As stated in the documentation, in order to use iSCSI it's needed use
CentOS7.5.
Where can I download it?
Thanks
iSCSI Targets
Traditionally, block-level access to a Ceph storage cluster has been
limited to QEMU and |librbd|, which is a key enabler for adoption within
OpenStack environments. Starting with the Ceph Luminous release,
block-level access is expanding to offer standard iSCSI support allowing
wider platform usage, and potentially opening new use cases.
* RHEL/CentOS 7.5; Linux kernel v4.16 or newer; or the Ceph iSCSI
client test kernel
<https://shaman.ceph.com/repos/kernel/ceph-iscsi-test>
* A working Ceph Storage cluster, deployed with |ceph-ansible| or
using the command-line interface
* iSCSI gateways nodes, which can either be colocated with OSD nodes
or on dedicated nodes
* Separate network subnets for iSCSI front-end traffic and Ceph
back-end traffic
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