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README.md: update troubleshooting and tuning sections according to recent questions from our users

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Aliaksandr Valialkin 2019-09-22 19:06:25 +03:00
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@ -652,6 +652,8 @@ For example, substitute `-graphiteListenAddr=:2003` with `-graphiteListenAddr=<i
* There is no need in Operating System tuning since VictoriaMetrics is optimized for default OS settings.
The only option is increasing the limit on [the number of open files in the OS](https://medium.com/@muhammadtriwibowo/set-permanently-ulimit-n-open-files-in-ubuntu-4d61064429a),
so Prometheus instances could establish more connections to VictoriaMetrics.
* The recommended filesystem is `ext4`, the recommended persistent storage is [persistent HDD-based disk on GCP](https://cloud.google.com/compute/docs/disks/#pdspecs),
since it is protected from hardware failures via internal replication and it can be [resized on the fly](https://cloud.google.com/compute/docs/disks/add-persistent-disk#resize_pd).
### Monitoring
@ -678,6 +680,9 @@ The most interesting metrics are:
### Troubleshooting
* It is recommended to use default command-line flag values (i.e. don't set them explicitly) until the need
in tweaking these flag values arises.
* If VictoriaMetrics works slowly and eats more than a CPU core per 100K ingested data points per second,
then it is likely you have too many active time series for the current amount of RAM.
It is recommended increasing the amount of RAM on the node with VictoriaMetrics in order to improve