Topic: New Antminer S9 more discarded shares than accepted (Read 496 times)

Very informative, thank you.

One question:
My utility status is around 0.44 to 0.50, I am using NH and the speed fluctuates a lot. now it is 0 on their website, now 44th, which i find hard to believe for an s9j

The discarded shares are normal. Here is an example of a machine I have pointed to bitcoin.com (BTC side)


https://i.imgur.com/IAddLXo.png

Thanks for the detailed reply. Much appreciated. I should get my first payout in a couple of hours. I have my pool set to PPS. Thanks again.

If you see the correct hashrate on your pool dashboard, e.g. pool.bitcoin.com shows a scoring hash rate near 14 TH/s, then you are fine. The general consensus regarding discarded shares is that it's a useless stat.

As I understand it:

• Elapsed: how much time has passed since you have started hashing to pool. It's slightly shorted than the Uptime shown on the System Overview page, which includes boot time
• Utility is the hashrate of your miner times the luck you have had thus far. Over time, luck stabilizes to near 100%. Your utility is close to your hashrate so your miner has had typical luck.
• Work utility is the typical definition of utility as in cgminer. You should have approximately 1 work utility per 72 megahashes. This means that 209k is a good work utility for a 14 TH/s miner
• Your best share is the share that has met the highest difficulty so far. Shares that meet higher difficulties are better. Bitcoin's current difficulty is around 4 trillion right now. If you found a share that exceeded this difficulty you (or your pool) would submit the proof of work and claim the block reward. Pools generally decrease your difficulty (check #DiffA) so that you will find more shares. If your shares exceed the desired difficulty, then you are rewarded, otherwise not. So although higher shares are better, the difficulty check is on a pass/fail basis.

Also, decreasing difficulty does not give you an advantage. Finding twice as many shares at half the difficulty nets you the same reward. Also, if your first pool is alive, you will not mine to your secondary or tertiary pool choices. They are only backups, they do not relate to your discarded shares. I would recommend leaving them blank if you really only want to mine to one pool.

Your time elapsed was only 36 minutes even though you did mention you mined for some hours, it is very possible that the bitcoin.com pool did not find a block during this time and thus you were not rewarded for your shares thus far. You can always check the bitcoin cash blockchain to see recent blocks and who they were mined by if the proof of work was submitted by known pools.

In the main page (system overview) you can see the file system version, which is the date of your firmware. I assume you probably have the autotune firmware from November 2017. It is not necessary to change your firmware if you are not having problems with your miner.

TL;DR You are paid based on the scoring hash rate, determined by your pool. If you are happy with the hashrate shown in your pool dashboard, you should not be concerned greatly with the miner's stats.

Hi,

I am new to mining and have setup my new S9. I have created an account on pool.bitcoin.com and think that I am currently mining for the past 6 hours. The Antminer web interface says i'm mining at 14TH/s, pool.bitcoin.com says I am hashing at 14TH/s but I do not know what each field means. I am also concerned that I am getting many more discarded shares than accepted.

Elapsed: 36m37s > This is clearly uptime (I powered down and moved the miner so this number is low).
GH/S(RT): 13,917.49 > Current hashrate.
GH/S(avg): 14,068.84 > Average hashrate.
FoundBlocks: 0 > I presume my miner itself has solved 0 blocks (to be expected).
LocalWork: 113,217 > Not sure what this is, number of processed shares maybe?
Utility: 13.87 > No idea what utility is.
WU: 209,404.97 > also no idea.
BestShare: 9511186 > I'm not clear on this either. Are some shares better than others?

In the pool stats I have 1,380 discarded shares? My accepted shares is only 588. This seems very wrong to me?

I am using an EVGA Supernova 1600w T2 PSU. I have not updated the firmware on my S9 as I have no idea of what version is currently on it, which of the several firmware files available on bitmain.com is the correct one for my miner, or whether I need to or not. It is brand new and the latest batch so surely it has the latest firmware on it already? Especially considering it's the latest batch and all the files appear to be dated May 2017 on bitmain.com?

I can ssh into my miner as well using the locally DHCP assigned IP. I logged in to shut it down with the poweroff command. A list of ssh commands for the S9 would be handy but I couldn't find one.

As I said, I've been mining for several hours now but have 0 BCH balance on my pool.bitcin.com account despite my hashrate being indicated as 14TH/s. I did make a few mistakes that I am not sure how to fix. Firstly when signing up, I accidentally put my BCH wallet address in the BTC address field. I was able to subsequently populate my BCH address field with the BCH address but I cannot remove the address from the BTC field as it says I cannot have an empty field for BTC address? I don't have a BTC wallet and I am not mining BTC. I just want to mine BCH and have some confirmation that I am earning BCH and not just wasting electricity.

The second mistake I made is in the antminer pool configuration, I deleted pool 2 and pool 3 and copy and pasted pool 1 info into them. I didn't want them pointing to antpool.com but now instead the backup pools all point to the exact same address and port etc. Not sure if that could be causing my excessive discarded shares issues?

Sorry for so many questions, hopefully someone can help? Thanks.