On the SU /390, all the devices which are used must be generated in the IORSF. One or more IORSF files are stored in the SVP. One IORSF file is used for the IPL. This is the "current" IORSF file.
KVP devices, LAN devices, and emulated tape devices of the SU /390 are emulated on the MU. In addition, up to two disks of the type EMDISK are emulated for the emergency system of the SU /390 on the MU. ZASLAN devices of the SU /390 are emulated on the HNC. However, the relevant devices must always also be generated in the current IORSF. In the device overviews, the Unit and Unit type columns indicate the unit on which the device is emulated.
Apart from the devices which are emulated on the MU or HNC, further devices, namely disks and real tape devices, exist in BS2000.
For devices which are emulated on the MU, the Host Connector is always 00. For devices which are emulated on the HNC, the Host Connector is 00 or 01.
Channel 00 is a FICON channel. FC-SCSI channels have a Channel Path ID (CHPID) >= 02.
There are no device licenses. LUNs 0000 through FFFF can be used without restriction for configuring devices irrespective of the type.
Information on the generated BS2000 devices of the SU /390 is displayed when the data of the current IORSF file is available.