HP NetRAID-4M Controller - Manual (Page 39)

3-15
Working with Controllers
Rescanning a Controller
The controller rescan operation scans the controller’s channels and
verifies the presence of currently connected devices and newly
connected devices. If any disk partition structures have changed,
rescanning updates those changes in the controller memory’s
container and partition lists. If you add devices to the controller, the
rescan enables the controller to use those devices.
The CLI allows you to do the following:
■ Display a list of channels on a controller
■ Rescan the channels connecting the controller and disks
To display a list of channels on a controller, use the controller
show channels command, as in the following example. In the
example, the Ch# column indicates channels 0 and 1 are present on
the controller.
HPN0> controller show channels
Executing: controller show channels
Ch# Host ID Targets Type Max Usage
--- ------- ------- --------- ---------
0 7 15 NoInfo NoInfo
1 7 15 NoInfo NoInfo
To rescan the controller, use the controller rescan command,
as in the following example:
HPN0> controller rescan
Executing: controller rescan
If you add a device to the controller, the controller rescan
command verifies that the new device has been added. Use the
disk list command to make sure the new device was recognized.
See Displaying the SCSI Device ID on page 4-2 for more information
on using the
disk list command to display the SCSI device IDs.
Pausing and Resuming Controller I/O
I/O on a controller may need to be paused so that you can make
changes to attached devices without rebooting. For example you
may need to change SCSI channel assignments or swap disk drives.