Limited supportBMC provides limited support for this version of the product. As a result, BMC no longer accepts comments in this space. If you encounter problems with the product version or the space, contact BMC Support.BMC recommends upgrading to the latest version of the product. To see documentation for that version, see BMC AMI Ops Monitor for CMF 6.3.

Cache Device Activity Report

This report is produced by the CACHEACT Analyzer control statement when REPORT=DEVICE is specified.

By default, the report is ordered by subsystem ID/device ID, but the order can be changed by the ORDER= parameter. The report can be filtered by model, subsystem ID, device ID, and a threshold value. Specific subsystems or devices can be selected or excluded.

The following figure shows an example of the Cache Device Activity Report. Depending on your level of PTF maintenance, select one of the following tabs:

 PRODUCED BY CMF ANALYZER (V.R.MM  PUT *UNK*)         CACHE DEVICE ACTIVITY REPORT                       RPTSEQ     3 PAGE      6
BMC Software, Inc.                                         BMC SOFTWARE, INC.                           REPORT DATE: 01 JAN 20 12.00
ACTL 16 DEC 19 21.35.29  17 DEC 19 18.30.00                   HOUSTON, TX.                              SYSTEM ID: SJSC     Z 2.04.0


BASED ON REC TYPE/# RECS/# SAMPLES/REC HOURS:  74-5/9,520/0/20.91
-------------- SUBSYSTEM ID: 0BC0   CONTROL UNIT: 0BCD   MODEL: 2107-921   MFR: EMC   PLANT: 09   SERIAL: 0000000AWDKL -------------

   SUBSYSTEM STORAGE       NON-VOLATILE STORAGE        S U B S Y S T E M     S T A T U S         I/O TOTALS              HIT %
----------------------  -------------------------   ---------------------------------------   ----------------      ----------------
CONFIGURED       366GB  CONFIGURED          192MB   NON-VOLATILE STORAGE - ACTIVE             CACHE    618,798      CACHE       97.9
AVAILABLE        366GB  PINNED                  0   CACHE FAST WRITE     - DEACTIVATED        TOTAL    618,798      TOTAL       97.9
PINNED               0
OFFLINE              0

CACHE I/O    -------------READ I/O REQUESTS-------------     ----------------------WRITE I/O REQUESTS----------------------       %
REQUESTS       COUNT     RATE      HITS     RATE   HIT %       COUNT     RATE      FAST     RATE       HITS    RATE   HIT %     READ

NORMAL       404,180      5.4   404,107      5.4   100.0     189,304      2.5   189,304      2.5    189,303     2.5   100.0     68.1
SEQUENTIAL    25,314      0.3    12,656      0.2    50.0           0        0         0        0          0       0       0    100.0
CFW DATA           0        0         0        0       0           0        0         0        0          0       0       0        0

TOTAL        429,494      5.7   416,763      5.5    97.0     189,304      2.5   189,304      2.5    189,303     2.5   100.0     69.4

-----------------------CACHE MISSES-----------------------            ------------MISC------------
REQUESTS      READ    RATE   WRITE    RATE  TRACKS    RATE                            COUNT   RATE

NORMAL          73       0       1       0       0       0            DELAYED NVS         0      0
SEQUENTIAL  12,658     0.2       0       0       4       0            DELAYED CACHE       0      0
CFW DATA         0       0       0       0                            DFW INHIBIT         0      0
                                                                       ASYNC (TRKS)   15,452    0.2
TOTAL CACHE MISSES   12,732   RATE    0.17
TOTAL CACHE HITS    618,798   RATE    8.23                            --------DISK ACTIVITY-------         --HOST ADAPTER ACTIVITY--
                                                                               RESP   BYTES  BYTES                     BYTES   BYTES
---CKD STATISTICS---     ---RECORD CACHING---                                  TIME    /REQ   /SEC                      /REQ    /SEC
                                                                      READ        0       0      0         READ        3,963  22,629
WRITE          1,052     READ MISSES        0                         WRITE       0       0      0         WRITE       4,127  10,386
WRITE HITS     1,052     WRITE PROM         0
PRODUCED BY CMF ANALYZER (V.R.MM  PUT *UNK*)         CACHE DEVICE ACTIVITY REPORT                       RPTSEQ     3 PAGE      7
BMC Software, Inc.                                              BCM1409                                 REPORT DATE: 01 JAN 20 12.00
ACTL 16 DEC 19 21.35.29  17 DEC 19 18.30.00             z/OS 2.4 Cache Activity                         SYSTEM ID: SJSC     Z 2.04.0


