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This report produces a tabular listing of cache usage on
3880-23 and 3990-3 control units by VOLSER for the duration
of the period specified in the run-time execution parameters.
The report is in two formats: one for 3880-23 controllers,
and one for 3990-3 controllers. These are identified by the
report titles.
INTENDED USE:
For analysis of cache usage in terms of how much activity
is directed to cache VOLSERs; whether transfers to and
from DASD are being avoided by using cache; and what
percentage of bytes read are from cache, from DASD
bypassing cache, and from DASD due to read misses. This
report can be used to detect when cache is being utilized
inefficiently, and for monitoring changes to the cache
environment.
FORMAT 3880-23 Control Units:
A tabular report, in ascending order, of device address
where each column represents a different measurement
associated with a given VOLSER:
READ HIT RATIO - The ratio of the sum of all "search
and read normal" and "search and read sequential"
requests that were satisfied from cache to the total
number of read requests to the volume.
WRITE/READ RATIO - The ratio of the sum of all "write
normal" and "write sequential" requests to the sum of
all "search and read normal" and "search and read
sequential" requests.
READ REQUESTS - The sum of all "search and read
normal" and "search and read sequential" requests to
the volume.
WRITE REQUESTS - the sum of all "write normal" and
"write sequential" requests.
PCT OF DASD READ CACHE - The percentage of all bytes
transferred from this VOLSER that were transferred
from cache to the channel without DASD access.
PCT OF DASD READ DASD - The percentage of all bytes
transferred from this VOLSER that were transferred
from DASD to cache to the channel due to read misses.
PCT OF DASD READ BYPASS - The percentage of all bytes
transferred from this VOLSER that were transferred
from DASD to the channel, bypassing cache access.
An example of this report is shown in Figures 3-19 and
3-20.
INQUIRY ID:
Tabular Report: VMXTXB
DATA SOURCE (File/Timespan):
VMXCDI01 - DETAIL
DATA ELEMENTS USED:
VMXDVSID - Host Subchannel ID
CDISDID - Storage Director Identification
CDICUTYP - Control Unit Type
CDIOCSTA - Overall Caching Status
CDICAPAV - Available Subsystem Storage Capacity
CDICAPOF - Offline Subsystem Storage Capacity
CDISRNRQ - Search and Read Normal Requests
CDISRSRQ - Search and Read Sequential Requests
CDISRNRH - Search and Read Normal Request Hits
CDISRSRH - Search and Read Sequential Request Hits
CDIWNRQ - Write Normal Requests
CDIWSQRQ - Write Sequential Requests
CDIDACBX - Bytes Transferred From DASD To Channel
CDICACBX - Bytes Transferred From Cache To Channel
CDIDCCBX - Bytes Xfr From DASD To Cache and Channel
CALCULATIONS:
A number of elements are calculated to produce this
report. They are as follows:
READREQ = CDISRNRQ + CDISRSRQ;
WRITEREQ = CDIWNRQ + CDIWSQRQ;
IF READREQ > 0 THEN DO;
RHRATIO = 100 * ((CDISRNRH + CDISRSRH) / READREQ);
WRRATIO = 100 * (WRITEREQ / READREQ);
END;
ELSE DO;
RHRATIO = 0;
WRRATIO = 0;
END;
BYTEXFRD = SUM(CDIDACBX,CDICACBX,CDIDCCBX);
IF BYTEXFRD > 0 THEN DO;
CACHE = 100 * (CDICACBX / BYTEXFRD);
DASD = 100 * (CDIDCCBX / BYTEXFRD);
BYPASS = 100 * (CDIDACBX / BYTESFRD);
END;
ELSE DO;
CACHE = 0; DASD = 0; BYPASS = 0;
END;
USAGE CONSIDERATIONS: None
