そういえば、OpenZFSのrepoってどうなったんだっけと思ったので

# yum install https://zfsonlinux.org/epel/zfs-release.el7_9.noarch.rpm

# cat zfs.repo.rpmnew 
[zfs]
name=OpenZFS for EL7 - dkms
baseurl=http://download.zfsonlinux.org/epel/7.9/$basearch/
enabled=1
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-kmod]
name=OpenZFS for EL7 - kmod
baseurl=http://download.zfsonlinux.org/epel/7.9/kmod/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-source]
name=OpenZFS for EL7 - Source
baseurl=http://download.zfsonlinux.org/epel/7.9/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-next]
name=OpenZFS for EL7 - dkms - Next upcoming version
baseurl=http://download.zfsonlinux.org/epel-next/7.9/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing]
name=OpenZFS for EL7 - dkms - Testing
baseurl=http://download.zfsonlinux.org/epel-testing/7.9/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing-kmod]
name=OpenZFS for EL7 - kmod - Testing
baseurl=http://download.zfsonlinux.org/epel-testing/7.9/kmod/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing-source]
name=OpenZFS for EL7 - Testing Source
baseurl=http://download.zfsonlinux.org/epel-testing/7.9/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

結論：nameが変わっていた。