“Disk I/O Structures” reports the number of I/Os delayed by reaching the limit on disk I/O structures. When Adaptive Server exceeds the number of available disk I/O control blocks, I/O is delayed because Adaptive Server requires that tasks get a disk I/O control block before initiating an I/O request.
If the result is a nonzero value, try increasing the number of available disk I/O control blocks by increasing the configuration parameter disk i/o structures. See the System Administration Guide.
