Which site has the fastest DASD? If not the DR site, then that could be an issue. At least it used to be a decade ago when I had XRC running to slower DASD and it began pacing I/O to the point that it affected Production I/O response times very significantly. Solved problem by making DR DASD as fast or faster than production DASD. YMMV
-----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Mike Schwab Sent: Tuesday, February 1, 2022 1:21 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: IBM disk replication issue It will delay synchronous writes, because the write is not returned until the mirrored disk is updated. Asynchronous writes do not delay the return since it occurs when the primary disc is updated. On Tue, Feb 1, 2022 at 5:50 PM Peter <dbajava...@gmail.com> wrote: > > Hello > > Recently we were a victim of storage replication link between > production and DR site(metro mirroring). Due to this many of our batch > jobs took more time than expected. So here I would like to understand > how the dasd update happens ? For example when a batch allocates some > dataset on DASD in production site so does it returns back or finishes > off the I/O operation is finished from both production and DR ? > > If there is latency in dark fibre connectivity between production and > DR , Will it impact the batch job elapsed time ? > > Could someone please shed some light on this? > > Peter > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- 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
