Adaptec AAR-21610SA Reference Manual page 159

Notes
The controller automatically performs a rescan of the SCSI channel
before the I/O is resumed.
Using this command when there is a pagefile on an array could
cause unexpected behavior.
Use of the controller pause_io command is not permitted
while an array task is running on the controller. (Use the task
list command to display a list of currently running array tasks.)
Syntax
controller pause_io [{integer}]
Parameters
{integer}
Specifies the amount of time, in seconds, to cause the
controller to wait before automatically resuming I/O.
The parameter defaults to the maximum value of 150
seconds. This is necessary because the controller
resume_io command may not be able to access the
controller under some circumstances.
Examples
The following example pauses all I/O activity on the currently
opened controller for 100 seconds:
AAC0> controller pause_io 100
Executing: controller pause_io 100
Related Commands
controller commands:
I
controller resume_io
task commands:
I
task list
(page
8-2)
(page
4-16)
controller Commands
4-13