controller failover (
Active-Active
or
All Ports All LUNs
—see
on page 198). If one or more
of these conditions is not met, and on single-controller units, the
Rolling Restart
option is grayed out.
Tip
In order to avoid host connection timeout during a rolling restart, disk timeouts for all hardware and
virtual servers should be set to 150 seconds or more.
System Reboot
(default): This option executes a full restart of the system. While the system is rebooting,
the unit is offline, and arrays and volumes are inaccessible. Therefore, hosts should be safely shut down or
disconnected before performing a
System Reboot
. After the system has finished rebooting, the arrays and
volumes are once again accessible and hosts can be restarted or reconnected.
System Shutdown
: This option flushes the cache data to the disks and shuts down the system.
Therefore, hosts should be safely shut down or disconnected before performing a
System Shutdown
.
System Shutdown
does NOT turn the system completely off; the power supply units (PSUs) are still
active, and fans may still run. To completely power off the system, or to bring the system back on line after
a shutdown, follow the instructions in the system’s
Installation Guide
.
►
To perform a reboot or shutdown:
1. Select the desired option:
Hot Restart
(if available),
Rolling Restart
(if available),
System Reboot
, or
System Shutdown
.
2. Check the confirmation check box.
3. Click
Execute NOW
to reboot the system.
A message is displayed, informing you that the reboot or shutdown sequence is in progress. Once the unit is
back online, click the
Back
button to return to the
Reboot System
page.
Note
While a rolling restart or reboot operation is in progress, the system status icon may indicate a
FAILURE. The FAILURE message will clear once the system is fully restarted.
Power Restoration Policy
The
Power Restoration Policy
section controls how the unit behaves after A/C power has been restored after
an interruption (due to power failure or the removal of the power cords).
Note
This setting is not used by E-Series P models, which automatically boot when power is restored.
Boot immediately after power is restored
: After power is restored, the unit automatically starts up. This
is the default setting.
Remain unpowered until the controller push-switch (SW0) is pressed
: After power is restored, the
unit will not start up until the
SW0
switch on either RAID Controller is pressed. This switch must be
pressed for approximately 4 seconds to start the unit, then released as soon as the unit begins to power up.
►
To set the power restoration policy:
1. Select the desired power restoration policy by clicking its selection button.
2. Click
Save Configuration
.
A message is displayed, informing you that the settings has been saved. Click the
Back
button to return to the
Reboot System
page.
Controller Maintenance
The
Controller Maintenance
section allows you to take a RAID Controller offline for maintenance or diagnostic
purposes. It also allows you to test failover settings (see
on page 198) before deploying the
system into your production environment. The RAID Controller that is currently being used to access the
Nexsan High-Density Storage system’s graphical user interface (GUI) is noted by the text
(current)
after it.
Chapter 3: The Graphical User Interface — System Administration
Nexsan High-Density Storage
User Guide
195