DBSpace and Chunk Sizing Question

All, Any thoughts on the below dbspace and chunk configuration? I very much appreciate this group and its collective knowledge - thanks in advance! We are building a medium size server with database storage on a SAN device. I have been given 3 x 140 GB "raw" devices to use for data - the root, logging, etc. spaces are on separate devices. We will probably use about 20 GB on each of the 140 GB devices. My first thought is to create a 20 GB dbspace (one chunk each) on each of these devices for a total of 60 GB: dbs_1 = 20 GB dbs_2 = 20 GB dbs_3 = 20 GB Backup strategy is ER + Nightly Level 0 dumps to the filesystem. We may include ontape in the near-term. Environment = Solaris 10 | IDS 10.0 FC3 | OLTP System Thank you!! Ben sending to informix-list