I know running a validator currently requires upwards of 20 GB of disk space. How about bandwidth?
Just checked, NetHogs shows me ~30 KB/sec upload and ~40 KB/sec download for my
stellar-core instance (validator without archiver role).
1Sounds about right. My instance in downloading/uploading around 2.5/3GB per day. 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.– marcinxSep 16, 2018 at 13:47
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:
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.
Interesting, your bandwidth is significantly higher than the accepted answer's.– EricJan 30, 2018 at 15:49