Ceph iSCSI Gateway

The iSCSI Gateway presents a Highly Available (HA) iSCSI target that exports RADOS Block Device (RBD) images as SCSI disks. The iSCSI protocol allows clients (initiators) to send SCSI commands to storage devices (targets) over a TCP/IP network, enabling clients without native Ceph client support to access Ceph block storage.

Each iSCSI gateway exploits the Linux IO target kernel subsystem (LIO) to provide iSCSI protocol support. LIO utilizes userspace passthrough (TCMU) to interact with Ceph’s librbd library and expose RBD images to iSCSI clients. With Ceph’s iSCSI gateway you can provision a fully integrated block-storage infrastructure with all the features and benefits of a conventional Storage Area Network (SAN).


The iSCSI gateway is in maintenance as of November 2022. This means that it is no longer in active development and will not be updated to add new features.