Minimum Disk Read speeds for HD

I configured my Plex video storage to use Storage Spaces with Parity disks... these have some notoriously slow speeds ( i get between 40 - 140 MB/s reads)

 

With 480p quality video, i never get any stuttering ... but when 1080p is being streamed it stutters a few times a minute.

 

I am running Plex in a Hyper-V VM with 4 core and dynamic memory, when i stream i see the following... very similar SD/HD:

 

70-80 % CPU

3 GB ram

40 MB/s disk

 

Have i reached the threshold for HD video?  Is there any diagnostics that Plex can run to validate my environment?  Are there any settings that can be tweaked? 

 

 

I configured my Plex video storage to use Storage Spaces with Parity disks... these have some notoriously slow speeds ( i get between 40 - 140 MB/s reads)

With 480p quality video, i never get any stuttering ... but when 1080p is being streamed it stutters a few times a minute.

I am running Plex in a Hyper-V VM with 4 core and dynamic memory, when i stream i see the following... very similar SD/HD:

70-80 % CPU

3 GB ram

40 MB/s disk

Have i reached the threshold for HD video?  Is there any diagnostics that Plex can run to validate my environment?  Are there any settings that can be tweaked? 

I FEEL YOUR PAIN.....on the whole storage space thing. I mean, WTF Microsoft...

I don't know exact minimal, but is there a way for you to put a file on a drive by itself and test it out? Should tell you if SS is your bottleneck...

I FEEL YOUR PAIN.....on the whole storage space thing. I mean, WTF Microsoft...

I don't know exact minimal, but is there a way for you to put a file on a drive by itself and test it out? Should tell you if SS is your bottleneck...

I moved my media to SSD, still get stutter.  I moved my PLEX VM to SSD for improved transcode writes, still get stutter.  This stutter is consistent across all clients ... Win 8+10 apps / Chrome HTML5 / XBOXONE

After more forum searching, everyone brings up a VC1 bug that has been fixed for years in XBMC / FFMPEG ... turns out the videos i am attempting to view are VC1 codec :\   Frustrated.

Disk read speeds are quite unimportant to video operations. Video will stream well even from old slow floppy disks.

The things that matter are CPU (when transcoding) and stability of connection. There are other things but those are good places to look.

The bug you mention is a possibility.

BTW: Plex is not disk intensive at all. Except for operating system overhead an SSD is totally unneeded for Plex. The Plex database needs to be local but can reside on a quite slow drive without any deterioration in performance. The video files can reside on quite slow drives without any impact on performance.

NOTE: With a large number of streams being served at the same time disk access speed could become important but even then most of the time CPU speed would be the limiting factor.

I have the NightHawk router with Plex built in and this is their tip

Tip!: For performance reasons, if you opt for using a thumb drive as the main USB device for Plex Media Server data, ensure you use a USB3 device capable of writing at least 45mb/s or you may encounter performance issues when streaming media.

Link: https://support.plex.tv/articles/230934267-netgear-nighthawk-x10-router/

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