Solaris has (had?) QFS which allows for multi-host access: > Shared QFS adds a multi-writer global filesystem, allowing multiple machines to read from & write

Solaris has (had?) QFS which allows for multi-host access: > Shared QFS adds a multi-writer global filesystem, allowing multiple machines to read from & write to the same disks concurrently through the use of multi-ported disks or a storage area network. (QFS also has a single-writer/multi-reader mode which can be used to share disks between hosts without the need for a network connection.) * https://en.wikipedia.org/wiki/QFS https://en.wikipedia.org/wiki/QFS A few jobs ago I inherited a setup where files/artefacts were uploaded to a file server but had to be shared with clients, but for 'legal' reasons the internal host could not be exposed to the outside world—but (some of?) the data could be. So an external disk pack was purchased and one SAS port went to the internal machine and the other SAS port went to the external machine.