ANTMINER S2 Discussion and Support Thread

[Marcellow]

Best method is to log in through ssh and issue the "halt" command, wait for a few minutes for things to cool down.
This way you give the psu time to cool down and most important the filesystem on the sd card is unmounted.
If you just flip the power switch under full load chances are that you get a power spike on the 12 volt rail and damage the mounted filesystem.

[1714760477]

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[1714760477]

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[smooth]

Best method is to log in through ssh and issue the "halt" command, wait for a few minutes for things to cool down.
This way you give the psu time to cool down and most important the filesystem on the sd card is unmounted.
If you just flip the power switch under full load chances are that you get a power spike on the 12 volt rail and damage the mounted filesystem.

I looked around their system image pretty carefully and I couldn't find anything that was writing to the SD. Yes, its mounted, but it should still be idle and consistent. It is possible I missed something, but I don't think so.

Reducing the power load to a minimum before physically powering it down might be more important.

[mattie]

Found my culprit with the faulty antminer.
Seems one of my slots doesn't report any temperatures when a module is running in it.
This makes the fans go haywire and probably trip a security thing in the antminer it self or the PSU

so running with 1 blade less works fine?

Yup no problems yet.. though missing out on some gigahashes now :/

On a side note found it not to be the slot it was mining in but one of the cards tripping the PSU protection.
It either looks like one of my miners needs more power then the power supply gives or one of the blades is faulty and tripping the surge protection.
I ordered a 1350W platimax enermax power supply to find out if this resolves it using all 10 blades
I have another antminer S2 which is running fine with the 1000W enermax powersupply but I think these 1000W power supply's are cutting it really close to max usage of the power supply and will probably end up frying it in the end.. not something I am looking forwards to.
On other thoughts I hate to spend another 250 euros to replace the power supply.

[peruana]

Found my culprit with the faulty antminer.
Seems one of my slots doesn't report any temperatures when a module is running in it.
This makes the fans go haywire and probably trip a security thing in the antminer it self or the PSU

so running with 1 blade less works fine?

Yup no problems yet.. though missing out on some gigahashes now :/

On a side note found it not to be the slot it was mining in but one of the cards tripping the PSU protection.
It either looks like one of my miners needs more power then the power supply gives or one of the blades is faulty and tripping the surge protection.
I ordered a 1350W platimax enermax power supply to find out if this resolves it using all 10 blades
I have another antminer S2 which is running fine with the 1000W enermax powersupply but I think these 1000W power supply's are cutting it really close to max usage of the power supply and will probably end up frying it in the end.. not something I am looking forwards to.
On other thoughts I hate to spend another 250 euros to replace the power supply.

You say you have two units, have you tried one at a time by itself?

[Tovadnok]

In my case, the unit worked fine for half a day then shut down.
Once I moved  two S1's to a different outlet and opened the case of the S2 it started working again and has been stable for a while.

[jelin1984]

The basic problem is the small psu

[finlof]

for those having power supply problems - I am interested what your room temp is at.  if i understand correctly higher temps = lower efficiency so you cannot expect the power supply to perform the same at 60 degrees F (15.5 Celsius) vs 80 degrees F (26.5 Celsius).  this also would make a difference as to where it is pulling air from (inside the case B2's vs outside the case B2's).  i for one replaced mine about 2 hrs after receiving it due to the fact that i wanted to overclock it (if possible).  but i did not have any problems with my unit using the stock PS with the room temp at 60 degrees F or below.

[smooth]

Code:

2014-04-18 17:11:07.625820 > Worker [redacted] submitted share more than once!
2014-04-18 17:11:07.635631 > Worker [redacted] submitted share more than once!
2014-04-18 17:11:07.652352 > Worker [redacted] submitted share more than once!
2014-04-18 17:11:07.663747 > Worker [redacted] submitted share more than once!
2014-04-18 17:11:07.678253 > Worker [redacted] submitted share more than once!
2014-04-18 17:11:07.691856 > Worker [redacted] submitted share more than once!
2014-04-18 17:11:07.706369 > Worker [redacted] submitted share more than once!
2014-04-18 17:11:07.720108 > Worker [redacted] submitted share more than once!

etc.

