You have to normalize the metrics to be in the same units. For the RCA structure some are in 128 microseconds and some are in 1024 microseconds. Other data metrics can be in other units as well. You can't assume they are all in microseconds :) It gets pretty tricky esp. historical data when the metrics change over time.
On Sat, Nov 26, 2022 at 6:48 PM Boesel Guillaume <[email protected]> wrote: > Hi, > Is somebody know how to calculate the average dasd response time from WLM > Period's connect/disconnect/wait/iosq times ? > > On my shop, we use SYSVIEW. In his option WLM, we can see the I/O metrics > but I don't understand how is calculated the average response time. > > For the example, how is calculated the 0.022968 second average connect > time ? I thought that it was simply the amount of connect time in > microseconds divided by the total I/O count, but 3527936 / 19661 = 179.4382 > that is far away of 22968 microseconds (0.022968 seconds)... > > SYSVIEW, option WLM for a particular WLM Period : > Resource Value Average > Total service units for period 82495 > CPU service units 77274 > SRB service units 5221 > Swap count 6 > I/O interupt time 0.044067 > Average swapped-in transactions 0 > Total frames 0 > RCT time 0.001301 > Average active transactions 0 > DASD I/O count 19661 > DASD I/O connect time 3.527936 0.022968 > DASD I/O disconnect time 1.666304 0.010848 > DASD I/O wait time 0.000896 0.000006 > > > In the RCAERESC structure of IWMWRCAA mapping, it's mentionned that the > Total DASD I/O count "can be used with fields RCAEIOCT, RCAEIODT, RCAEIOWT, > RCAEIOST to determine average DASD response time for the period" but > without more details. > > > https://www.ibm.com/docs/en/zos/2.5.0?topic=SSLTBW_2.5.0/com.ibm.zos.v2r5.iead300/IWMWRCAA-map.html > > Thanks for your help to understand this calculation. > > Regards > Guillaume > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
