>Please point me in the right direction (manual , website) I need to get >answers for the following > > 1) How many ucbs above the line total without going into multiple >LCS etc can z/OS 1.8 support > > 2) How many ucbs without multiple LCS(?) can a systems support > > I thought it was 32k and something like 64k but don't know if >thats true and need to confirm it in a manual etc. e are looking in this >for our XRC/SDM system which 'sees' all of our DASD.
I think you are confusing concepts for processors with concepts for z/OS. You want to know the limitations for the SDM system so you want the z/OS perspective. z9 introduced Logical Channel Subsystems (LCSS) and support for multiple subchannel sets where set 0 can have base and alias devices while set 1 can only have alias devices. Each subchannel set can have approximately 64K devices and this is supported via "logical" 5-digit devices. Prior to MSS, z/OS supported 63K subchannels (64K - 1K reserved for system use). With MSS, set 0 can have 63.75K subchannels and set 1 can have 64K subchannels. There is a good explanation of this in SG24-7203 IBM System z9 109 Configuration Setup -- Regards, George Kozakos z/OS Level 2 Software Service ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
