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I recently turned on DAOS (Domino Attachment Object Service) on a Domino server following Paul Mooney's wonderful step-by-step instructions

The server is the cluster mate of a production mail server. It is intended primarily for failover and availability when the main server is down for service so the hardware is minimal. But it did have two physical disks -- one for the operating system (Windows) and one for Domino. So I was able to route the transaction logging files to C: and not have it impact Domino.

The Domino data drive contains primarily mail and CRM databases. The drive was down to 8GB free on a 128GB drive. After turning on DAOS, with the DAOS directory on the same drive as the data directory, and waiting for the files to compact the drive now has 54GB free!

Thank you Lotus.

P.S. The primary production server has plenty of free disk space left. It appears to not be a good candidate for DAOS primarily because of transaction logging. It has a single very large RAID5 array holding both the Windows and Domino partitions. My understanding is that transaction logging would cause a big performance hit in that configuration.