I know of RACF/ACF2/TSS databases with over 1 million userids, <1% of these would be used for TSO logon however. I would expect there are systems with over 10 million userids. In the past IBM has released benchmarks of z/OS with over 100,000 concurrently active network connections, and that would be much larger for current hardware. Fun fact is that Google is a distant 2nd to IBM mainframe (far more MF transactions per day than there are Google searches per day, worldwide).
On Wed, Jan 26, 2022 at 9:32 AM Pommier, Rex <rpomm...@sfgmembers.com> wrote: > What's your definition of a largish system? > > -----Original Message----- > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf > Of Phil Smith III > Sent: Tuesday, January 25, 2022 4:24 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: [EXTERNAL] How many userids? > > How many userids does a largish z/OS system have these days? Dozens? > Hundreds? Thousands? > > > > I remember in the early 80s we had 20,000 userids defined on our VM > systems at University of Waterloo, but that was long ago and far away in > many, many ways (and included students, who of course we considered barely > human). > > > > Any rough numbers-even if reported as "A friend's system"-would be > interesting/useful. Thanks. > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send email > to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > The information contained in this message is confidential, protected from > disclosure and may be legally privileged. If the reader of this message is > not the intended recipient or an employee or agent responsible for > delivering this message to the intended recipient, you are hereby notified > that any disclosure, distribution, copying, or any action taken or action > omitted in reliance on it, is strictly prohibited and may be unlawful. If > you have received this communication in error, please notify us immediately > by replying to this message and destroy the material in its entirety, > whether in electronic or hard copy format. Thank you. > > ---------------------------------------------------------------------- > 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
