Hi, The distance is around 30km, do you know any settings on sysplex environment such as GRS and JES2 checkpoint need to aware? Direct DASD via San switch to Dr site , 2GBPS interface , we check with vendor, they didn't find any problem on San switch or DASD, I suspect the system settings
Alan(GMAIL)Watthey <a.watt...@gmail.com> 於 2018年2月15日 星期四寫道： > Tommy, > > This sounds like the PPRC links might be a bit slow or there are not > enough of them. > > What do you have? Direct DASD to DASD or via a single SAN switch or even > cascaded? What settings (Gbps) are all the interfaces running at (you can > ask the switch for the switch and RMF for the DASD)? > > What type of fibre are they? LX or SX? What kind of length are they? > > Any queueing? > > There are so many variables that can affect the latency. Are there any of > the above that you can improve on? > > I can't remember what IBM recommends but 80% sounds a little high to me. > They are only used for writes (not reads). > > Regards, > Alan Watthey > > -----Original Message----- > From: Tommy Tsui [mailto:tommyt...@gmail.com] > Sent: 15 February 2018 12:15 am > Subject: DASD problem > > > > > Hi all, > > > Our shop found the most job elapse time prolong due to pprc synchronization > versus without pprc mode. It's almost 4 times faster if without pprc > synchronization. Is there any parameters we need to tune on z/os or disk > subsystem side? We found the % disk util in RMF report over 80, > Any help will be appreciated. Many thanks > > ---------------------------------------------------------------------- > 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 > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
