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Oracle Solaris Cluster System Administration Guide Oracle Solaris Cluster 4.1 |
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Oracle Solaris Cluster System Administration Guide Oracle Solaris Cluster 4.1 |
1. Introduction to Administering Oracle Solaris Cluster
2. Oracle Solaris Cluster and RBAC
3. Shutting Down and Booting a Cluster
4. Data Replication Approaches
5. Administering Global Devices, Disk-Path Monitoring, and Cluster File Systems
Dynamic Reconfiguration With Quorum Devices
How to Add a Shared Disk Quorum Device
How to Add a Sun ZFS Storage Appliance NAS Quorum Device
How to Add a Quorum Server Quorum Device
Removing or Replacing a Quorum Device
How to Remove the Last Quorum Device From a Cluster
How to Replace a Quorum Device
How to Modify a Quorum Device Node List
How to Put a Quorum Device Into Maintenance State
How to Bring a Quorum Device Out of Maintenance State
Administering Oracle Solaris Cluster Quorum Servers
Starting and Stopping the Quorum Server Software
Displaying Information About the Quorum Server
How to Display Information About the Quorum Server
Cleaning Up Stale Quorum Server Cluster Information
How to Clean Up the Quorum Server Configuration Information
7. Administering Cluster Interconnects and Public Networks
10. Configuring Control of CPU Usage
A quorum device is a shared storage device or quorum server that is shared by two or more nodes and that contributes votes that are used to establish a quorum. This section provides the procedures for administering quorum devices.
You can use the clquorum command to perform all quorum device administrative procedures. In addition, you can accomplish some procedures by using the clsetup interactive utility. Whenever possible, quorum procedures are described in this section by using the clsetup utility. For more information, see the clquorum(1CL) and clsetup(1CL) man pages.
When you work with quorum devices, keep in mind the following guidelines:
All quorum commands must be run from a global-cluster node.
If the clquorum command is interrupted or fails, the quorum configuration information can become inconsistent in the cluster configuration database. If this inconsistency occurs, either rerun the command or run the clquorum reset command to reset the quorum configuration.
For highest availability of the cluster, ensure that the total number of votes that are contributed by quorum devices is less than the total number of votes that are contributed by nodes. Otherwise, the nodes cannot form a cluster if all quorum devices are unavailable, even if all nodes are functioning.
Do not add a disk that is currently configured as a quorum device to an Oracle Solaris ZFS storage pool. If a configured quorum device is added to a ZFS storage pool, the disk is relabeled as an EFI disk and quorum configuration information is lost and the disk no longer provides a quorum vote to the cluster. Once a disk is in a storage pool, that disk can then be configured as a quorum device. Or, you can unconfigure the disk, add it to the storage pool, then reconfigure the disk as a quorum device.
Note - The clsetup command is an interactive interface to the other Oracle Solaris Cluster commands. When clsetup runs, the command generates the appropriate specific commands, in this case clquorum commands. These generated commands are shown in the examples at the end of the procedures.
To view the quorum configuration, use clquorum show. The clquorum list command displays the names of quorum devices in the cluster. The clquorum status command provides status and vote count information.
Most examples shown in this section are from a three-node cluster.
Table 6-1 Task List: Administering Quorum
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You must consider a few issues when completing dynamic reconfiguration (DR) operations on quorum devices in a cluster.
All of the requirements, procedures, and restrictions that are documented for the Oracle Solaris DR feature also apply to Oracle Solaris Cluster DR support, except for the operating system quiescence operation. Therefore, review the documentation for the Oracle Solaris DR feature before using the DR feature with Oracle Solaris Cluster software. You should review in particular the issues that affect non-network IO devices during a DR detach operation.
Oracle Solaris Cluster rejects DR remove-board operations that are performed when an interface is present that is configured for a quorum device.
If the DR operation would pertain to an active device, Oracle Solaris Cluster rejects the operation and identifies the devices that would be affected by the operation.
To remove a quorum device, you must complete the following steps, in the order indicated.
Table 6-2 Task Map: Dynamic Reconfiguration With Quorum Devices
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This section provides procedures to add a quorum device. Ensure that all nodes in the cluster are online before adding a new quorum device. For information about determining the number of quorum vote counts necessary for your cluster, recommended quorum configurations, and failure fencing, see Quorum and Quorum Devices in Oracle Solaris Cluster Concepts Guide.
 | Caution - Do not add a disk that is currently configured as a quorum device to a Solaris ZFS storage pool. When a configured quorum device is added to a Solaris ZFS storage pool, the disk is relabeled as an EFI disk and quorum configuration information is lost and the disk no longer provides a quorum vote to the cluster. Once a disk is in a storage pool, that disk can then be configured as a quorum device. You can also unconfigure the disk, add it to the storage pool, and then reconfigure the disk as a quorum device. |
The Oracle Solaris Cluster software supports the following types of quorum devices:
Shared LUNs from the following:
Shared SCSI disk
Serial Attached Technology Attachment (SATA) storage
Sun ZFS Storage Appliance from Oracle
Oracle Solaris Cluster Quorum Server
Procedures for adding these devices are provided in the following sections:
Note - You cannot configure replicated disks as quorum devices. If you try to add a replicated disk as a quorum device, you receive the following error message and the command exits with an error code.
