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Docs: added more notes on node requirements

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troymc 2016-06-20 10:35:19 +02:00
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docs/source/nodes/node-requirements.md
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@ -24,9 +24,13 @@ Every OS has memory requirements; check the memory requirements of your OS.
There is [documentation about RethinkDB's memory requirements](https://rethinkdb.com/docs/memory-usage/). In particular: "RethinkDB requires data structures in RAM on each server proportional to the size of the data on that server’s disk, usually around 1% of the size of the total data set." ([source](https://rethinkdb.com/limitations/))
Also, "The storage engine is used in conjunction with a custom, B-Tree-aware caching engine which allows file sizes many orders of magnitude greater than the amount of available memory. RethinkDB can operate on a terabyte of data with about ten gigabytes of free RAM." ([source](https://www.rethinkdb.com/docs/architecture/))
## Storage Requirements
The RethinkDB storage engine has a number of SSD optimizations, so you can benefit from using SSDs. ([source](https://www.rethinkdb.com/docs/architecture/))
If you want a RethinkDB cluster to store an amount of data D, with a replication factor of R (on every table), and the cluster has N nodes, then each node will need to be able to store R×D/N data plus the storage required for the OS and various other software (RethinkDB, Python, etc.). The secondary indexes also require some storage.
For failover to work, [every RethinkDB table must have at least three replicas](https://rethinkdb.com/docs/failover/), i.e. R ≥ 3.
@ -36,9 +40,11 @@ Also, RethinkDB tables can have [at most 64 shards](https://rethinkdb.com/limita
## Compatible File Systems
RethinkDB has [issues with `btrfs`](https://github.com/rethinkdb/rethinkdb/issues/2781) (B-tree file system).
RethinkDB "supports most commonly used file systems." ([source](https://www.rethinkdb.com/docs/architecture/))
It's best to have a file system that supports direct I/O, because that will improve RethinkDB performance. Many compressed or encrypted file systems don't support direct I/O.
It has [issues with BTRFS](https://github.com/rethinkdb/rethinkdb/issues/2781) (B-tree file system).
It's best to have a file system that supports direct I/O, because that will improve RethinkDB performance (if you tell RethinkDB to use direct I/O). Many compressed or encrypted file systems don't support direct I/O.
## CPU Requirements