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182 QXS G2 Hardware Installation and Maintenance Guide

3 To determine if any reads or writes occur during interval, subtract the set of numbers you recorded

in step 1 from the numbers you recorded in step 2.

• If the resulting difference is zero, then I/O has stopped.

• If the resulting difference is not zero, a host is still reading from or writing to this disk group.

• Continue to stop I/O from hosts, and repeat step 1 and step 2 until the difference in step 3 is

zero.

NOTE: See the QXS G2 CLI Reference Guide for additional information. Optionally, you can use the

disk management utility (GUI) to monitor IOPs and MB/s.

Shutting Down a Controller Module

Shutting down the controller in a RAID chassis ensures that a proper failover sequence is used, which

includes stopping all I/O operations and writing any data in write cache to disk.

• If both controller modules are shut down, hosts cannot access the system’s data.

• Perform a shut down before you remove a controller module from a chassis, or before you power

off its chassis for maintenance, repair, or a move.

• Use the disk management utility (GUI) or the CLI to perform a shutdown.

Using the Disk Management Utility (GUI)

1 Sign-in to the disk management utility (GUI).

2 In the System panel in the banner, select Restart System.

The Controller Restart and Shut Down panel opens.

3 Select the Shut Down operation, which automatically selects the controller type Storage.

4 Select the controller module to shut down: A, B, or both.

5 Select OK. A confirmation panel appears.

6 Select Yes to continue; otherwise, select No. If you selected Yes, a message describes shutdown

activity.

NOTE: If an iSCSI port is connected to a Microsoft Windows host, the following event is

recorded in the Windows event log:

Initiator failed to connect to the target

NOTE: See the

QXS G2 Disk Management Utility User Guide

for additional information.

Using the CLI

1 Log-in to the CLI.

2 In your dual-controller system, verify that the partner controller is online by running the

command;

show controllers

3 Shut down the failed controller—A or B—by running the command:

shutdown a

shutdown b

Quantum QXS G2 Series User Manual

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