------------------------------------------------------------------------------------------------------------------------------------ VM Cache Usage Detail Report CA Production Complex INQUIRY: VMXTXB RUN DATE: 14DECyy System: VMXA Date: 13DECyy CU Type: 3880-23 Stg Dir Id: 0E Device Id: 77 Device: 0977 Volume: MVSC1A ------------------------------------------------------------------------------------------------------------------------------------ Read Write Percent Of Read I/Os Overall Hit Read Read Write -------------------- Capacity Cache Stat Time Ratio Ratio Requests Requests Cache DASD Bypass Available <------------------> ------------------------------------------------------------------------------------------------------------------------------------ 8:45 86.27 0.00 51 0 77.83 22.17 0.00 414.87 ACT --- --- CU0 CU1 9:00 84.08 1.20 333 4 76.17 23.83 0.00 287.22 ACT --- --- CU0 CU1 9:15 94.06 59.58 522 311 93.84 6.12 0.05 319.13 ACT --- --- CU0 CU1 9:30 97.44 90.74 821 745 97.85 2.14 0.01 414.87 ACT --- --- CU0 CU1 9:45 99.29 98.40 564 555 99.80 0.14 0.06 351.05 ACT --- --- CU0 CU1 10:00 100.00 100.00 488 488 100.00 0.00 0.00 287.22 ACT --- --- CU0 CU1 10:15 99.06 92.94 425 395 99.77 0.20 0.02 382.96 ACT --- --- CU0 CU1 10:30 99.08 93.58 436 408 99.84 0.16 0.00 351.05 ACT --- --- CU0 CU1 10:45 100.00 95.69 418 400 100.00 0.00 0.00 351.05 ACT --- --- CU0 CU1 11:00 99.04 97.50 519 506 99.70 0.30 0.00 319.13 ACT --- --- CU0 CU1 11:15 99.78 99.56 457 455 99.99 0.01 0.00 287.22 ACT --- --- CU0 CU1 11:30 97.42 90.96 542 493 96.78 3.09 0.13 351.05 ACT --- --- CU0 CU1 11:45 100.00 106.36 393 418 100.00 0.00 0.00 319.13 ACT --- --- CU0 CU1 12:00 99.69 99.69 636 634 99.89 0.11 0.00 382.96 ACT --- --- CU0 CU1 ------------------------------------------------------------------------------------------------------------------------------------
Figure 3-19. Detail VMX 3880-23 Cache Usage Report (by Device)
------------------------------------------------------------------------------------------------------------------------------------ Detail VM Cache Usage Report CA Production Complex INQUIRY: VMXTXB RUN DATE: 14DECyy System: VMXA Date: 13DECyy CU Type: 3990-3 Subsystem Id: 10 Device Id: E0 Device: 08E0 Volume: XAP002 ----------------------------------------------------------------------------------------------------------------------------------- Basic DASD F/W Cache F/W < Capacity > < Status > R-Hit R-Wrt W-Hit Oflow R-Hit W-Hit < Cache > NVS < Cache > < NVS > < Device > Time <-- Ratio --> <Ratio Rate> <-- Ratio --> Available In Error In Error Act Err Act Err Act DFW Duplex Err Pin ----------------------------------------------------------------------------------------------------------------------------------- 8:45 76.32 0.05 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 9:00 23.19 0.09 0.00 0.00 0.00 0.00 444.28 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 9:15 27.17 0.22 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 9:30 68.39 0.48 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 9:45 80.62 0.39 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 10:00 35.21 0.09 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 10:15 45.95 0.12 0.00 0.00 0.00 0.00 444.28 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 10:30 30.43 0.02 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 10:45 19.44 0.05 0.00 0.00 0.00 0.00 444.28 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 11:00 20.00 0.01 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 11:15 35.00 0.03 0.00 0.00 0.00 0.00 380.81 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 11:30 37.07 0.19 0.00 0.00 0.00 0.00 476.02 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 11:45 56.44 0.37 0.00 0.00 0.00 0.00 444.28 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO 12:00 56.73 0.16 0.00 0.00 0.00 0.00 380.81 0.00 0.00 ACTV CFD DACT --- ACT DAC NO -- --- NO ------------------------------------------------------------------------------------------------------------------------------------
Figure 3-20. Detail VMX 3990-3 Cache Usage Report (by Device)
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