slowfs_temp_path
The `slowfs_temp_path` directive sets the temporary storage directory for files before they are moved to a caching area in NGINX's SlowFS Cache Module.
Description
The slowfs_temp_path directive specifies a temporary filesystem path where files will be stored prior to their transfer to the cache area. This is particularly useful when dealing with slow filesystem environments, as it allows NGINX to efficiently manage file transfers without impacting the performance of the web server. The directive allows for up to four arguments, where the first argument is mandatory. This first argument is the path for the temporary storage, and the optional arguments specify the directory structure within that path. By default, the temporary path is set to /tmp with a directory structure that has one level for the first stage and two for the second stage, benefiting the file organization and preventing excessive flat directory structures.
When using slowfs_temp_path, it is essential to ensure that the specified temporary storage is on the same filesystem as the defined cache area using slowfs_cache_path. This avoids unnecessary file copying, which can negate the benefits of the caching mechanism. Additionally, since this module only works optimally on slower filesystems when the cache is placed on faster disks, appropriate planning of the directory structure and storage locations is vital for maximizing caching performance.
Config Example
http {
slowfs_temp_path /data/slowfs/temp 1 2;
slowfs_cache_path /data/slowfs/cache levels=1:2 keys_zone=my_cache:10m;
}Ensure the slowfs_temp_path and slowfs_cache_path are on the same filesystem to avoid duplicate file copying.
If the temporary path has inadequate permissions, NGINX will fail to write to it, causing caching issues.
Be cautious with directory levels, as having too many levels might complicate the structure without giving performance benefits.