NVME cache write low speed issue only from unassigned disk


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HI ,

 

I'm a new user of UNRAID, I'm migrating my existing disk to my new custom NAS and I have an issue with the cache drive.

My actual situation is:

 

2 hdd in a new array without parity

1 cache nvme device

1 unassigned disk (will be my parity disk after the migration of the files)

 

When I rsync my big files from the unassigned disk to my array, the read/write speed is about 130-160MB/s.

When I move my files (with mover) from the cache to the array the read/write speed is about 130-160MB/s.

When I copy a big file from network to my cache the write speed of my cache is about 130-160MB/s

 

BUT when I rsync my file from my unassigned disk to the cache, after 20-30 secs at 130-160MB/s, my read/write speed decrease at about 30-40MB/s (????????) WHY???

 

What could be the problem? (I disabled already folder caching plugin)

 

Thanks

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