Reddit mentions of 10GBase-SR SFP+ Transceiver, 10G 850nm MMF, up to 300 Meters, Compatible with Cisco SFP-10G-SR, Meraki MA-SFP-10GB-SR, Ubiquiti UF-MM-10G, Mikrotik, Netgear, D-Link, Supermicro, TP-Link and More.

It is a 10 Gigabit Fiber switch. I assume that's what's throwing you off. In each port, instead of a standard copper Ethernet cable, you install Fiber SFP Transceiver modules and connect to other devices using fiber patch cables.

Thanks. I may grab some SFP+ stuff off of Amazon to try it out with your info on crush resistance.

Lot Of 2 Mellanox Connectx-2 PCI-Epress x 8 10GBe Ethernet Network Server Adapter Interface Card MNPA19-XTR In Bulk Package https://www.amazon.com/dp/B016OYD0D4/ref=cm_sw_r_cp_apa_i_BS4FDb316SB36

Total Cable Solutions OM3 10Gb 50/125 Multimode Duplex Fiber Optic Patch Cable, LC to LC (25 Meters) https://www.amazon.com/dp/B07DP8D7JW/ref=cm_sw_r_cp_apa_i_8S4FDbJABVY4G

10 Gigabit SFP+ LC Multi-mode Transceiver, 10GBASE-SR Module for Cisco SFP-10G-SR, Ubiquiti UF-MM-10G, Mikrotik S+85DLC03D, D-Link, Supermicro, Netgear, TP-Link, Broadcom, Linksys (850nm, DDM, 300m) https://www.amazon.com/dp/B00U8Q7946/ref=cm_sw_r_cp_apa_i_qT4FDbCXDTHTM

What is even better is buying brand new Mikrotik/LB4M/LB6M compatible optics with next day shipping from amazon for less than $20 each. Used these in my LB4m and moved them right over to my crs226-24g-2s+rm.

https://www.amazon.com/gp/product/B00U8Q7946/

10 Gigabit SFP+ LC Multi-Mode Transceiver, 10GBASE-SR Module for Cisco SFP-10G-SR, Meraki MA-SFP-10GB-SR, Ubiquiti UF-MM-10G, Mikrotik, D-Link, Supermicro, (850nm, DDM, 300m) https://www.amazon.com/dp/B00U8Q7946/ref=cm_sw_r_sms_apa_i_fDi3Db0N3SF3M

Something like this: https://www.amazon.de/Cisco-kompatibel-SFP-10G-SR-SFP-10G-SR-SR-S-Multimode-Transceiver/dp/B00U8Q7946/

I have a mix of transceivers, but here is one of the brands: https://www.amazon.com/10Gtek-SFP-10G-SR-Transceiver-10GBASE-SR-300-meter/dp/B00U8Q7946/ref=sr_1_3?crid=Y3NWC9IXKQ26&keywords=sfp%2B+transceiver&qid=1555660991&s=gateway&sprefix=sfp%2B+tr%2Caps%2C221&sr=8-3

Here is the NIC (this listing is for a lot of 2): https://www.amazon.com/10Gtek-SFP-10G-SR-Transceiver-10GBASE-SR-300-meter/dp/B00U8Q7946/ref=sr_1_3?crid=Y3NWC9IXKQ26&keywords=sfp%2B+transceiver&qid=1555660991&s=gateway&sprefix=sfp%2B+tr%2Caps%2C221&sr=8-3

These are not the same listings I bought from (bought my stuff 2 years ago), but they should be the same hardware. As for the X520, it's common for OEMs to take hardware like NICs and put their stamp on it.

> Edit: Looks like LAN1 is doing all the lifting and LAN2 is pretty much idling even though they're both connected.

This is normal. To saturate both lan adapters at the same time you would either need an MPIO iSCSI setup or have multiple clients transferring data concurrently (which will likely be bottlenecked by the disk performance on this unit, so MPIO or MCS iSCSI with dual LAN on client side is the only viable usecase and will only help sequential io).

That said if you do want faster than gigabit speed - don’t mess with iSCSI and multipass — instead upgrade to 10G networking when you are ready. It’s got pretty cheap these days — you can get connectivity between nas and pc for under $250 - including lan adapters, SFP+ switch (mikrotik has 5-port one for $150), multimode fiber cable and SFP+ to optics transiecers. Or just go with Direct-attached like this and save even more.

But that’s a big detour into offtopic..

I've had really good luck with these for my Cisco Catalyst and Brocade gear, but never tried one in a Meraki Switch: https://www.amazon.com/10Gtek-SFP-10G-SR-Transceiver-10GBASE-SR-300-meter/dp/B00U8Q7946/ref=sr_1_3?s=electronics&ie=UTF8&qid=1542040616&sr=1-3&keywords=10G+SFP%2B

https://www.amazon.co.uk/dp/B00U8Q7946/ref=cm_sw_r_other_apa_i_RG1GDbNGE3Q9A

Or fibre transceivers