Xinwei Campus Server Memory Failure Solution

As the school cloud computing market flourishes, applications such as VDI, HPC, and HCI have made servers more and more used in school scenarios. With the increase in the number of uses, many campus cloud solution providers have found that in some provinces and cities, or after the end of the summer vacation, a large proportion of servers cannot be booted properly. To this end, Xinwei has done a lot of research and found that a large number of schools in the second-tier cities, the classroom environment is not good (Figure 1), dust, sand quickly accumulated in the server. (Figure 2 Figure 3)

Figure 1 Figure 2 Figure 3

The failure analysis of these servers in our laboratory found that most of the crux of the failure to boot properly was the server memory/extension card error, which could not be recognized, and the memory of the error reported by different servers was taken out for EDS (Energy Dispersive Spectrometer). Spectral analysis showed that there are C (carbon), O (oxygen), Cl (chlorine), Ni (nickel), Cu (copper), Pd (palladium), Au (gold), Na (sodium), etc. on the gold finger. ingredient. The weight ratio of the elements produced by EDS (positions 1 to 3 are oxidized gold fingers, position 4 is unoxidized gold fingers)

In order to better reproduce these phenomena, Xinwei FAE “Siege Lion” has developed the following environment in the Xinwei professional laboratory to conduct environmental experiments on multiple server brand products on the market. (test steps are as follows)

Test environment: Temperature: 50 ° C Humidity: 95% RH open air environment

Test purpose: To determine whether the server is in a high-temperature, high-humidity, air-free filtering environment, and whether the memory used by each brand server is faulty (oxidized) under the condition of long-term power failure.

Test conditions and steps:

TH: test chamber high temperature set value 50 ° C

D: Test chamber humidity setting value 95%RH

Tr: test chamber recovery time, based on sample recovery status, usually 1 hour

Estimated time-consuming: bare-metal 72 hours without packaging

The feedback on the results of the test is regrettable. No brand server can boot normally in 72 hours of high temperature and high humidity natural air environment.

Xinwei RD/FAE “Siege Lion” will certainly not give up, after several months with dozens of IT100 companies around the world, including memory manufacturers SAMSANG, MICRON; chipset manufacturer INTEL; board manufacturers ASUS, Heshuo; The joint communication and research of technicians such as Foxconn, the following six major issues: 1, high temperature and high humidity environment anti-oxidation requirements; 2, to ensure PCI-E memory signal integrity; 3, MES test problems; Transportation problems; 5, production process problems; 6, the impact of RMA after-sales.

Finally, a flexible antioxidant for high-frequency data transmission was developed jointly with an antioxidant manufacturer in the UK, and an automated coating equipment was developed for the production process.

Xinwei automatic coating equipment

Xinwei’s “Siege Lions” are now experimenting with the latest “weapons” on the delicate server.

Intel Pass Criteria: DDR4 Margining Guideliens-DQ

From the signal analysis data and the standard given by INTEL, we can finally breathe out and conclude that our server is no longer expensive.

Let’s take a look at the experiment that made the “Siege Lion” frustrated (of course, due to the different time, the airborne dust content changed in the air, so we put in a lot of experimental equipment), no anti-oxidant and anti-oxidant coated DIMM. After QTR test high temperature and high humidity for 3 days, the comparison is as follows:

DIMMs without anti-oxidant:

There are anti-oxidant DIMMs (the figure after wiping off the antioxidant):

The above experimental results can be seen: the processing solution of the letter-and-server server anti-oxidation technology comprehensively solves the problem of oxidation in the non-data room environment of the server. And secretly revealing a gossip, our laboratory has verified the 30-day test in the open air environment at 70 ° C high temperature, humidity 100% RH (look at the heartache of the server).

The server anti-oxidation process has become a unique technology process in the Xinwei R&D room. With strong independent research and development capabilities and leading on-demand customization capabilities, we have reason to believe that in the future, Xinwei can develop more innovative technology solutions.

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