	277
46	03:45	307
47	03:50	229
48	03:55	304
49	04:00	271