Swap:Node Details

Partition Directory

A SWAP node may have one or more partitions on it. A partition is just a normal directory. On a unix system, it should not be confused with disk partitions.

In the base of the partition directory are a set of files describing which file groups are on that node, properties for the partition, and the data for the file groups themselves.

Here's what a partition looks like that contains only one file group:

-rw-r--r--  1 toaster nara  286 Jan 15 16:02 7034a42e-02c6-4b04-b8a4-e2e2c1e43bef.txt
-rw-r--r--  1 toaster nara  125 Oct 15 11:53 partition.properties
drwxr-xr-x  3 toaster nara 4096 Oct 15 12:02 web

Partition Metadata

Each partition is assigned a unique UUID. This UIID along with a description of the partition is stored in the base directory of that partition in a file called partition.properties. This file is created when a partition is added and is only read at server startup.

Here's a sample partition.properties file for the partition called vault 1-2

swap.uuid=f42bf2b0-4230-40c8-ba4b-b28efcb73837
swap.description=vault 1-2

File Group Metadata

Information about a file group is stored in a file named after its uuid. (ex: 7034a42e-02c6-4b04-b8a4-e2e2c1e43bef.txt) These files sit in the root partition directory.