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Slow performance and high I/O Wait and disk write cache


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I'm running ESXI, HBA in passthrough mode and Jun's Loader v1.03b DS3617xs without any customization.

I use a INTEL Xeon D-1527, 4 cores and 25 GB with ECC RAM. I also use a Intel X540-T2 network card in passthrough.


My Xpenology server feels a bit sluggish, but I have a hard time to pinpoint the issue. I run quite a few Docker images, but there is hardly any CPU utilization.

Disk and Volume utilization stays around 50% each and I/O wait at ~25%. I'm not sure, but doesn't that sound much? Does anyone have any tips on how to get to the bottom of this?


I've read some people suggesting to enable disk write cache, but that only yields "Operation failed". Not sure if that's possible when using a LSI card in passthrough?


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