Disk-name is a replicated device. Replicated devices cannot be configured as quorum devices.
A shared-disk quorum device is any attached storage device that is supported by Oracle Solaris Cluster software. The shared disk is connected to two or more nodes of your cluster. If you turn fencing on, a dual-ported disk can be configured as a quorum device that uses SCSI-2 or SCSI-3 (the default is SCSI-2). If fencing is turned on and your shared device is connected to more than two nodes, you can configure your shared disk as a quorum device that uses the SCSI-3 protocol (the default protocol for more than two nodes). You can use the SCSI override flag to make the Oracle Solaris Clustersoftware use the SCSI-3 protocol for dual-ported shared disks.
If you turn fencing off for a shared disk, you can then configure the disk as a quorum device that uses the software quorum protocol. This would be true regardless of whether the disk supports SCSI-2 or SCSI-3 protocols. Software quorum is a protocol from Oracle that emulates a form of SCSI Persistent Group Reservations (PGR).
| Caution - If you are using disks that do not support SCSI (such as SATA), you should turn SCSI fencing off. |
For quorum devices, you can use a disk that contains user data or is a member of a device group. View the protocol that is used by the quorum subsystem with a shared disk by looking at the access-mode value for the shared disk in the output from the cluster show command.
See the clsetup(1CL) and clquorum(1CL) man pages for information about the commands that are used in the following procedures.
Oracle Solaris Cluster software supports shared-disk (both SCSI and SATA) devices as quorum devices. A SATA device does not support a SCSI reservation, and you must disable the SCSI reservation fencing flag and use the software quorum protocol to configure these disks as quorum devices.
To complete this procedure, identify a disk drive by its device ID (DID), which is shared by the nodes. Use the cldevice show command to see the list of DID names. Refer to the cldevice(1CL) man page for additional information. Ensure that all nodes in the cluster are online before adding a new quorum device.
Use this procedure to configure SCSI or SATA devices.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
# clsetup
The clsetup Main Menu is displayed.
The Quorum Menu is displayed.
The clsetup utility asks what type of quorum device you want to add.
The clsetup utility asks which global device you want to use.
The clsetup utility asks you to confirm that the new quorum device should be added to the global device you specified.
If the new quorum device is added successfully, the clsetup utility displays a message to that effect.
# clquorum list -v
Example 6-1 Adding a Shared Disk Quorum Device
The following example shows the clquorum command generated by clsetup when it adds a shared-disk quorum device and a verification step.
Assume the root role that provides solaris.cluster.modify RBAC authorization on any
cluster node.
[Start the clsetup utility:]
# clsetup
[Select Quorum>Add a quorum device]
[Answer the questions when prompted.]
[You will need the following information.]
[Information: Example:]
[Directly attached shared disk shared_disk]
[Global device d20]
[Verify that the clquorum command was completed successfully:]
clquorum add d20
Command completed successfully.
[Quit the clsetup Quorum Menu and Main Menu.]
[Verify that the quorum device is added:]
# clquorum list -v
Quorum Type
------- ----
d20 shared_disk
scphyshost-1 node
scphyshost-2 node
Ensure that all nodes in the cluster are online before adding a new quorum device.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
# iscsiadm modify discovery -s enable
# iscsiadm list discovery
Discovery:
Static: enabled
Send Targets: disabled
iSNS: disabled
# iscsiadm add static-config iqn.LUNName,IPAddress_of_NASDevice
# devfsadm -i iscsi
# cldevice refresh# /usr/cluster/bin/cldevice populate
Use the cldevice show command to see the list of DID names. Refer to the cldevice(1CL) man page for additional information.
# clquorum add d20
The cluster has default rules for deciding whether to use scsi-2, scsi-3, or software quorum protocols. See the clquorum(1CL) man page for more information.
Before You Begin
Before you can add an Oracle Solaris Cluster Quorum Server as a quorum device, the Oracle Solaris Cluster Quorum Server software must be installed on the host machine and the quorum server must be started and running. For information about installing the quorum server, see the How to Install and Configure Oracle Solaris Cluster Quorum Server Software in Oracle Solaris Cluster Software Installation Guide.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
The switch supports Rapid Spanning Tree Protocol (RSTP).
Fast port mode is enabled on the switch.
One of these features is required to ensure immediate communication between cluster nodes and the quorum server. If this communication is significantly delayed by the switch, the cluster interprets this prevention of communication as loss of the quorum device.
