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I have recently moved my Plex to a Synology DS918+ and have installed a 128GB SSD in drive bay 4 which is setup as a read only cache… (later when funds allow i will be utilising thje M.2 slots to create a read/write cache.
I have noticed when scrolling through a long list of movies i can hear LOTS of activity on the NAS hard disks as it loads thumbnails for each movie. Does PLEX not have access to the cache… is the cache exclusively used for file shares and not internally for apps accessing the same disks ?
It would seem that after having the NAS for a few days if it had access to the cache the thumbnails should all load up from the SSD cache and i shouldnt be hearing the hard drive at all until say i played some media etc.
But the thumbnails are all stored in thousands of small files - they are not as far as i know read from a single file database or anything. so i find it strange that there is clearly a massive hard drive hit every day when i load up my movie list as the thumbnails are coming from small files that should have been cached ???
DSM is in control of the cache. If DSM decides to copy your file(s) to cache based on frequency of use then it will do so and you will see the performance gain. In all cases, the files will need be read at least once.
Yes i understand that it is DSM that has control - I was simply asking if the cache was exclusively for file sharing etc or if Apps (in this case) Plex also have the ability to cache none shared files such as the thumbnail directories etc. i havnt used my nas for anything else really so would have thought after several days of opening the movie list i would have started to see the movie list opening up without excessive disk activity now that it had had plenty of time to cache all the thumbnails.
