Huge performance drop during file transfers to cache pool

[krunk]

Hi,

 

I've got a question and I hope that somebody can help me.

 

If I copy a couple of movies over to my UnRaid server, the first few Gb go very fast 100-125mb/s. (I have gb network in place).

Then after about 15 Gb the speeds drops to 25 mb/s and doesn't pick up speed again.

 

Setup

My UnRaid 6.1.3 server has 16Gb of internal memory and a cache pool of 2 SSD drives.

Processor doesn't peak or stress out, but stays at about 10%-20%.

Internal memory is almost 100% used by cache, and about 1Gb is used by system.

 

I'm copying files from a Mac mini with SSD drive and 16Gb of internal memory also.

 

Any ideas how I can solve this?

[trurl]

Are you sure you are writing to cache pool and not to parity array?

[krunk]

I'm very sure that I'm not writing to the array, the files exist on the cache drive.

 

I've included a screenshot from a current copy

[JonathanM]

I remember seeing somewhere that there is a known issue with cache pool speed, and the solution should be in an upcoming release. Hopefully there will be a 6.1.4 out soon with several of the little tweaks and fixes, but I suspect Tom is rather busy with 6.2 at the moment.

[krunk]

Fingers crossed...