I get many of these on p2pool with the S2. I don't remember getting them with the S1, but I'm not 100% sure. Ghash.io was also reporting a fairly high number of duplicates with the S2 when I tried it.

[philipma1957]

for those having power supply problems - I am interested what your room temp is at.  if i understand correctly higher temps = lower efficiency so you cannot expect the power supply to perform the same at 60 degrees F (15.5 Celsius) vs 80 degrees F (26.5 Celsius).  this also would make a difference as to where it is pulling air from (inside the case B2's vs outside the case B2's).  i for one replaced mine about 2 hrs after receiving it due to the fact that i wanted to overclock it (if possible).  but i did not have any problems with my unit using the stock PS with the room temp at 60 degrees F or below.

short term a cool room the psu will work.  long term it is under sized. 


 be smart pull a blade all worries vanish. this may be the best solution for almost all owners of the gear.

[smooth]

for those having power supply problems - I am interested what your room temp is at.  if i understand correctly higher temps = lower efficiency so you cannot expect the power supply to perform the same at 60 degrees F (15.5 Celsius) vs 80 degrees F (26.5 Celsius).  this also would make a difference as to where it is pulling air from (inside the case B2's vs outside the case B2's).  i for one replaced mine about 2 hrs after receiving it due to the fact that i wanted to overclock it (if possible).  but i did not have any problems with my unit using the stock PS with the room temp at 60 degrees F or below.

short term a cool room the psu will work.  long term it is under sized. 


 be smart pull a blade all worries vanish. this may be the best solution for almost all owners of the gear.

Not even that bad long term. You have a spare blade in case one fails, or you can sell it to someone else with a failed blade, or who wants to build their own homebrew miner around it.

[finlof]

for those having power supply problems - I am interested what your room temp is at.  if i understand correctly higher temps = lower efficiency so you cannot expect the power supply to perform the same at 60 degrees F (15.5 Celsius) vs 80 degrees F (26.5 Celsius).  this also would make a difference as to where it is pulling air from (inside the case B2's vs outside the case B2's).  i for one replaced mine about 2 hrs after receiving it due to the fact that i wanted to overclock it (if possible).  but i did not have any problems with my unit using the stock PS with the room temp at 60 degrees F or below.

short term a cool room the psu will work.  long term it is under sized.  


 be smart pull a blade all worries vanish. this may be the best solution for almost all owners of the gear.

another fairly cheap solution is to replace the power supply with something beefier.  my personal recommendation (and what I did for myself) is to spend around $150 and purchase 2x of these 750w kits - http://www.gekkoscience.com/products/server_supply_breakout_board.html - and run them with power sharing pins and you have more than enough for the S2 (unless we figure how to overclock past 250mhz) and enough for 3 overclocked S1's.  and if you have one of these power supplies go bad you can replace it for a cheap $25 from ebay.  i keep an extra few on hand for myself anyway for rapid deployment for myself and customers.  if you want more info on the maker of these you can read this thread - https://bitcointalk.org/index.php?topic=379677

DISCLAIMER: I am in no way affiliated or compensated by sidehack for this recommendation.  he has a decent product and i feel he should make money for his work and research.

EDIT:  here's pictures of my setup

[seriouscoin]

for those having power supply problems - I am interested what your room temp is at.  if i understand correctly higher temps = lower efficiency so you cannot expect the power supply to perform the same at 60 degrees F (15.5 Celsius) vs 80 degrees F (26.5 Celsius).  this also would make a difference as to where it is pulling air from (inside the case B2's vs outside the case B2's).  i for one replaced mine about 2 hrs after receiving it due to the fact that i wanted to overclock it (if possible).  but i did not have any problems with my unit using the stock PS with the room temp at 60 degrees F or below.

short term a cool room the psu will work.  long term it is under sized.  


 be smart pull a blade all worries vanish. this may be the best solution for almost all owners of the gear.

another fairly cheap solution is to replace the power supply with something beefier.  my personal recommendation (and what I did for myself) is to spend around $150 and purchase 2x of these 750w kits - http://www.gekkoscience.com/products/server_supply_breakout_board.html - and run them with power sharing pins and you have more than enough for the S2 (unless we figure how to overclock past 250mhz) and enough for 3 overclocked S1's.  and if you have one of these power supplies go bad you can replace it for a cheap $25 from ebay.  i keep an extra few on hand for myself anyway for rapid deployment for myself and customers.  if you want more info on the maker of these you can read this thread - https://bitcointalk.org/index.php?topic=379677

DISCLAIMER: I am in no way affiliated or compensated by sidehack for this recommendation.  he has a decent product and i feel he should make money for his work and research.

