Hi Linda , While searching through the archives , i was able to find this post
https://www.mail-archive.com/ibm-main@bama.ua.edu/msg88192.html This has got a similar discussion .... On Wed, Jun 8, 2016 at 8:27 PM, linda golding <lindagolding...@gmail.com> wrote: > Thanks Curt ... For shared DASD devices , UCW is same in HSA which is used > to serialize when IO requests from multiple LPARS arrives to the same > device . > > I was expecting something similar for console devices . But it appears that > that is not the case for consoles . I hope the hardware gurus in this List > can clarify . > > > Linda > > On Wed, Jun 8, 2016 at 6:42 PM, Pew, Curtis G < > curtis....@austin.utexas.edu> > wrote: > > > On Jun 8, 2016, at 5:22 AM, linda golding <lindagolding...@gmail.com> > > wrote: > > > > > > For every device , there has to be a UCW in HSA . If the ports can be > > > shared between lpars , how are they going to be physically different ? > > > > > > Agree that they are unique logical devices (UCB ) on each LPAR . But > that > > > doesn't mean they have to be physically different . > > > > > > For shared devices , can't they have different UCB's per OS , but map > to > > > the same UCW in HSA ? > > > > I don’t know the details of how things are mapped in HSA. What I know is, > > that in HCD I define 3270-X devices on OSC control units on OSC CHPIDs. > > Then in the HMC I have to define sessions for that OSC CHPID, and each > > session maps a TN3270 LU to a unique device number/LPAR pair. So > physically > > the port is shared by the LPARs, but the logical devices, even when they > > have the same device number, are unique. > > > > -- > > Pew, Curtis G > > curtis....@austin.utexas.edu > > ITS Systems/Core/Administrative Services > > > > > > ---------------------------------------------------------------------- > > 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
