1.3.0rc1 and later
The DelayTable directive configures a path to a file that mod_delay uses for storing its timing data. The given path must be an absolute path. It is recommended that this file not be on an NFS mounted partition.
Note that timing data is kept across daemon stop/starts. When new <VirtualHost>s are added to the configuration, though, mod_delay will detect that it does not have a suitable DelayTable for the new configuration, and will clear all stored data.