The way to run these is having a well pump water into a drum and have closed loop water supplies running to each miner (and don't use the radiator).  Using the radiator would be senseless for venting the air out of the mining space. You would just need some circulating pumps (get a three speed and set for 40 psi) and a bladder to distribute each water lead. If the hashrate was a bit higher, I would order some.

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I give you an amen on that.

Not only that - at THOSE prices, what if something happens during shipment? What if you never get the shipment at all?  Mistakes become major mistakes at $12K each.

You posted this - my sentiments exactly.  Thanks.

Exhaust fans won't do that much good.  I run 40 miners and have them outside of a 4'X8' plywood box.  I have them exhausting directly into the box which pressurizes it.  I have 4, 12" exhaust hoses running (static) to the exterior.  The pressurization of the box pushes the air out the open exhaust vents just as fast as an inline fan could do it.  I used to have 6, 1000 cfm inline fans pulling on the exhaust until I discovered that the fans were actually restricting the air flow, not helping.  You need lots of fresh air on the intake side of the miners and you must control the hot air exiting very well, not allowing any major leaks in the box, etc.  Message me and I'll send you some pictures.  Just my 2 cents.

Varies - right now I'm getting paid in LTC and BCH, but there are dozens of approved coins to be paid from.

Would like to note here that over the last week our L21s have been hashing well at prohashing.  The accepted rate is almost at dashboard level for about 1/3 of them and is in the mid-500 MHs for most.

Exactly.  So, the "all new" Bitmain description is not accurate. In other words, people will "talk S*$#" about a company as long as they don't tell the truth about their product.

They have a right to their opinion - as do you.  Bitmain selling this as being "pleased to announce the all-new #Antminer V9 #BitcoinCash #Bitcoin miner, especially designed for long-term use in fast-growing mining operations"is being slightly misleading.  But, the specs are there for all to decide.  My question would be why bother releasing this inefficient miner now unless they are selling "old" not "new" board stock?  All looks a little suspect to me... and that's just a IMHO comment.

Maybe but I don't see much of any improvement until a firmware update that has been promised soon.  A couple of things I DO like about the L21:  They are very cool.  It's almost impossible to overheat them if they get fresh air.  The other thing I like about them is that they provide us with a lot of flexibility in our power circuit planning.  We can get three L21s and 2 L3+ miners on a 20 amp, 220V circuit with a full 80% utilization.  Makes planning flexible.  Hopefully, the firmware update will smooth out any performance issues.

Easy now! He just reviewed the miner.  We operate the L21s as well.  Although we mostly run Bitmain products, we do have 12 of the L21s.  I can tell you that it's not a latency issue.  It doesn't matter which pool you point to, it's still a problem.  There is a high number of rejected shares on all of our L21s (10-40%) and the reported hashrate (as a result) mainly fall mid to upper 400 MHs. 

This is a real issue.  I am not sure if BW will fix it or not.  I know that Hyperbitshop's CEO just told a friend of mine that he would get to a firmware update in a few weeks.  But, seems as if Hyperbitshop isn't selling the miners any longer since they are listed on the BW.com site.

Unfortunately, we all seem to be in the same situation.  I'm having lots of problems with my miners.  The L3+ is MUCH more stable and productive IMHO.  I might add that the BW.com website has now listed the L21s for sale.  I am not sure what the status is of the former distributor, but they are not answering our messages any longer.

When I unpacked my miners, I could see that they had been running for 187 days previous to arrival at my house.  See picture.
https://imgur.com/a/vre7B

It seems strange unless they are interested in some sort of collaboration or development that would compliment a decentralized cloud storage goal. From SOPHON:

"Deep learning sets off the explosive development of AI applications, leading humans to enter the intelligent era from the information age. It takes both the 'engine', massive computing power, and the 'fuel', a huge amount of data, to successfully launch the deep learning rocket into the AI sky. Based on its extensive experiences in the development and production of chip and system, Bitmain is dedicated to developing the tensor computing processor and related products focusing on accelerating deep learning and serving the better cost effective and the lower power consuming solutions for AI."

This new Antminer A3 miner appears to be a basis for Bitmain's entrance into a cryptocurrency which will support the massive off-site data storage requirements inherent in its AI operations.

From Blake2.net - This algo utilizes parallelism and other tools to increase speed.  Q: Why is BLAKE2 so fast?
A: BLAKE2 is fast in software because it exploits features of modern CPUs, namely instruction-level parallelism, SIMD instruction set extensions, and multiple cores. BLAKE2 also benefits from the optimization work performed during the SHA-3 competition (see for example this paper by two of the designers of BLAKE2).

Q: Why do you want BLAKE2 to be fast? Aren't fast hashes bad?
A: You want your hash function to be fast if you are using it to compute the secure hash of a large amount of data, such as in distributed filesystems (e.g. Tahoe-LAFS), cloud storage systems (e.g. OpenStack Swift), intrusion detection systems (e.g. Samhain), integrity-checking local filesystems (e.g. ZFS), peer-to-peer file-sharing tools (e.g. BitTorrent), or version control systems (e.g. git). You only want your hash function to be slow if you're using it to "stretch" user-supplied passwords, in which case see the next question.

It is is good question.  WHY would they make a miner for blake2b?

That was my impression. The new mining will increase difficulty which generally increases prices.  If miners are paid in Siacoin, then that should drive the price up, not down, right? This would increase demand.  I am buying SC on Bittrex now.

You will need to look at the shipping/packing manifest that was provided to Customs.  If you purchased them through Hyperbit, there's no telling what they listed the product as on the forms.  One person I know saw that Hyperbit had listed the miners as "baby napkins."  So, they are asking you for conformity papers - but conformity papers for what?  What product code?  Then, you can go to step 2, which would depend on product code, etc.

I have seen several listed at gilliamtechnicalservices.com ready to ship.

We ordered almost $40K in miners from Hyperbit.  They were a month late, promised free shipping (which they never did) and promised to compensate us for the lost time (they never did).  As a result, we ordered 20 L3+ units, paid with BCH, confirmed in a few minutes and shipped early.  Over the last few months, Bitmain has significantly improved their customer service.  I usually get responses to technical questions within 48 hours.  Not so w/Hyperbit (at least for us in general). We show 585 MHs on miner interfaces, but pool data shows low to mid 500s.  VERY loud.  If you have them at home, go with the L3+

Figured out the problem.  Our back up pools were with antpool under a different stratum.  As soon as we changed to a totally different pool, it cleared up the issue.  Apparently, our miners even had trouble with antpool's back up servers.

Now this problem has spread to 5 other S9s.  None of our D3s or L3s are impacted?  Any ideas?  S9s were working fine and then they simultaneously have the same issue. We have tried all of the above, miner reset button, too.

Also reset the miner with the reset button on the miner.  No luck.