For the most part, z/OS versions from the last couple of decades, perform
SenseID, RDC and RCD CCWs to determine the device type and characteristics of
the device, that is the number of cylinders and if EAV is supported. That being
said, you should not have to do anything but either VARY ON/OFF or IPL.
The DS8K will report the correct number of CYLs to the OS.
Use DS QD,xxxx,RDC,RCD where xxxx is an address and the response will look like:
IEE459I 09.28.56 DEVSERV QDASD 771
UNIT VOLSER SCUTYPE DEVTYPE CYL SSID SCU-SERIAL DEV-SERIAL EFC
03040 RES250 2107961 2107900 10017 3000 0175-ZB771 0175-ZB771 *OK
<<<<<<<<<<<<<<<< 10017 CYL count
READ DEVICE CHARACTERISTIC
2107E833900C5E84 1FF720322721000F E000E5A205940222 1309067400000000
<<<<<<<<<<<<<<< 2107E8 3390-0C
0000000000000000 32321F02DFEE0001 0677080F007F4800 003C000000002721
READ CONFIGURATION DATA
DC010100F0F0F2F1 F0F7F9F0F0C9C2D4 F7F5F0F0F0F0F0F0 F0E9C2F7F7F11040
D4020000F0F0F2F1 F0F7F9F6F1C9C2D4 F7F5F0F0F0F0F0F0 F0E9C2F7F7F11000
D0000000F0F0F2F1 F0F7F9F6F1C9C2D4 F7F5F0F0F0F0F0F0 F0E9C2F7F7F01000
F0000001F0F0F2F1 F0F7F9F0F0C9C2D4 F7F5F0F0F0F0F0F0 F0E9C2F7F7F11000
0000000000000000 0000000000000000 0000000000000000 0000000000000000
0000000000000000 0000000000000000 0000000000000000 0000000000000000
0000000000000000 0000000000000000 0000000000000000 0000000000000000
800003012D001E00 3000004300000201 0008C04004FEF44C 0301000000002800
**** 1 DEVICE(S) MET THE SELECTION CRITERIA
**** 0 DEVICE(S) FAILED EXTENDED FUNCTION CHECKING
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