I have regularly used this with database that's nearing 1000 megabytes. I don't particularly mind slow snapshotting because my workflow is more about restoring database back to baseline than taking copies.
Please don't use this for production. It is not stable enough and you only end up with lost data.
We use our own lvm solution at work, works great, we do something like pgsnap to swap to the snapshot or pgsnap master to work on the master. I'll check this out.
Please don't use this for production. It is not stable enough and you only end up with lost data.