BASED ON REC TYPE/# RECS/# SAMPLES/REC HOURS:  74-5/9,520/0/20.91
VOLSER: AFXBC0   DEVICE: 00BC0   XTNT POOL: 0000   SUBSYSTEM ID: 0BC0   MODEL: 2107-921  MFR: EMC   PLANT: 09   SERIAL: 0000000AWDKL

     C A C H E    S T A T U S                      I/O TOTALS            HIT %
-------------------------------------------     -----------------   ----------------
DASD FAST WRITE - ACTIVE                        CACHE       1,044   CACHE       66.5
PINNED DATA     - NONE                          TOTAL       1,044   TOTAL       66.5

CACHE I/O    -------------READ I/O REQUESTS-------------     ----------------------WRITE I/O REQUESTS----------------------       %
REQUESTS       COUNT     RATE      HITS     RATE   HIT %       COUNT     RATE      FAST     RATE       HITS    RATE   HIT %     READ

NORMAL           344        0       344        0   100.0           0        0         0        0          0       0       0    100.0
SEQUENTIAL       700        0       350        0    50.0           0        0         0        0          0       0       0    100.0
CFW DATA           0        0         0        0       0           0        0         0        0          0       0       0        0

TOTAL          1,044        0       694        0    66.5           0        0         0        0          0       0       0    100.0

-----------------------CACHE MISSES-----------------------            ------------MISC------------
REQUESTS      READ    RATE   WRITE    RATE  TRACKS    RATE                            COUNT   RATE

NORMAL           0       0       0       0       0       0            DELAYED NVS         0      0
SEQUENTIAL     350       0       0       0       0       0            DELAYED CACHE       0      0
CFW DATA         0       0       0       0                            DFW INHIBIT         0      0
                                                                      ASYNC (TRKS)        0      0
                                                                      ASYNC (TRKS)        0      0
TOTAL CACHE MISSES      350   RATE       0
TOTAL CACHE HITS      1,044   RATE    0.01                            --------DISK ACTIVITY-------         --HOST ADAPTER ACTIVITY--
                                                                               RESP   BYTES  BYTES                     BYTES   BYTES
---CKD STATISTICS---     ---RECORD CACHING---                                  TIME    /REQ   /SEC                      /REQ    /SEC
                                                                      READ        0       0      0         READ        2,260      31
WRITE             27     READ MISSES        0                         WRITE       0       0      0         WRITE           0       0
WRITE HITS        27     WRITE PROM         0
PRODUCED BY CMF ANALYZER (v.r.mm  RSL yymm )                    CACHE DEVICE ACTIVITY REPORT                       RPTSEQ     5 PAGE     35    
BMC SOFTWARE, INC.                                        BMC SOFTWARE, INC.                            REPORT DATE: DD MMM YY 16.44
REQD 10 JUN YY 09.50.00  10 JUN YY 10.20.00                  HOUSTON, TX.                               SYSTEM ID: SJSE     Z v.rr.n
ACTL 10 JUN YY 09.50.00  10 JUN YY 10.20.00                                                             REPORT CYCLE: CYCLE099      

BASED ON REC TYPE/# RECS/# SAMPLES/REC HOURS:  74-5/24/0/0.5                                                                        
-------------- SUBSYSTEM ID: 0027   MODEL: 3990-03   Control UNIT: 5590   MFR: MCD   PLANT: 01   SERIAL: 00000131278E---------------

