I think it was a Microsoft feature but you had to have certified hardware for support. There were 2 windows servers both plugged into the same scsi disk pack,

I think it was a Microsoft feature but you had to have certified hardware for support. There were 2 windows servers both plugged into the same scsi disk pack, and it used a couple of crossover cables I believe for the heartbeat. I remember the unix guys were ribbing the windows guy a bit who confessed he regretted pushing for the cluster as it was so unreliable. It was the typical windows experience of the time with a management console that just hung when doing operations.