directory structures: com, umbrella, $DATA

[guoqing-noaa]

Based on today's discussion, we will have three different types of major directories depending on the lifetime of output files in the production:

1. $DATA: this is the run directory of a task. Files under this directory will be removed upon the completion of a task

2. umbrella: this directory holds output files to be shared inside one cycle and will be purged upon the completion of a cycle

3. com: this directory holds output files to be shared across cycles and will be purged after ~6 days in production.

NOTE: both $DATA and umbrella are under $DATAROOT

In the workflow, we can set the default behavior to use the operational settings while in the develop platforms, users can have the flexibility to set the actual locations of the above three types of directories.

@MatthewPyle-NOAA @BenjaminBlake-NOAA @ShunLiu-NOAA @hu5970 @lgannoaa Let me know if there is anything I missed and feel free to edit/comment. Thanks!

[lgannoaa]

The document for today's demo can be found here.