Yes. 65,535 is the maximum number of devices that can be represented with four hex digits. If you add one more device, you need an extra hex digit. I understand that channel sets can allow for more than 64K UCBs in an IODF, but I thought that no single LPAR could address all of them at the same time. In order to copy old volumes to new, we have to have all of them online concurrently.
. . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-543-6132 Office ⇐=== NEW [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Nims,Alva John (Al) Sent: Thursday, January 04, 2018 3:33 PM To: [email protected] Subject: (External):Re: Accessing 65536 devices Ah, UCB's are HEX, so x'FFFF' = 65535, correct? Al Nims Systems Admin/Programmer 3 UFIT University of Florida (352) 273-1298 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Jesse 1 Robinson Sent: Thursday, January 04, 2018 6:20 PM To: [email protected] Subject: Re: Accessing 65536 devices So this would involve 5-digit UCBs? We could probably manage that as long as all devices are concurrently accessible. Aren't commands like VARY limited to four digits? . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-543-6132 Office ⇐=== NEW [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Jerry Whitteridge Sent: Thursday, January 04, 2018 3:05 PM To: [email protected] Subject: (External):Fw: Accessing 65536 devices By using the CSSID/SS* in the IODF you can get way more than the basic number Example from a z13 CSS Devices in SS0 Devices in SS1 Devices in SS2 Devices in SS3 / ID Maximum + Actual Maximum + Actual Maximum + Actual Maximum + Actual _ 0 65280 12384 65535 0 65535 0 65535 0 _ 1 65280 0 65535 0 65535 0 65535 0 _ 2 65280 0 65535 0 65535 0 65535 0 _ 3 65280 0 65535 0 65535 0 65535 0 _ 4 65280 0 65535 0 65535 0 65535 0 _ 5 65280 0 65535 0 65535 0 65535 0 -- Jerry Whitteridge IBM Global Services Delivery Manager e-Mail: [email protected] Cell: 602 527 4871 <---- Note New Phone Number ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