   SUBSYSTEM STORAGE       NON-VOLATILE STORAGE        S U B S Y S T E M     S T A T U S         I/O TOTALS              HIT %      
----------------------  -------------------------   ---------------------------------------   ----------------      ----------------
CONFIGURED         1GB  CONFIGURED          8.2MB   CACHING              - ACTIVE             CACHE        782      CACHE       99.9
AVAILABLE          1GB  PINNED                  0   NON-VOLATILE STORAGE - ACTIVE             OFFLINE        0      TOTAL       99.9
PINNED               0                              CACHE FAST WRITE     - ACTIVE             NONCACHE       0                      
OFFLINE              0                              IML DEVICE AVAILABLE - YES                TOTAL        782                      

CACHE I/O    -------------READ I/O REQUESTS-------------     ----------------------WRITE I/O REQUESTS----------------------       %
REQUESTS       COUNT     RATE      HITS     RATE   HIT %       COUNT     RATE      FAST     RATE       HITS    RATE   HIT %     READ

NORMAL           782      0.4       781      0.4    99.9           0        0         0        0          0       0       0    100.0
SEQUENTIAL         0        0         0        0       0           0        0         0        0          0       0       0        0
CFW DATA           0        0         0        0       0           0        0         0        0          0       0       0        0

TOTAL            782      0.4       781      0.4    99.9           0        0         0        0          0       0       0    100.0

-----------------------CACHE MISSES-----------------------            ------------MISC------------          ------NON-CACHE I/O-----
REQUESTS      READ    RATE   WRITE    RATE  TRACKS    RATE                            COUNT   RATE                      COUNT   RATE

NORMAL           1       0       0       0       1       0            DFW BYPASS          0      0          ICL             0      0
SEQUENTIAL       0       0       0       0       0       0            CFW BYPASS          0      0          BYPASS          0      0
CFW DATA         0       0       0       0                            DFW INHIBIT         0      0                                  
                                                                      ASYNC (TRKS)        0      0          TOTAL           0      0
TOTAL CACHE MISSES        1   RATE       0                                                                                          
TOTAL CACHE HITS     14,555   RATE    8.09                            --------DISK ACTIVITY-------         --HOST ADAPTER ACTIVITY--
                                                                               RESP   BYTES  BYTES                     BYTES   BYTES
---CKD STATISTICS---     ---RECORD CACHING---                                  TIME    /REQ   /SEC                      /REQ    /SEC
                                                                      READ   ------  ------  -----         READ       ------   -----
WRITE              0     READ MISSES        0                         WRITE  ------  ------  -----         WRITE      ------   -----
WRITE HITS         0     WRITE PROM         0  

PRODUCED BY CMF ANALYZER (v.r.mm  RSL yymm )                    CACHE DEVICE ACTIVITY REPORT                       RPTSEQ     5 PAGE    710    
BMC SOFTWARE, INC.                                        BMC SOFTWARE, INC.                            REPORT DATE: DD MMM YY 16.44
REQD 10 JUN YY 09.50.00  10 JUN YY 10.20.00                  HOUSTON, TX.                               SYSTEM ID: SJSE     Z v.rr.n
ACTL 10 JUN YY 09.50.00  10 JUN YY 10.20.00                                                             REPORT CYCLE: CYCLE099      

BASED ON REC TYPE/# RECS/# SAMPLES/REC HOURS:  74-5/24/0/0.5                                                                        

--------------- VOLSER: APD28G    DEVICE NUMBER: A300     RAID RANK: 99    SUBSYSTEM ID: A300    MODEL: 2105-20 --------------------