If you use classful subnets, as defined in RFC 791, you do not need to perform these steps.
The following is an example entry which contains a public-network IP address and netmask:
10.11.30.0 255.255.255.0
nodename netmask + broadcast +
Add a hostname-to-address mapping to the file, such as the following.
ipaddress qshost1
The hostname of the computer where the quorum server is running.
# clsetup
The clsetup Main Menu is displayed.
The Quorum Menu is displayed.
Then type yes to confirm that you are adding a quorum device.
The clsetup utility asks what type of quorum device you want to add.
The clsetup utility asks you to provide the name of the new quorum device.
The quorum device name can be any name you choose. The name is only used to process future administrative commands.
The clsetup utility asks you to provide the name of the host of the quorum server.
This name specifies the IP address of the machine where the quorum server runs or the hostname of the machine on the network.
Depending on the IPv4 or IPv6 configuration of the host, the IP address of the machine must be specified in the /etc/hosts file, the /etc/inet/ipnodes file, or both.
Note - The machine you specify must be reachable by all cluster nodes and must run the quorum server.
The clsetup utility asks you to provide the port number of the quorum server.
The clsetup utility asks you to confirm that the new quorum device should be added.
If the new quorum device is added successfully, the clsetup utility displays a message to that effect.
# clquorum list -v
Example 6-2 Adding a Quorum Server Quorum Device
The following example shows the clquorum command that is generated by clsetup when it adds a quorum server quorum device. The example also shows a verification step.
Assume the root role that provides solaris.cluster.modify RBAC authorization on any
cluster node.
[Start the clsetup utility:]
# clsetup
[Select Quorum > Add a quorum device]
[Answer the questions when prompted.]
[You will need the following information.]
[Information: Example:]
[Quorum Device quorum_server quorum device]
[Name: qd1]
[Host Machine Name: 10.11.124.84]
[Port Number: 9001]
[Verify that the clquorum command was completed successfully:]
clquorum add -t quorum_server -p qshost=10.11.124.84 -p port=9001 qd1
Command completed successfully.
[Quit the clsetup Quorum Menu and Main Menu.]
[Verify that the quorum device is added:]
# clquorum list -v
Quorum Type
------- ----
qd1 quorum_server
scphyshost-1 node
scphyshost-2 node
# clquorum status
=== Cluster Quorum ===
-- Quorum Votes Summary --
Needed Present Possible
------ ------- --------
3 5 5
-- Quorum Votes by Node --
Node Name Present Possible Status
--------- ------- -------- ------
phys-schost-1 1 1 Online
phys-schost-2 1 1 Online
-- Quorum Votes by Device --
Device Name Present Possible Status
----------- ------- -------- ------
qd1 1 1 Online
d3s2 1 1 Online
d4s2 1 1 Online
This section provides the following procedures for removing or replacing a quorum device:
When a quorum device is removed, it no longer participates in the voting to establish quorum. Note that all two-node clusters require that at least one quorum device be configured. If this is the last quorum device on a cluster, clquorum(1CL) will fail to remove the device from the configuration. If you are removing a node, remove all quorum devices connected to the node.
Note - If the device you intend to remove is the last quorum device in the cluster, see the procedure How to Remove the Last Quorum Device From a Cluster.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
# clquorum list -v
# clsetup
The Main Menu is displayed.
Answer the questions displayed during the removal process.
# clquorum list -v
Example 6-3 Removing a Quorum Device
This example shows how to remove a quorum device from a cluster with two or more quorum devices configured.
Assume the root role that provides solaris.cluster.modify RBAC authorization on any cluster node. [Determine the quorum device to be removed:] # clquorum list -v [Start the clsetup utility:] # clsetup [Select Quorum>Remove a quorum device] [Answer the questions when prompted.] Quit the clsetup Quorum Menu and Main Menu.] [Verify that the quorum device is removed:] # clquorum list -v Quorum Type ------- ---- scphyshost-1 node scphyshost-2 node scphyshost-3 node
Troubleshooting
If you lose communications between the cluster and the quorum server host while removing a quorum server quorum device, you must clean up stale configuration information about the quorum server host. For instructions on performing this cleanup, see Cleaning Up Stale Quorum Server Cluster Information.
This procedure removes the last quorum device from a two-node cluster by using the clquorum force option, -F. Generally, you should first remove the failed device and then add the replacement quorum device. If this is not the last quorum device in a two-node cluster, follow the steps in How to Remove a Quorum Device.
Adding a quorum device involves a node reconfiguration, which touches the failed quorum device and panics the machine. The Force option lets you remove the failed quorum device without panicking the machine. The clquorum command enables you to remove the device from the configuration. For more information, see the clquorum(1CL) man page. After you remove the failed quorum device, you can add a new device with the clquorum add command. See Adding a Quorum Device.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
If the quorum device failed, use the -F Force option to remove the failed device.
