Why does installation of Red Hat Enterprise Linux 8 on IBM System Z land up into dracut shell?

Issue

• Why does installation of Red Hat Enterprise Linux 8 on IBM System Z land up into dracut shell?
• The contents of generic.prm is as follows.

ro ramdisk_size=40000 cio_ignore=all,!condev
inst.repo=ftp://ftpuser:********@192.168.0.254//ISO/RHEL80/images
rd.znet=qeth,0.0.f000,0.0.f001,0.0.f002,layer2=1,portno=0,portname=foo
ip=192.168.0.140::192.168.0.254:24:testhostname.example.com:encf000:none
nameserver=192.168.0.254
rd.dasd=0.0.4000
inst.vncpassword=test

• The contents or rdsosreport.txt shows this.

[   40.066532] localhost dracut-initqueue[1019]: RTNETLINK answers: Network is unreachable
[   40.784893] localhost iscsid[1016]: can't open InitiatorName configuration file /etc/iscsi/initiatorname.iscsi
[   40.785084] localhost iscsid[1016]: Warning: InitiatorName file /etc/iscsi/initiatorname.iscsi does not exist or does not contain a properly formatted InitiatorName. If using software iscsi (iscsi_tcp or ib_iser) or partial offload (bnx2i or cxgbi iscsi), you may not be able to log into or
[   40.785097] localhost iscsid[1016]: can't open InitiatorAlias configuration file /etc/iscsi/initiatorname.iscsi
[   42.200705] testhostname.example.com dracut-initqueue[1019]: anaconda: stage2 locations are: ftp://ftpuser:*******@192.168.0.254//ISO/RHEL80/images/
[   42.200918] testhostname.example.com dracut-initqueue[1019]: anaconda: fetching stage2 from ftp://ftpuser:*******@192.168.0.254//ISO/RHEL80/images/
[   42.883229] testhostname.example.com dracut-initqueue[1019]: Warning: can't find installer main image path in .treeinfo
[   42.897216] testhostname.example.com dracut-initqueue[1019]:   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
[   42.898384] testhostname.example.com dracut-initqueue[1019]:                                  Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
[   42.902618] testhostname.example.com dracut-initqueue[1019]: curl: (9) Server denied you to change to the given directory
[   42.906507] testhostname.example.com dracut-initqueue[1019]: Warning: Downloading 'ftp://ftpuser:*******@192.168.0.254//ISO/RHEL80/images//images/install.img' failed!
[   42.916829] testhostname.example.com dracut-initqueue[1019]:   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
[   42.917606] testhostname.example.com dracut-initqueue[1019]:                                  Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
[   42.921138] testhostname.example.com dracut-initqueue[1019]: curl: (9) Server denied you to change to the given directory
[   42.925436] testhostname.example.com dracut-initqueue[1019]: Warning: Downloading 'ftp://ftpuser:*******@192.168.0.254//ISO/RHEL80/images//LiveOS/squashfs.img' failed!
[   42.925699] testhostname.example.com dracut-initqueue[1019]: Warning: anaconda: failed to fetch stage2 from ftp://ftpuser:*******@192.168.0.254//ISO/RHEL80/images/
[   48.934266] testhostname.example.com multipathd[1013]: scma: triggering change event to reinitialize
[   48.934514] testhostname.example.com multipathd[1013]: scmb: triggering change event to reinitialize