      C A C H E    S T A T U S                      D U P L E X    S T A T U S                      I/O TOTALS            HIT %     
-------------------------------------------     --------------------------------------------    -----------------   ----------------
CACHING         - ACTIVE                        DUPLEX PAIR      - NOT ESTABLISHED              CACHE       1,625   CACHE      100.0
DASD FAST WRITE - ACTIVE                        STATUS           - N/A                          OFFLINE         0   TOTAL      100.0
PINNED DATA     - NONE                          DUAL COPY VOLUME - N/A                          TOTAL       1,625                   

CACHE I/O    -------------READ I/O REQUESTS-------------     ----------------------WRITE I/O REQUESTS----------------------       %
REQUESTS       COUNT     RATE      HITS     RATE   HIT %       COUNT     RATE      FAST     RATE       HITS    RATE   HIT %     READ

NORMAL            47        0        47        0   100.0           1        0         1        0          1       0   100.0     97.9
SEQUENTIAL         0        0         0        0       0       1,577      0.9     1,577      0.9      1,577     0.9   100.0        0
CFW DATA           0        0         0        0       0           0        0         0        0          0       0       0        0

TOTAL             47        0        47        0   100.0       1,578      0.9     1,578      0.9      1,578     0.9   100.0      2.9

-----------------------CACHE MISSES-----------------------            ------------MISC------------          ------NON-CACHE I/O-----
REQUESTS      READ    RATE   WRITE    RATE  TRACKS    RATE                            COUNT   RATE                      COUNT   RATE

NORMAL           0       0       0       0       2       0            DFW BYPASS          0      0          ICL             0      0
SEQUENTIAL       0       0       0       0       0       0            CFW BYPASS          0      0          BYPASS          0      0
CFW DATA         0       0       0       0                            DFW INHIBIT         0      0                                  
                                                                      ASYNC (TRKS)    1,583    0.9          TOTAL           0      0
TOTAL CACHE MISSES        0   RATE       0                                                                                          
TOTAL CACHE HITS      1,625   RATE    0.90                                                                                          

---CKD STATISTICS---     ---RECORD CACHING---                                                                                       

WRITE              0     READ MISSES        0

Cache Device Activity Report field descriptions

The Cache Device Activity Report consists of the following sections and fields:

  • The first page, for each subsystem, is the same as the first page of the Cache Subsystem Activity report. The fields in that report are described in Cache Subsystem Activity Report field descriptions.
  • The following pages, for each subsystem, contain device detail information, one page per device, for each device in the subsystem. This page consists of two sections: a status section and an activity section. The activity section uses the same format as the first page of the Cache Subsystem Activity Report, except that it is for activity that is specific to the device.

The following table describes the fields in the status section of the Cache Device Activity Report. Depending on your level of PTF maintenance, select one of the following tabs:

Field

Description

Subsystem Status section

SUBSYSTEM ID

Physical control unit number of the cache subsystem

MODEL

Hardware model ID

Control UNIT

Physical control unit number of the caching subsystem; this number is equal to the lowest device number for the subsystem

MFR

Manufacturer code of the cache subsystem

PLANT

Plant code of the cache subsystem

SERIAL

Serial number of the cache subsystem

SUBSYSTEM STORAGE

Cache storage status, in megabytes:

  • CONFIGURED—amount installed
  • AVAILABLE—amount available
  • PINNED—amount pinned in cache - DASD failure prevents data destaging
  • OFFLINE—amount offline, possibly due to error

NON-VOLATILE STORAGE

Nonvolatile storage (NVS) status, in megabytes:

  • CONFIGURED—amount installed
  • PINNED—amount pinned in NVS - DASD failure prevents data destaging

SUBSYSTEM STATUS

Caching status of the entire subsystem:

NON-VOLATILE STORAGE

  • ACTIVE—NVS caching is online and usable
  • INTERNAL ERROR—internal error stopped NVS cache
  • HOST TERMINATION—host deactivated NVS caching
  • DFW SUSPENDED—DFW inhibited - battery failure
  • PENDING OFFLINE—NVS cache deactivation pending
  • IN MAINTENANCE—NVS disabled for maintenance
  • ?????—unknown status

