File sharing in Network Attached Storage

This isn't strictly a Mac question, but I always get good advice, so here goes:  We are a design shop using Macs for CAD and similar work.  We want to get a NAS for centralized file sharing.  But how does the NAS handle two people using a file at the same time?  If user A opens and modifies a file, but doesn't save or close it, what does user B see when he opens the same file on the NAS?  Is there a way to restrict access to one user at a time?  This seems a prudent strategy.  Some of the NAS models we're looking at offer an even more confusing Dropbox-like synced folder system that resides on each machine.  Same question:  if I open a file on my machine that is NAS-synced, what does my neighbor see?  Thanks to anyone for your help!

Hi,
You need not to use MSCS cluster solution for TREX distributed installation. You can have all data on central storage that can be NFS mounted or on SAN that can be access by both master and slave servers. Check installation guide. Please find an extract from the guide:
Centralized Data Storage
With centralized data storage, the data is stored so that all TREX hosts can access it.
Centralized data storage can be realized with different hardware solutions: The data can be located on a server that is optimized for file sharing, in a storage area network (SAN), or on a network attached storage server (NAS server). It is important that the connection between the TREX hosts and the data is sufficiently fast. In the following documentation, a central storage location is referred to as a file server regardless of the underlying hardware.
Centralized data storage is necessary if you want indexing to be highly available. You can only move from a master index or queue server to a backup index or queue server if you are using centralized data storage. You can use standard solutions such as the RAID system to make data highly available.
Centralized data storage also has the following advantages if you are only using master and slave hosts:
● Index replication generates less of a network load because the replicated files do not have to be copied onto every slave host.
● Index replication is quicker.
● Less disk space is required for the replicated indexes because all slave hosts share an index copy.
Thanks
Sunny

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    Thanks Bob Timmons.
    In regards to a Plan B, I hear ya brother. I am already on what feels like Plan Z. Getting WiFi to a far off room in an apartment building crowded with WiFi routers is a major pain.
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