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I know running a validator currently requires upwards of 20 GB of disk space. How about bandwidth?

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Just checked, NetHogs shows me ~30 KB/sec upload and ~40 KB/sec download for my stellar-core instance (validator without archiver role).

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    Sounds about right. My instance in downloading/uploading around 2.5/3GB per day.
    – Francesco
    Jan 22, 2018 at 20:42
  • Could you do me a favor and also check the current DB size of horizon? If it's not too much trouble I would also love a snapshot of the table index sizes (see stellar.stackexchange.com/questions/1637/…). I am trying to determine required disk space + RAM for our full validator + horizon nodes. I was told Horizon currently needs 300GB disk space already. So I am leaning towards a 12TB drive for the DB to not have to deal with low disk space it for a while. Curious about RAM as well as I'd prefer to load all indexes to memory easily.
    – marcinx
    Sep 16, 2018 at 13:47
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Take a look at the bandwidth usage of my Stellar Core v9.1.0 validating instance (not writing to any history archive) for 6 hours after startup:

Bandwidth

RAM usage increases over time. At least 2GB is a requirement, otherwise you'll have to restart your node continuously.
CPU usage varies. While 1 virtual thread of a VPS is generally sufficient, Stellar Core will take advantage of up to 31 hardware threads2.
For non-archiving validators, disk IO is minimal, while archiving ones usually publish to another host. An SSD drive does the job, anyway.

1 The peer connections and the history system are all in their own thread, and the main logic all takes place in one thread. (source)
2 Many Intel processors have a feature called hyper-threading, which allows for more than 1 software thread to be executed on a given core at the same time. For example, a processor on which each core can execute 2 such threads in parallel is said to have 2 hardware threads per core. On processors without this feature the total number of hardware threads equals the number of cores.

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  • Interesting, your bandwidth is significantly higher than the accepted answer's.
    – Eric
    Jan 30, 2018 at 15:49

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