maybe we have the same errors.
We first tested a 10Gbit setup with a CRS305 - the 4 Port SFP+ Mikrotik Switch.
We use this SFP+ DAC Cables: https://www.fs.com/de/products/74621.html
This worked fantastic.
We then bought 4x CRS326-24S+2Q+RM.
We wanted to upgrade our Hyper-V Cluster and Storage to 10Gbit.
We had a lot of problems - server freezes (until network connection was terminated) , ping timeouts, error connections iscsi volumes etc.
Then we stopped the upgrade and kept at 1Gbit Speed.
We noticed through the statistics tab of our Emulex network cards, that we have from 300 to 6000 CRS Errors within 10 Seconds
of iperf3 tests - depending on the port and the cable we used.
We have these errors with Emulex 10Gbit OCE11102 network cards also with HP NC523SFP network cards.
If we connect two servers directly with the same DAC cable we have no errors.
If we use 2m cisco compatible cables we also have no errors.
If we use 5m Fujitsu compatible cables we also have no errors.
If we use FS-10Gbit GBics , Dell 10Gbit Gbics, Intel 10Gbit GBics we have no errors.
So there is a incompatibility between the mikrotik switch and these cables.
As the cables make no problems when directly connection servers with them here seems to be a problem with the mikrotik
- CRS305 -FS.com Generic DAC cable - no errors
- CRS326 -FS.com Generic DAC cable - CRC errors (errors occur with all 4 Mikrotik Switches we have)