I’ve been awaiting for the Synology NAS firmware upgrade with iSCSI support so I can try out Windows Server 2008 failover clustering on my Hyper-V box. The good news is the DSM 2.2 BETA is out with iSCSI but it is IET based which lacks SCSI-3 persistent reservation support required by Windows Server 2008 cluster. Same problem for some other software iSCSI targets, e.g. OpenFiler
Reference:
http://blog.baeke.info/blog/_archives/2007/10/24/3311645.html