Over a normal LAN, yes QoS would be recommended; even on a high speed congestion is possible (and likely) over uplinks, and the memory buffers on each port can be filled for very short periods regularly which can cause minor glitches..
However, if this LAN is purely for video devices and there is no other traffic, then there will be little benefit in configuring QoS - if there's no traffic to prioritise video over, then it won't help much.
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Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.