We too have had issues in the past with "high CPU" in ANTMAIN, although generated by DFDSS COPY rather than BMC utilities, but the root issue could be similar, or the same. The problem for us was eventually narrowed down to specifically occurring when allocations were targetting (in our case) SMS storage groups with 'considerable' numbers of volumes (best part of a thousand). We opened a a PMR for this, and we got the info back that for every dataset allocation, SMS passes each eligible volume to SDM so it can check for flashcopy eligibility (which in our case was not appropriate because we didnt have any flashcopy capable devices - but the DFDSS default is to allow flashcopy [aka FASTREP in DFDSS terms]). So the ANTMAIN CPU burn is largely to do with SMS passing the volumes one by one to SDM for every single allocation, and SDM checking flashcopy eligibilty/parings for each volume.
We get round this in our case, by specifying FASTREP(NONE) in DFDSS COPY sysin, to prevent this situation from occurring. So if you a) have lots of target volumes, and b) the BMC utility facilitates some sort of flashcopy support then you could be experiencing a similar issue. If you can totally turn off flashcopy being invoked within BMC (even i you dont have flashcopy capability, like us), that may help the problem go away. There was a marketing requirement raised on the back of our PMR (MR0719125224) suggesting some semblance of caching being done of the flashcopy eligibilty/pairing info for each volume as it is encountered (instead of having to look it up afresh for every allocation!), but the PMR was closed before any feedback was given on that. Perhaps some helpful IBMer could look up the status of that? HTH On 9 May 2013 17:22, John Eells <ee...@us.ibm.com> wrote: > The DFSMS copy services folk who own ANTMAIN would be interested in > knowing more if you'd like to open a PMR... > > > Sheldon Davis wrote: > >> We are using BMCto take an instant snapshot of about nine hundred tables. >> The BMC XBM takes a lot of CPU and the Copy Services started task ANTMAIN >> also takes a lot of CPU >> Both these stc's have a higher priority than our CICS. >> Has anyone else experienced this problem? >> we use Z/OS version 1.13 >> > > > -- > John Eells > z/OS Technical Marketing > IBM Poughkeepsie > ee...@us.ibm.com > > > ------------------------------**------------------------------**---------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
