The database buffer cleaner processes are responsible for flushing the data residing in the shared memory buffer pools. The optimal number of cleaners depends on your hardware configuration. The maximum value of cleaners is 32, the minimal value is 1. The value can be changed by altering the current ONCONFIG* parameter file located in $INFORMIXDIR/etc.
Informix recommends that you configure a page cleaner for each disk that online uses. However, if more than one disk shares a controler channel, you might find that more than three page cleaners per controller overburdens the controller. In most cases, the additional cleaners do not improve performance unless you seperate successive chunks from a blobspace or dbspace on the disk. Ideally, you should try to assign successive chunks to seperate disk devices.
Hierarchy 
SAP_BASIS (Software Component) SAP Basis Component
BC-DB-INF (Application Component) Informix
STUI (Package) Informix Database Monitor
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