Informix chunk files can be cooked files or raw partitions. For better performance and reliability on production databases, use raw disk partitions.
Only an experienced system administrator creates chunk files.
The default space required for the root, temp, and log dbspaces is about 1 MB per user. For the root dbspace it is at least 60 MB, for the ccm dbspace it is about 2 MB per user. For the default 40 users, the total is about 220 MB. This estimate is only a rough estimate for the initial database chunk. Allocate dbspace generously to allow for future growth.