This feature is available with 3215+ stemcell series.
Certain releases operate more reliably when persistent data is stored using particular filesystem. The Agent currently supports two different persistent disk filesystem types:
ext4 (default) and
Here is an example:
instance_groups: - name: mongo instances: 3 jobs: - name: mongo release: mongo # ... persistent_disk: 10_000 env: persistent_disk_fs: xfs
Currently this configuration lives in the instance group
env configuration. (Eventually we will move this configuration onto the disk type where it belongs.) There are few gotchas:
persistent_disk_fsin any way (even if just explicitly setting the default of
ext4) results in a VM recreation (but reuses same disk)
persistent_disk_fsfor an instance group that previously had a persistent disk will not simply reformat existing disk
To move persistent data to a new persistent disk formatted with a new filesystem you have to set
persistent_disk_fs configuration and change the disk size. If there was no existing persistent disk (for example, for a new deployment), the Agent will format it as requested.