Poor cache drive performance.

[rl2664]

Hello everyone,
I bought a WD green 120 GB SSD to host a VM and for caching a share.
My problem is, the write speed drops after transfering about 5 GB of a 10 GB Transfer from 113 MB/s to around 70 MB/s until the transfer is finished.
Because of a small two disk array writing to it is constantly around 113 MB/s. I'm wondering that writing to the cache disk is poorer than writing directly to the array. Is there any setting that I miss or ist the cheap WD green the problem?
 
Btw. There is no difference if I assign the drive as cache or if I mount it with the UD plugins.

Greetings
Ronny
 
 

 

[JorgeB]

That's probably about right for a small TLC SSD, just make sure it's trimmed, if yes you'll need a better one, a 3D TLC is faster, like the Samsung 850 EVO or Crucial MX500

 

 

[rl2664]

 

 

 

make sure it's trimmed,

 

Using the Dynamix Trim plugin?

I think I order a 850 Evo, i can use the WD in another computer.

 

 

 

 

 

[JorgeB]

17 minutes ago, rl2664 said:

Using the Dynamix Trim plugin?

Yes

[rl2664]

Thank you very much for answering these newbie questions.