CACHE FAST WRITE

  • ACTIVE—CFW is active
  • DEACTIVATED—CFW has been deactivated

I/O TOTALS

Number of I/O requests:

  • CACHE—cacheable I/O requests to cached devices
  • OFFLINE—I/O requests to non-cached devices
  • NONCACHE—sum of INHIBIT CACHE LOAD and CACHE BYPASS requests
  • TOTAL—sum of all I/O requests

HIT %

Cache hits, as percentages of all I/O requests:

  • CACHE—percentage of cacheable I/O requests that were serviced from cache
  • TOTAL—percentage of all I/O requests that were serviced from cache

Subsystem Details section

CACHE I/O REQUESTS

Specified by the DEFINE EXTENT command; categorizes the way cache is managed, as one of three classes:

  • NORMAL—use the normal LRU algorithm to make cache space available
  • SEQUENTIAL—preload of tracks from DASD for sequential I/O requests
  • CFW DATA—handle WRITE and READ-AFTER-WRITE requests in cache
  • TOTAL—totals or averages for the three defined classes

READ I/O REQUESTS

I/O requests that had at least one SEARCH or READ command and no WRITE command; only requests to cached devices are counted:

COUNT—total number of SEARCH/READ requests
RATE—SEARCH/READ requests per second
HITS—SEARCH/READ requests handled without accessing DASD
RATE—SEARCH/READ requests handled without accessing DASD, per second
HIT %—SEARCH/READ cache hits, as a percentage of all such requests

WRITE I/O REQUESTS

I/O requests that had at least one WRITE command; only requests to cached devices are counted:

  • COUNT—total number of WRITE requests
  • RATE—WRITE requests per second
  • FAST—CACHE/DASD FAST WRITE (CFW and DFW) requests
  • RATE—CFW/DFW requests per second
  • HITS—CFW/DFW requests handled without accessing DASD
  • RATE—CFW/DFW requests processed without accessing DASD, per second
  • HIT %—CFW/DFW cache hits, as a percentage of all WRITE requests

% READ

READ requests as a percentage of all READ and WRITE requests

CACHE MISSES

Occurs under the following situations:

  • Data to be read or written is not found in the cache. This problem causes the track or tracks containing the data to be read from DASD and placed in the cache.
  • A lack of NVS storage causes the data to be written to DASD immediately.
  • For some reason, DASD FAST WRITE (DFW) is inhibited.

Possible values are:

  • READ—SEARCH/READ requests that accessed DASD
  • RATE—SEARCH/READ requests that accessed DASD, per second
  • WRITE—WRITE requests that accessed DASD
  • RATE—WRITE requests that accessed DASD, per second
  • TRACKS—number of tracks transferred from DASD to cache
  • RATE—number of tracks transferred from DASD to cache, per second

MISC

Miscellaneous I/O requests

  • DELAYED DUE TO NVS—DASD Fast Write operations delayed due to non-volatile storage space constraints
  • DELAYED DUE TO CACHE—operations delayed due to cache space constraints
  • DFW INHIBIT
  • ASYNC (TRKS)

DFW INHIBIT

If DASD FAST WRITE (DFW) is active, the number of WRITE requests that inhibited DFW

If DFW is inactive, the number of WRITE requests that directly accessed the DASD is recorded in this field.

  • COUNT—total number of DFW INHIBIT requests
  • RATE—DFW INHIBIT requests per second

ASYNC (TRKS)

Number of tracks asynchronously transferred from cache to DASD, in order to free space in the cache and the NVS

For a duplex pair, this figure is the number of transfers from the primary cache to the secondary. A high number of ASYNC I/Os indicates an over-committed cache or NVS.

  • COUNT—number of tracks asynchronously transferred from cache to DASD
  • RATE—number of tracks asynchronously transferred, per second

ICL

Inhibit cache load (ICL)

Number of I/O requests that inhibited the loading of data into cache, even though the data was not found in the cache.

