16.2. Additional System z Hardware Preparation for Installation Notes
The network configuration must be determined beforehand. Red Hat Enterprise Linux for IBM System z supports QDIO-enabled (Queued Direct I/O) and LCS (LAN channel station) devices. The CTC (channel-to-channel) and IUCV (inter-user communication vehicle) are deprecated and are not supported in Red Hat Enterprise Linux.
For the purposes of this installation, it is recommended that at least 4 GB of disk space (such as two 2 GB DASD, direct access storage device, partitions or equivalent IBM System z SCSI LUNs) be allocated for the installation process. All DASD disk allocations should be completed prior to the installation process. After the installation, more DASD or SCSI (for IBM System z only) disk partitions may be added or deleted as necessary.