You can use the DEVSERV QDASD command to display the number of configured cylinders for a device or range of devices, including device model 3390 model A. The first character of the UNIT number represents the subchannel set number.
09.36.34 SYSTEM1 IEE459I 09.36.34 DEVSERV QDASD 625
UNIT VOLSER SCUTYPE DEVTYPE CYL SSID SCU-SERIAL DEV-SERIAL EFC
00F41 IN7996 2107921 2107900 87927 2606 0113-03261 0113-03261 *OK
READ DEVICE CHARACTERISTIC
2107E833900E5E8C FFF72032FFFE000F E000E5A205940222 1309067400000000
0000000000000000 3E3E1F02DFEE0001 0677080F007F4A00 003C000000015777
DCE AT V00E8A578
4878807100000000 0000000002051820 D800FFFEFFFE3E3E 1FF70A00002A0000
00FD7B9C9400F0FE 161F3C1E000A8C00 1500000000015777 0001577600000000
0000000000000000
**** 1 DEVICE(S) MET THE SELECTION CRITERIA
**** 0 DEVICE(S) FAILED EXTENDED FUNCTION CHECKING
When you add the ATTR parameter, DEVSERV QDASD displays device attributes, including if the device is a solid state drive, for example:
UNIT VOLSER SCUTYPE DEVTYPE CYL SSID SCU-SERIAL DEV-SERIAL EFC
ATTRIBUTE/FEATURE YES/NO ATTRIBUTE/FEATURE YES/NO
0D300 TK9085 2107921 2107900 65520 2401 0175-02411 0175-02411 *OK
SOLID STATE DRIVE Y ENCRYPTION N