10GB Synology NAS only getting 1GB connection to 10GB Dlink DXS switch

I have recently purchased the following
Synology DS1817 NAS (not the + version, this version has 2 x built in 10GB NIC's & 2 x 1GB NIC's)
2 x Intel X540-T2 NIC's
1 x DLink DXS-1210-10TS 10GB switch

I installed the 2 x  X540-T2 in our Windows 2012r2 Hyper-V host. Each card has two ports. I have configured
all 4 ports as a team and connected each to the DLink DXS switch. All 4 connections are 10GB as expected - perfect!

Connecting the Synology DS1817 NAS I only get a 1GB connection. Local 2m CAT6 cable.

I raised a support case with Synology. Synology support got me to connect the 2 x 10GB NIC's together with a CAT6 patch lead
and connect the NAS to the DLink switch via one of the 1GB ports. Synology confirmed that the were getting 10GB communications
between the 2 x 10GB and concluded that the issue lay "somewhere else" on the network!

I have used tested 2m CAT6 cables from both 10GB NIC's to the Dlink DXS switch - both connect at 1GB
If I set the switch ports to 10GB I loose communication with the NAS.
All ports on the DXS are 10GB.

Anyone have any idea why, if the Synology DS1817 NAS is working correctly, I am not getting a 10GB connection to the DXS10 switch?
Thanks in advance

William SmythAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

David Johnson, CD, MVPOwnerCommented:
There are a lot of knock off cards floating around the marketplace.
It should be passive cooling and have Intel holograms. There is a problem with the cooling of these units, replacing the paste under the heat sinks help.

Using jumbo frames  or setting the MTU to 9000 helps. I've had better success with mellanox nic's
William SmythAuthor Commented:
The Intel x540-t2 cards are from distribution with passove cooling. No issue with the cards as they get 10gb connection to switch.
Issue is only with Synology DS1817 NAS. This device is only getting 1gb connection even thought its 10gb port(s) are connected to 10gb DLink DXS switch.
I will say you have to make sure on the NAS that these network cards are configured properly.

These cards can be use for load balance or line aggregation (trunk).  If these cards are set to operate in either mode you must match those settings in both devices.  Most likely this is your issue since you'll loose communication with the NAS when you force the 10G.

Also, you may try to test another set of cables... either 6 or 6a.  Note: Cat6 can accommodate the 10 GB but 6a is built for it!!
Powerful Yet Easy-to-Use Network Monitoring

Identify excessive bandwidth utilization or unexpected application traffic with SolarWinds Bandwidth Analyzer Pack.

William SmythAuthor Commented:
The DS1817 has 2 x 10GB NICS as standard. According to Synology 10GB should be available "out the box" when connected to 10GB switch with cat 6/cat6a cable. No load balancing or aggregation in place. I just changed the cable(s) to Cat6a but no change. DLink have responded with a request that I update the firmware on the DXS switch - link is to a version that does not appear to be on support website. I will be be updating this evening.
William SmythAuthor Commented:
Thanks for the comments. The firmware supplier by DLink solved the problem. Frustrating as when I got to the correct person they knew about the issue. Shame they cannot publicise and save everyone a lot of time,
William SmythAuthor Commented:
Apply firmware supplied by DLink

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.