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 <[email protected]> wrote: > On Jun 8, 2016, at 5:22 AM, linda golding <[email protected]> > 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 > [email protected] > ITS Systems/Core/Administrative Services > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
