Thanks I solved the problem. Some parameters were wrong, and I had to changes some things around. Gadi
-----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Ravi Gaur Sent: Wednesday, March 27, 2019 8:08 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: CTC question Gadi, This is how IOCP look like at our end for CHPID 25 which pair with CHPID 24 (not listed) : CNTLUNIT CUNUMBR=1A18,PATH=((CSS(0),25)),UNITADD=((00,008)), * LINK=((CSS(0),18)),CUADD=1,UNIT=FCTC IODEVICE ADDRESS=(1A18,008),UNITADD=00,CUNUMBR=(1A18), * STADET=Y, * NOTPART=((CSS(0),PART1,PART2,PART3,PART4)), * UNIT=FCTC Now there's few things i noticed at your end the CU/control unit is 1501 however device links are 200 also to make a pair both partitions which are in the access list for the devices/ctc should be UP . ---------------------------------------------------------------------- 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