# Global Devices

> View
> Global Device Status
> Device Group Status and Information
> Device Group Topology
> Disk Path Status
> Actions
> Bringing a Device Group Online and Switching the Primary
> Taking a Device Group Offline
> Modifying Device Group Properties
> Monitoring a Disk Path
> Unmonitoring a Disk Path

## Viewing Global Device Status

To display the status of your global devices and their current primaries, choose Global Devices from the navigation frame in SunPlexTM Manager.

## Viewing Device Group Status and Information

To display a device group's properties, choose the device name from either the Global Devices section in the navigation frame in SunPlex Manager or the Global Device Status table.

The Device Group Properties table appears. This table contains the following information.

Property | Description
--- | ---
Current Status | State of the device group. Device groups can be online or offline.
Device Group Name | Name of the device group.
Device Group Type | Volume manager that creates the disk groups.
Primary | Node that is currently hosting the device group.
Secondaries | Nodes that are currently operating as secondaries for the device group.
Spares | Nodes that are currently operating as spares for the device group.
Nodelist | Nodes that are physically connected to the device group. The order of the list is determined when the device group is created and indicates the failover preference. If a problem occurs, the device group fails over to the next node on the list.
Failback | Returns a device group to its primary node after the primary node has failed and has been restarted as a cluster member. Failback values are enabled and disabled.
Preference Nodelist | Indicates that secondaries are to be chosen according to the order of the node list.
Desired Number of Secondaries | Indicates the desired number of secondaries for the device group. By default, SunPlex Manager uses 1 as the number of secondaries for a device group. If you specify a number that is greater than the actual number of available secondaries, the actual number of available secondaries is used. Check and, if necessary, modify the desired number of secondaries value when you add or remove nodes from a disk device group. Modifying Device Group Properties describes how to change the desired number of secondaries, as well as other device group properties.
Logical Disk | Path to the logical device. This property displays for mounted Solaris Volume Manager, formerly known as Solstice DiskSuite, volumes.
Mounted Filesystem | Mount point for the file system that uses the logical device. This property displays for mounted Solaris Volume Manager, formerly known as Solstice DiskSuite, volumes.

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## Viewing Device Group Topology

To display a graphical representation of the cluster device groups, complete the following steps.

1. From the navigation frame in SunPlex Manager, choose Global Devices.

2. From the View menu, choose Device Group Topology.

This topology displays global device groups (disk device groups) and their primary nodes. From this view, you can click the disk device group and view the group's property information.

Note: If your cluster has more than eight nodes, the device group topology is not displayed as an option from the View menu.

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## Viewing Disk Path Status

To display the status of monitored disk paths, from the navigation frame, choose Global Devices.

The Disk Path table appears. This table contains the following information.

Disk Path | Status
--- | ---
Global Disk Path | State of the disk path. Disk paths can be Ok, Fail, Unmonitored, or Unknown.

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## Bringing a Device Group Online and Switching the Primary

Bring a global device online or switch primaries for the following reasons:

- To activate a disk group

- To complete specific maintenance operations, such as adding or removing disks, with SolarisTM Volume Manager

- To configure load balancing

- To relocate services to another node

  For example, if the current primary needs to be rebooted, switch the device group to a different primary.

To bring a device group online or switch primaries, complete the following steps.

1. From the navigation frame in SunPlex Manager, choose Global Devices>[device group name].

2. From the Action Menu, choose Bring Online/Switch Primary.

   A task window appears. This window prompts you to provide additional information.

3. Choose the device group.

4. Choose a primary node for the disk group.

5. Click Bring Online/Switch Primary.

   SunPlex Manager displays a confirmation message, including the command that is used to complete the task. Write down or copy this command for future use in scripts and other automated tasks.

### Related Topics

Topic | Location
--- | ---
Switching the Primary for a Device Group | Sun Cluster 3.1 System Administration Guide, Administering Global Devices and Cluster File Systems
Creating a New Disk Group When Encapsulating Disk | Sun Cluster 3.1 System Administration Guide, Administering Global Devices and Cluster File Systems

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## Taking a Device Group Offline

You might need to take a device group offline for the following reasons:

- To troubleshoot

- To destroy a device group

- To reduce cluster overhead

- To reduce unnecessary interconnect traffic

To take a device group offline, complete the following steps.

1. From the navigation frame in SunPlex Manager, choose Global Devices>[device group name].

   A task window appears. This window prompts you to provide additional information.

2. From the Action Menu, choose Take Offline.

3. Choose the device group to take offline.

4. Click Take Device Group Offline.

   SunPlex Manager displays a confirmation message, including the command that is used to complete the task. Write down or copy this command for future use in scripts and other automated tasks.

### Related Topics

Topic | Location
--- | ---
Removing and Unregistering a Disk Device Group | Sun Cluster 3.1 System Administration Guide, Administering Global Devices and Cluster File Systems

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## Modifying Device Group Properties

To modify device group properties, complete the following steps.

1. From the navigation frame in SunPlex Manager, choose Global Devices>[device group name].

   The Global Device Properties for the device group that you chose appear.

2. From the Action Menu, choose Modify Properties.

3. Choose the device group that you want to modify.

4. Click Modify Properties.

5. Modify the properties that you want, including the Desired Number of Secondaries, Failback, Preference Nodelist, and Node List.

   Viewing Device Group Status and Information lists and describes device group properties.

6. Click Modify Properties.

   SunPlex Manager displays a confirmation message, including the command that is used to complete the task. Write down or copy this command for future use in scripts and other automated tasks.

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## Monitoring a Disk Path

Complete the following steps to monitor a disk path.

1. From the navigation frame in SunPlex Manager, choose Global Devices.

2. From the Action Menu, choose Enable Disk Path Monitoring.

   A task window appears. This window prompts you to provide additional information.

3. Choose the disk paths to monitor.

4. Click Monitor Disks.

SunPlex Manager displays a confirmation message, including the command that is used to complete the task. Write down or copy this command for future use in scripts and other automated tasks.

### Related Topics

Topic | Location
--- | ---
Disk Path Monitoring | Sun Cluster 3.1 Concepts Guide, Key Concepts - Administration and Application Development
How to Monitor a Disk Path | Sun Cluster 3.1 System Administration Guide, Administering Global Devices, Disk-Path Monitoring, and Cluster File Systems

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## Unmonitoring a Disk Path

You might unmonitor a disk path to complete disk maintenance operations, such as adding or removing disks.

Complete the following steps to unmonitor a disk path.

1. From the navigation frame in SunPlex Manager, choose Global Devices.

2. From the Action Menu, choose Disable Disk Path Monitoring.

   A task window appears. This window prompts you to provide additional information.

3. Choose the disk paths to unmonitor.

4. Click Unmonitor Disks.

SunPlex Manager displays a confirmation message, including the command that is used to complete the task. Write down or copy this command for future use in scripts and other automated tasks.

### Related Topics

Topic | Location
--- | ---
Disk Path Monitoring | Sun Cluster 3.1 Concepts Guide, Key Concepts - Administration and Application Development
How to Unmonitor a Disk Path | Sun Cluster 3.1 System Administration Guide, Administering Global Devices, Disk-Path Monitoring, and Cluster File Systems

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