SCSI disk driver request queue

The SCSI disk driver maintains a queue of disk requests to be sent to the disk controller. The length of this queue for

each disk is controlled by the SDSKOUT parameter. If a process sends too many requests to the driver, it will put the process to sleep until a free slot in the queue is available. See ``Tuning the number of SCSI disk request blocks'' for details of how to monitor and tune the performance of SCSI disk request queuing.