NvME Cache Pool Issue


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I’ve posted on this topic before, but the topic got a bit sidetracked (by me). 

 

Are there any known issues in using NvME’s in a RAID5 Cache Pool?

 

In one of my UnRAID servers, right now, there are 6 2tb NvME’s, RAID5. Writing to Cache Pool, very slow at 350MB/s, read at 750MB/S.

 

As an unassigned Drive, a single NvME r/w at 900 MB/s+.

 

I then tried 6 2.5” 1tb SSD’s in RAID 5, 1.4GB/s read and write.

 

Same server, same settings. There must be some sort of bug or incompatibility, to be getting only 350MB/s on the array, when disk speed test shows each drive capable

of 2000+ MB/s, and an array of the same

number of 2.5” Drives fully

saturates the line. I had a similar issue before, when testing 40GbE, but the r/w speed was capable of 10GbE saturation, just not 40GbE. I rebalanced the array too. No difference 

 

Any ideas here? 

 

 

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