Cache Subsystem Activity Report
This report is produced by the CACHEACT Analyzer control statement when REPORT=SUBSYS is specified.
By default, the report is ordered by subsystem ID, but the order can be changed by the ORDER= parameter. The report can be filtered by model, subsystem ID, and a threshold value. Specific subsystems can be selected or excluded.
The following figure shows an example of the Cache Subsystem Activity Report.
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: A300 MODEL: 2105-20 Control UNIT: A333 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 4.1GB CONFIGURED 192MB CACHING - ACTIVE CACHE 14,555 CACHE 100.0
AVAILABLE 3.4GB PINNED 0 NON-VOLATILE STORAGE - ACTIVE OFFLINE 0 TOTAL 100.0
PINNED 0 CACHE FAST WRITE - ACTIVE NONCACHE 0
OFFLINE 0 IML DEVICE AVAILABLE - YES TOTAL 14,555
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 4,851 2.7 4,851 2.7 100.0 223 0.1 223 0.1 223 0.1 100.0 95.6
SEQUENTIAL 442 0.2 437 0.2 98.9 9,039 5.0 9,039 5.0 9,039 5.0 100.0 4.7
CFW DATA 0 0 0 0 0 0 0 0 0 0 0 0 0
TOTAL 5,293 2.9 5,288 2.9 99.9 9,262 5.1 9,262 5.1 9,262 5.1 100.0 36.4
-----------------------CACHE MISSES----------------------- ------------MISC------------ ------NON-CACHE I/O-----
REQUESTS READ RATE WRITE RATE TRACKS RATE COUNT RATE COUNT RATE
NORMAL 0 0 0 0 3 0 DFW BYPASS 0 0 ICL 0 0
SEQUENTIAL 5 0 0 0 463 0.3 CFW BYPASS 0 0 BYPASS 0 0
CFW DATA 0 0 0 0 DFW INHIBIT 0 0
ASYNC (TRKS) 2,480 1.4 TOTAL 0 0
TOTAL CACHE MISSES 5 RATE 0
TOTAL CACHE HITS 14,555 RATE 8.09 -SYNCH I/O ACTIVITY- --------DISK ACTIVITY------- --HOST ADAPTER ACTIVITY--
REQ HIT RESP BYTES BYTES BYTES BYTES
---CKD STATISTICS--- ---RECORD CACHING--- /SEC % TIME /REQ /SEC /REQ /SEC
READ 847.8 99.6 READ ------ ------ ----- READ ------ -----
WRITE 0 READ MISSES 0 WRITE 0 0 WRITE ------ ------ ----- WRITE ------ -----
WRITE HITS 0 WRITE PROM 7,746
PRODUCED BY CMF ANALYZER (v.r.mm RSL yymm ) CACHE SUBSYSTEM ACTIVITY REPORT RPTSEQ 4 PAGE 29
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: A300 MODEL: 2105-20 Control UNIT: A333 --------------------------------------
DEV VOLUME RRID ----STATUS--- % I/O -CACHE HIT RATE- --------DASD I/O RATE-------- ASYNC -------% HITS------ %
NUM SERIAL CACHE DASDFW I/O RATE READ DFW CFW STAGE DFWBP ICL BYP OTHER RATE TOTAL READ WRITE READ
---- ------ ---- ------ ------ ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
A3000 APD28G ACTIVE ACTIVE 11.2 0.9 0 0.9 0 0 0 0 0 0 0.9 100.0 100.0 100.0 2.9
A3001 SMFT01 ACTIVE ACTIVE 0.4 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
A3002 SMFT02 ACTIVE ACTIVE 0.4 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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A3003 SMFT03 0100 ACTIVE ACTIVE 22.5 1.8 0 1.8 0 0 0 0 0 0 0.2 100.0 100.0 100.0 2.2
A3013 SMFT28 0100 ACTIVE ACTIVE 0.4 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
A306F -A036F 0101 ACTIVE ACTIVE 0.1 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
TOTALS FOR 112 DEVICES: 100.0 8.1 2.9 5.1 0 0 0 0 0 0 2.8 100.0 99.9 100.0 36.4
----------------------------------------------------- RAID RANK ACTIVITY -----------------------------------------------------------
---------READ REQUESTS--------- --------WRITE REQUESTS---------
ID TYPE DA HDD COUNT RATE AVG SZ BYTE/S RTIME COUNT RATE AVG SZ BYTE/S RTIME ------ HIGHEST ACTIVITY VOLUMES--------
