iSCSI-HA is an add-on module for two node pools utilizing Xen Cloud Platform (XCP) or XenServer virtualization environments. It is intended to build highly available two-node clusters with local storage without limiting pool advanced functionality such as live migration.
Generally, this is achieved with separate iSCSI/SAN and Xen clusters which require a minimum of four physical servers and a pair of redundant Ethernet switches to reach an adequate level of fault tolerance. This may not be the most efficient use of hardware for small cluster applications. The goal of iSCSI-HA is to provide a simple framework for building compact, highly available pools utilizing XenServer or Xen Cloud Platform with just two physical hosts.
Full high availability feature set with live migration:
- Local storage backed with replicated block storage (no need for external SAN)
- Two levels of disk redundancy
- Live Migration without external shared storage
A complete step by step How-To and reference design is available for download.