This attribute specifies the maximum number of files that should be
kept on the disk in the directory containing the closed files of this
type. The value 0 is defined to mean 'unlimited'.
A different default for each type of Spooler is defined as follows:
- alarm: 30
- accounting: 200
- debug: 2
- log: 10
- scn: 10
- trap: 2 (this value is meaningless and is ignored)
- stats: 200