Oh the memories, i worked like... 20 years ago! on EDS for the Sun Microsystems account as a Solaris System Administrator.

It's hard to explain how advanced was Solaris at the time, specially Solaris 10 which had something named "Zones" which were actually some initial form of containers. With Zones you could run another instance of the OS completely isolated from the main Solaris (the kernel was shared, but for your apps would look like a native OS). You could even run another Solaris version! that was a cool approach to migrate a really old solaris 8 app to solaris 10 without having to change the app code.

Zones, combined with Sun Cluster or Veritas cluster would give you the ability to migrate those zones from one node of the cluster to the other (with it's own lun -external scsi disk/volume attached-) giving you some reaaaaaly interesting and new approaches to system design.

You can think about it as your dad's kubernetes.

Nothing like that could be done in linux at the time, and no one would use linux for any critical task, only for lamp servers.

Time has passed.