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This bug was initially created as a copy of Bug #1844423

I am copying this bug because: 
This bug should also be fixed in RHEL-9.
The new recommended minimum should be 512 MiB, see the upstream PR:
https://github.com/rhinstaller/anaconda/pull/3302


Since RHEL 8.2, I always get an installation error of:

DNF error: Error in POSTTRANS scriptlet in rpm package kmod-kvdo

Finally I found anaconda recommends the size of /boot partition is 200 Mib or higher but 200 MB is not enough for the partition and the partition usage is 100% and causes above error.

Probably I think the minimum /boot size would be 300MB and the recommendation is 400MB in RHEL 8.y if I think the kernel update later.

Fixed in a pull request: https://github.com/rhinstaller/anaconda/pull/4096

Checked that anaconda-34.25.1.10-1.el9 is in nightly compose RHEL-9.1.0-20220809.0

Moving to VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (anaconda bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7977