EDIT:  here's pictures of my setup
[img ]https://dl.dropboxusercontent.com/u/23772269/2x%20power%20supplies%20in%20tandem.jpg[/img]
[img ]https://dl.dropboxusercontent.com/u/23772269/top%20view%20case%20off.jpg[/img]
[img ]https://dl.dropboxusercontent.com/u/23772269/top%20view%20with%20case%20on.jpg[/img]

Thats  to tell you how cheap these products are....

Cheap PSU (yike), cheap board design and cheap casing. Yet not very competitive price.

If you satisfy money for quality, why not get the Coincraft clones?

Seeing your pics, i'm wondering how the heck someone can even call this a 4u rackmountable miner. Btw... ppl should stop putting consumer desktop PSU in a rackmountable server case. The 120mm PSU fan isnt designed to take warm air....

[smooth]

The 120mm PSU fan isnt designed to take warm air....

In fact the air coming out of the case (and therefore inside the case) isn't that warm. It's a lot of air flow given the power usage. Drawing the PSU from outside would probably be better but I doubt it makes that much difference.

[Elyssium]

I have a quick and dirty fix to the PSU problem.

Some of these units draw air from inside the case and there is a blade stacked up right against it.

In these cases unscrew your PSU, flip it, and then make a cutout of the case to accomodate the fan side. Or just leave the lid open a bit.

[seriouscoin]

The 120mm PSU fan isnt designed to take warm air....

In fact the air coming out of the case (and therefore inside the case) isn't that warm. It's a lot of air flow given the power usage. Drawing the PSU from outside would probably be better but I doubt it makes that much difference.

Ofcourse its isnt warm. Thats why i say its poorly designed.

Air will find the least resistant path to go. With such a big gap between the blades, and stupidly bad heatsink, all that noise and air volume are just wasted.

[rigidguy]

Is it more worthwhile to buy this asic or buy BTC straight?

[smooth]

The 120mm PSU fan isnt designed to take warm air....

In fact the air coming out of the case (and therefore inside the case) isn't that warm. It's a lot of air flow given the power usage. Drawing the PSU from outside would probably be better but I doubt it makes that much difference.

Ofcourse its isnt warm. Thats why i say its poorly designed.

Air will find the least resistant path to go. With such a big gap between the blades, and stupidly bad heatsink, all that noise and air volume are just wasted.

My blades are not running hot either. The air flow is effectively cooling the blades. They're all well under 50.

There just isn't that much heat being generated relative to the amount of air flow. I've cautioned people not to switch to "silent" (really just lower cfm) fans on S1s, but on this one I think somewhat lower capacity fans should work fine, as long as ambient is reasonably low.

[seriouscoin]

Is it more worthwhile to buy this asic or buy BTC straight?

BTC  if you're looking into this as invesment.

Mining is a lost right now,

[smooth]

Mining is a lost right now,

Sad to say I agree. Doesn't really matter since S2 is not in stock, and we don't know what the price will be when they offer it again, so no way to know whether it will be a good deal or not.

[seriouscoin]

The 120mm PSU fan isnt designed to take warm air....

In fact the air coming out of the case (and therefore inside the case) isn't that warm. It's a lot of air flow given the power usage. Drawing the PSU from outside would probably be better but I doubt it makes that much difference.

Ofcourse its isnt warm. Thats why i say its poorly designed.

Air will find the least resistant path to go. With such a big gap between the blades, and stupidly bad heatsink, all that noise and air volume are just wasted.

My blades are not running hot either. The air flow is effectively cooling the blades. They're all well under 50.

There just isn't that much heat being generated relative to the amount of air flow. I've cautioned people not to switch to "silent" (really just lower cfm) fans on S1s, but on this one I think somewhat lower capacity fans should work fine, as long as ambient is reasonably low.

You can turn down the fan while adding tunnel..... reducing volume = more air going thro what needed to be cooled.
Infact a proper design should also have a separate chamber for PSU intake.