[Beowulf] Defective Mellanox EDR Switches

[Ryan Novosielski]

> On Jun 7, 2018, at 9:43 AM, Peter Kjellström <cap at nsc.liu.se> wrote:
> 
> On Thu, 7 Jun 2018 03:12:43 +0000
> Ryan Novosielski <novosirj at rutgers.edu> wrote:
> 
>> One slight correction: 100% of our switches with FRU PN 00WE097/PN
>> 00WE096Y manufactured on 2016-11-28 (quantity 3) have failed, and one
>> same FRU PN/PN manufactured on 2016-12-15 too. We have another switch
>> with FRU PN 00WE093/PN 00WE092Y that was manufactured on 2016-11-28
>> that has so far been OK, but I’m now suspicious of it.
> 
> Thanks for the heads up.
> 
> To make this data point more valuable, can you add total numbers? That
> is, how many (similar) switches in total, how many bad/good. And for
> how long did they run before exhibiting the problem.

Sure, Peter.

We only have 6 SB7890 switches currently. All were purchased through Lenovo, and all have Lenovo machine types of 0724-HD6. I don’t think this has much to do with Lenovo, though, apart from reselling them. One of the four that failed is actually a replacement for a physically damaged switch (bad port latch), so that means there is even bad replacement inventory out there. All of the 4 aforementioned 00WE096Y switches have failed, 3 manufactured on 2018-11-28 and 1 manufactured on 2016-12-15. I don’t have an exact date for the first failure or the switch installation, but the failure occurred roughly a year after the manufacturing date. My guess is that they were in service for about 9-10 months, but I can probably narrow that down with a little more effort if it matters.

The other two are FRU PN 00WE093/PN 00WE92Y (Lenovo MT 0724-HD5). So far so good on those, though I’m now suspicious of the one manufactured on 2016-11-28.

Additionally, we have two SB7800 switches — FRU PN: 00WE085/PN 00WE084Y. Too new to tell on those — only a few weeks in service. Both were manufactured on 2018-01-08.

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