  • COUNT—total number of ICL requests
  • RATE—ICL requests per second

BYPASS

Number of I/O requests that explicitly bypassed the cache, whether or not the data was in the cache:

  • COUNT—total number of BYPASS requests
  • RATE—BYPASS requests per second

TOTAL

Total number of I/O requests that bypassed the cache:

  • COUNT—number of I/O requests that bypassed the cache
  • RATE—number of I/O requests that bypassed the cache, per second

TOTAL CACHE MISSES

Count and rate of I/O requests that were not serviced from cache

TOTAL CACHE HITS

Count and rate of I/O requests that were serviced from cache

SYNCH I/O ACTIVITY

Synchronous I/O activity for cache devices and subsystems

The report produces this section if the following conditions are met:

  • Synchronous I/O activity is detected in an interval
  • You request the Subsystem and Device reports

DISK ACTIVITY

Transfer activity from hard disk to cache and vice versa

This information is available only for 2107 and 1750 subsystems; for all other subsystems, dashes will print in place of the missing data.

HOST ADAPTER ACTIVITY

I/O activity of normal, sequential, and CFW read and write requests

This information is available only for 2107 and 1750 subsystems; for all other subsystems, dashes will print in place of the missing data.

RESP TIME

Response time in milliseconds per read and write request

BYTES/REQ

Average number of bytes transferred per read and write requests

BYTES/SEC

Average number of bytes transferred per second per read and write requests

CKD STATISTICS

Count-Key-Data (CKD) track format requests:

  • WRITE—number of CKD WRITE requests (also in total WRITE count)
  • WRITE HITS—CKD WRITE requests that were handled in cache

RECORD CACHING

Dynamic record caching counts; normally, only whole tracks are cached:

  • READ MISSES—count of records to be read that were not in the cache
  • WRITE PROM—count of records to be written that needed to access DASD

Field

Description

CACHE STATUS

CACHING

ACTIVE—Caching is active. I/O requests to the device can be handled in cache.

DEACTIVATION PENDING—Caching has been deactivated, but not all modified data has been transferred to DASD.

DEACTIVATED—Caching has been deactivated for this device.

DASD FAST WRITE

ACTIVE—DASD FAST WRITE (DFW) I/O requests to the device can be processed.

DEACTIVATE PENDING—DASD FAST WRITE has been stopped, but not all modified data has been transferred to DASD.

DEACTIVATED—DASD FAST WRITE has been stopped for this device.

PINNED DATA

NONE—No data is pinned for this device.

EXISTS - DFW SUSPENDED—Pinned data is present, and DASD FAST WRITE has been suspended.

EXISTS - DFW ACTIVE—Pinned data is present, but DASD FAST WRITE has not been suspended.

DUPLEX STATUS

DUPLEX PAIR

NOT ESTABLISHED—The device is not part of a duplex pair.

ACTIVE—The device is active as the primary or secondary of a duplex pair.

PENDING—The device is part of a duplex pair being established.

SUSPENDED—The duplexing has been suspended due to an error in one or the other device of the duplex pair.

STATUS

N/A—The device is not part of a duplex pair.

PRIMARY—The device is the primary device of a duplex pair.

SECONDARY—The device is the secondary device of a duplex pair.

DUAL COPY VOLUME

N/A—The device is not part of a duplex pair.

nnnn—Indicates the device address of the other device that is part of the duplex pair.

I/O TOTALS

CACHE

This value is the number of cacheable I/O requests to the device.

OFFLINE

This value is the number of noncacheable I/O requests to the device.

TOTAL

This value is the number of I/O requests to the device.

HIT %

CACHE

This value is the number of cache hits, as percentages of all cacheable I/O requests.

TOTAL

This value is the number of cache hits, as percentages of all I/O requests.


Related topics

CACHE
CACHEACT
Cache-reports

 

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