SSD storage

Fusion file system implements a lazy download and upload algorithm that runs in the background to transfer files in parallel to and from the object storage into the container-local temporary directory (/tmp).

To achieve optimal performance it's recommended the use of SSD volume as temporary directory in the cluster computing nodes and launch the Nextflow execution setting scratch directive to false to avoid stage-out transfer time

Add the following snippet in your nextflow.config file to apply those settings:

process.scratch = false
process.containerOptions = '-v /path/to/ssd:/tmp'

In the above snipped replace the path /path/to/ssd with the real path where the SSD volume has been mounted.

Several AWS EC2 instance types include one or more NVMe SSD volumes. Note, however those volumes need to be formatted to be used. See the Amazon documentation for details.