Correction: There are some cautionary statements about RESMIL=OFF regarding CPU consumption. Zero is different as GRS may still do tuning.
JG Joe Gentile z/OS GRS and Logger Development (845)435-2184 (T/L 295-2184) jwgen...@us.ibm.com ----- Forwarded by Joseph W Gentile/Poughkeepsie/IBM on 04/27/2014 09:14 PM ----- From: Joseph W Gentile/Poughkeepsie/IBM To: IBM-MAIN@LISTSERV.UA.EDU, Date: 04/27/2014 09:09 PM Subject: Re: GRS RESMIL setting on CPU consumption Hello, Based on the lack of warnings in the following page in the GRS Planning Guide ( http://pic.dhe.ibm.com/infocenter/zos/v2r1/index.jsp?topic=%2Fcom.ibm.zos.v2r1.ieag400%2Ftunring.htm ), and some customer experience, I don't think that RESMIL=0 or OFF will severely impact your CPU utilization. I'll run that by a colleague. Always best to try it in a test environment first of course. Ring mode performance for Global ENQs is still drastically slower in Ring mode than it is in Star. The following performance tools for ENQs (also documented in GRS Planning) could be helpful in addition to RMF Monitor III reports: SYS1.SAMPLIB(ISGNQRSP) - Measures Global ENQ performance GRS EQDQ Monitor, ISGAUDIT - Provides a more comprehensive look at ENQ data including performance, with some performance overhead Please check out the references attached to this email for more information about GRS performance. GRS Planning Guide: Ring info http://pic.dhe.ibm.com/infocenter/zos/v2r1/topic/com.ibm.zos.v2r1.ieag400/gring.htm http://pic.dhe.ibm.com/infocenter/zos/v2r1/topic/com.ibm.zos.v2r1.ieag400/tunring.htm GRS EQDQ Monitor (ISGAUDIT) http://pic.dhe.ibm.com/infocenter/zos/v2r1/topic/com.ibm.zos.v2r1.ieag400/emon.htm GRS ISGNQRSP Info http://pic.dhe.ibm.com/infocenter/zos/v2r1/topic/com.ibm.zos.v2r1.ieag400/visype.htm#visype Introduction to GRS SHARE Presentation from 2010 http://www.share.org/p/do/sd/topic=60&sid=591 (need to register at share.org) IBM GRS presentation at NASPAA (which can be found at http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0CDwQFjAC&url=ftp%3A%2F%2Fpublic.dhe.ibm.com%2Fs390%2Fzos%2Fracf%2Fpdf%2Fnynaspa_2005_11_29_grs_101.pdf&ei=bhoGU5DcKKfH0QHYq4GIDA&usg=AFQjCNEBpznPzbj7oHh_sOUyyIFXDhr5dQ&sig2=lU02rfp3PM6Xj5f58V0hMQ&bvm=bv.61725948,d.dmQ&cad=rja ) "z/OS GRS: Performance Considerations" White Paper (which can be found at http://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71006d2e0a/e6be7f9c4c2704578625777000715888/$FILE/grs_perf_v11.pdf ) Thanks, JG Joe Gentile z/OS GRS and Logger Development (845)435-2184 (T/L 295-2184) jwgen...@us.ibm.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
