How does unraid's FUSE filesystem behave when:

 

* share configured as cache+array

* plex uses FUSE mount /mnt/user/movies

* user from plex plays a movie not in cache (/mnt/cache/movies not hit; /mnt/diskX/movies finds the file - spins up hdd)
 

 

1. What would happen if rsync copies the file being played in plex and suddenly /mnt/cache now has the same data logically represented in /mnt/user/movies ?

 

2. Would the FUSE mount transparently refer to /mnt/cache/movies and allow the array disk to sleep?
 

I vaguely remember reading something on reddit indicating this would be the behavior but I can't find that discussion now... asking to validate so a new feature to increase power effiency in unraid could be done in https://github.com/bexem/PlexCache/issues/20

13 hours ago, TheLinuxGuy said:

Would the FUSE mount transparently refer to /mnt/cache/movies and allow the array disk to sleep?

It should but you'd need to re-start playing it.

4 hours ago, JorgeB said:

It should but you'd need to re-start playing it.

 

Could this be confirmed for sure?

I found a past discussion where I read that someone tested and verified with "File Activity Plugin" that actually you don't need to restart replaying anything; the FUSE picks it up without intervention.

Here is the discussions: 

 "Because of shfs mechanism accessing a file from /mnt/user will read/write fro cache if it exists, then from array. Duplicate data are not a problem and globally speed up things."

Also "Edit 13-02-2020: yes, after checking with File Activity plugin, that's the case and its plex/transmission take the file on cache as soon as it is available!"

 

 

 

28 minutes ago, TheLinuxGuy said:

you don't need to restart replaying anything; the FUSE picks it up without intervention.

Not sure, and to be honest I have some doubts, but you can test.