PostgreSQL clustering with DRBD

I am in the process of setting up a two node cluster.

Can PostgreSQL use DRBD as its storage?

Since the in-memory database would be synchronized with the on-disk database.

If this would be done with every query, this would greatly impact performance.

Since the cluster will be multi-master/dual-primary, do I need to have a separate block device for each PostgreSQL instance or can it use the DRBD device?

I read mostly about MySQL clustering with DRBD and there the query cache should be disabled to make sure data is in-sync.

To me it seems something similar would apply to PostgreSQL.

I believe cybercluster is the most active and complete PostgreSQL clustering solution.

My endgoal is a two node cluster with load sharing and fail over where both nodes can perform reads and writes.

Are there any additional caeats I need to look into?

Any feedback is greatly appreciated