---- ------- -- --- ----- ----- ------ ------ ----- ----- ----- ------ ------ -----
0100 RAID-5 11 7 39 0 53.1K 1,151 4 139 0.1 76.3K 5,899 26 FTP109 SMFT03 APD28G PAGC32 FTP103
0101 RAID-5 11 7 101 0.1 38.3K 2,150 10 0 0 0 0 0 --A34E FTP111 FTP112 --A338 --A339
TOTAL 14 140 0.1 42.4K 3,301 8 139 0.1 76.3K 5,899 26
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: A300 MODEL: 2105-20 Control UNIT: A333 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 4.1GB CONFIGURED 192MB CACHING - ACTIVE CACHE 14,555 CACHE 100.0
AVAILABLE 3.4GB PINNED 0 NON-VOLATILE STORAGE - ACTIVE OFFLINE 0 TOTAL 100.0
PINNED 0 CACHE FAST WRITE - ACTIVE NONCACHE 0
OFFLINE 0 IML DEVICE AVAILABLE - YES TOTAL 14,555
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 4,851 2.7 4,851 2.7 100.0 223 0.1 223 0.1 223 0.1 100.0 95.6
SEQUENTIAL 442 0.2 437 0.2 98.9 9,039 5.0 9,039 5.0 9,039 5.0 100.0 4.7
CFW DATA 0 0 0 0 0 0 0 0 0 0 0 0 0
TOTAL 5,293 2.9 5,288 2.9 99.9 9,262 5.1 9,262 5.1 9,262 5.1 100.0 36.4
-----------------------CACHE MISSES----------------------- ------------MISC------------ ------NON-CACHE I/O-----
REQUESTS READ RATE WRITE RATE TRACKS RATE COUNT RATE COUNT RATE
NORMAL 0 0 0 0 3 0 DFW BYPASS 0 0 ICL 0 0
SEQUENTIAL 5 0 0 0 463 0.3 CFW BYPASS 0 0 BYPASS 0 0
CFW DATA 0 0 0 0 DFW INHIBIT 0 0
ASYNC (TRKS) 2,480 1.4 TOTAL 0 0
TOTAL CACHE MISSES 5 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 7,746
PRODUCED BY CMF ANALYZER (v.r.mm RSL yymm ) CACHE SUBSYSTEM ACTIVITY REPORT RPTSEQ 4 PAGE 29
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: A300 MODEL: 2105-20 Control UNIT: A333 --------------------------------------
DEV VOLUME RRID ----STATUS--- % I/O -CACHE HIT RATE- --------DASD I/O RATE-------- ASYNC -------% HITS------ %
NUM SERIAL CACHE DASDFW I/O RATE READ DFW CFW STAGE DFWBP ICL BYP OTHER RATE TOTAL READ WRITE READ
---- ------ ---- ------ ------ ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
A3000 APD28G ACTIVE ACTIVE 11.2 0.9 0 0.9 0 0 0 0 0 0 0.9 100.0 100.0 100.0 2.9
A3001 SMFT01 ACTIVE ACTIVE 0.4 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
A3002 SMFT02 ACTIVE ACTIVE 0.4 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
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A3003 SMFT03 0100 ACTIVE ACTIVE 22.5 1.8 0 1.8 0 0 0 0 0 0 0.2 100.0 100.0 100.0 2.2
A3013 SMFT28 0100 ACTIVE ACTIVE 0.4 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
A306F -A036F 0101 ACTIVE ACTIVE 0.1 0 0 0 0 0 0 0 0 0 0 100.0 100.0 0 100.0
TOTALS FOR 112 DEVICES: 100.0 8.1 2.9 5.1 0 0 0 0 0 0 2.8 100.0 99.9 100.0 36.4
----------------------------------------------------- RAID RANK ACTIVITY -----------------------------------------------------------
---------READ REQUESTS--------- --------WRITE REQUESTS---------
ID TYPE DA HDD COUNT RATE AVG SZ BYTE/S RTIME COUNT RATE AVG SZ BYTE/S RTIME ------ HIGHEST ACTIVITY VOLUMES--------
---- ------- -- --- ----- ----- ------ ------ ----- ----- ----- ------ ------ -----
0100 RAID-5 11 7 39 0 53.1K 1,151 4 139 0.1 76.3K 5,899 26 FTP109 SMFT03 APD28G PAGC32 FTP103
0101 RAID-5 11 7 101 0.1 38.3K 2,150 10 0 0 0 0 0 --A34E FTP111 FTP112 --A338 --A339
TOTAL 14 140 0.1 42.4K 3,301 8 139 0.1 76.3K 5,899 26
Cache Subsystem Activity Report field descriptions
The following table describes the fields in the Cache Subsystem Activity Report.
