“System Disk Writes” reports the number of times a task was switched out because it needed to perform a disk write or because it needed to access a page that was being written by another process, such as the housekeeper or the checkpoint process.
Most Adaptive Server writes happen asynchronously, but processes sleep during writes for page splits, recovery, and OAM page writes.
If “System Disk Writes” seems high, check the value for page splits to see if the problem is caused by data page and index page splits.
See “Page splits” for more information.
If the high value for system disk writes is not caused by page splitting, you cannot affect this value by tuning.