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:
| |
NON-VOLATILE STORAGE | Nonvolatile storage (NVS) status, in megabytes:
| |
SUBSYSTEM STATUS | Caching status of the entire subsystem: CACHING
NON-VOLATILE STORAGE
CACHE FAST WRITE
IML DEVICE AVAILABLE
| |
I/O TOTALS | Number of I/O requests:
| |
HIT % | Cache hits, as percentages of all I/O requests:
| |
Subsystem Details section | ||
CACHE I/O REQUESTS | Specified by the DEFINE EXTENT command; categorizes the way cache is managed, as one of three 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:
| |
WRITE I/O REQUESTS | I/O requests that had at least one WRITE command; only requests to cached devices are counted:
| |
% READ | READ requests as a percentage of all READ and WRITE requests | |
CACHE MISSES | Occurs under the following situations:
Possible values are:
| |
MISC | Miscellaneous I/O requests | |
DFW BYPASS | Number of DASD FAST WRITE (DFW) requests that might have been written to NVS, except that NVS was over-committed. This situation forced the writes to be sent directly to DASD.
| |
CFW BYPASS | Number of I/O requests with the CACHE FAST WRITE (CFW) attribute that went directly to DASD because the cache was full. No waiting for destaging is done for these requests.
| |
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.
| |
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.
| |
NON-CACHE I/O | I/O requests that bypass the cache | |
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.
| |
BYPASS | Number of I/O requests that explicitly bypassed the cache, whether or not the data was in the cache:
| |
TOTAL | Total number of I/O requests that bypassed the cache:
| |
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 (PTF BQM1573 applied) | Synchronous I/O activity for cache devices and subsystems The report produces this section if the following conditions are met:
| |
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:
| |
RECORD CACHING | Dynamic record caching counts; normally, only whole tracks are cached:
| |
Device Overview section | ||
DEV NUM | Five-digit device number that uniquely identifies the DASD device | |
VOLUME SERIAL | Volume serial number | |
XTNT POOL or RRID | ID of the extent pool to which the device belongs (for 2107s and 1750s only) RAID rank identifier (for systems other than 2107s and 1750s) | |
STATUS | Cache status of the DASD device:
| |
% I/O | I/O requests to this DASD volume, as a percentage of all I/O requests to the cache subsystem to which it belongs | |
I/O RATE | I/O requests per second to the volume | |
CACHE HIT RATE | I/O requests per second that completed without accessing DASD, by request type:
| |
DASD I/O RATE | I/O requests per second that accessed DASD, by request type:
| |
ASYNC RATE | Number of tracks asynchronously written to the DASD device in order to release space in the cache or NVS storage. A high rate indicates that storage might be over-committed. | |
% HITS | I/O requests serviced from the cache, as percentages of all I/O requests | |
TOTAL | Percentage of READ and WRITE requests that were serviced from the cache | |
READ | Percentage of READ requests that were serviced from the cache | |
WRITE | Percentage of WRITE requests that were serviced from the cache | |
READ | READ requests as a percentage of all I/O requests | |
RAID Rank Activity section (printed only for 2105 subsystems) | ||
ID | RAID rank identifier | |
TYPE | RAID rank type | |
DA | Device adapter identifier | |
HDD | Number of hard disk drives (HDD) in the RAID rank | |
READ REQUESTS | READ I/O requests:
| |
WRITE REQUESTS | WRITE I/O requests:
| |
HIGHEST ACTIVITY VOLUMES | Top five volumes sorted in descending order by I/O activity |
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