# clquorum remove -F qd1
Note - You can also place the node to be removed in maintenance state and then remove the quorum device with the clquorum remove quorum command. The clsetup cluster administration menu options are not available while the cluster is in install mode. See How to Put a Node Into Maintenance State and the clsetup(1CL) man page for more information.
# clquorum list -v
Example 6-4 Removing the Last Quorum Device
This example shows how to put the cluster in maintenance mode and remove the last remaining quorum device in a cluster configuration.
[Assume the root role that provides solaris.cluster.modify RBAC authorization on any
cluster node.]
[Place the cluster in install mode:]
# cluster set -p installmode=enabled
[Remove the quorum device:]
# clquorum remove d3
[Verify that the quorum device has been removed:]
# clquorum list -v
Quorum Type
------- ----
scphyshost-1 node
scphyshost-2 node
scphyshost-3 node
Use this procedure to replace an existing quorum device with another quorum device. You can replace a quorum device with a similar device type, such as replacing a NAS device with another NAS device, or you can replace the device with a dissimilar device, such as replacing a NAS device with a shared disk.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
You need to first add a new quorum device to the configuration to take the place of the old device. See Adding a Quorum Device to add a new quorum device to the cluster.
See How to Remove a Quorum Device to remove the old quorum device from the configuration.
Refer to the hardware procedures in your hardware manual for your disk enclosure. See also the Oracle Solaris Cluster 4.1 Hardware Administration Manual.
This section provides the following procedures for maintaining quorum devices:
You can use the clsetup utility to add a node to or remove a node from the node list of an existing quorum device. To modify a quorum device's node list, you must remove the quorum device, modify the physical connections of nodes to the quorum device you removed, then add the quorum device to the cluster configuration again. When a quorum device is added, the clquorum command automatically configures the node-to-disk paths for all nodes attached to the disk. For more information, see the clquorum(1CL) man page
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
# clquorum list -v
# clsetup
The Main Menu is displayed.
The Quorum Menu is displayed.
Follow the instructions. You will be asked the name of the disk to be removed.
Follow the instructions. You will be asked the name of the disk to be used as the quorum device.
# clquorum list -v
Example 6-5 Modifying a Quorum Device Node List
The following example shows how to use the clsetup utility to add nodes to or delete nodes from a quorum device node list. In this example, the quorum device name is d2, and the final result of the procedures adds another node to the quorum device node list.
[Assume the root role that provides solaris.cluster.modify RBAC
authorization on any node in the cluster.]
[Determine the quorum device name:]
# clquorum list -v
Quorum Type
------- -----
d2 shared_disk
sc-phys-schost-1 node
sc-phys-schost-2 node
sc-phys-schost-3 node
[Start the clsetup utility:]
# clsetup
[Type the number that corresponds with the quorum option.]
.
[Type the number that corresponds with the option to remove a quorum device.]
.
[Answer the questions when prompted.]
[You will need the following information:]
Information: Example:
Quorum Device Name: d2
[Verify that the clquorum command completed successfully:]
clquorum remove d2
Command completed successfully.
[Verify that the quorum device was removed.]
# clquorum list -v
Quorum Type
------- -----
sc-phys-schost-1 node
sc-phys-schost-2 node
sc-phys-schost-3 node
[Type the number that corresponds with the Quorum option.]
.
[Type the number that corresponds with the option to add a quorum device.]
.
[Answer the questions when prompted.]
[You will need the following information:]
Information Example:
quorum device name d2
[Verify that the clquorum command was completed successfully:]
clquorum add d2
Command completed successfully.
Quit the clsetup utility.
[Verify that the correct nodes have paths to the quorum device.
In this example, note that phys-schost-3 has been added to the
enabled hosts list.]
# clquorum show d2 | grep Hosts
=== Quorum Devices ===
Quorum Device Name: d2
Hosts (enabled): phys-schost-1, phys-schost-2, phys-schost-3
[Verify that the modified quorum device is online.]
# clquorum status d2
=== Cluster Quorum ===
--- Quorum Votes by Device ---
Device Name Present Possible Status
----------- ------- -------- ------
d2 1 1 Online
Use theclquorum command to put a quorum device into maintenance state. For more information, see the clquorum(1CL) man page. The clsetup utility does not currently have this capability.
Put a quorum device into maintenance state when taking the quorum device out of service for an extended period of time. This way, the quorum device's quorum vote count is set to zero and does not contribute to the quorum count while the device is being serviced. While in maintenance state, the quorum device's configuration information is preserved.
Note - All two-node clusters require at least one configured quorum device. If this is the last quorum device on a two-node cluster, clquorum will fail to put the device into maintenance state.
To put a cluster node into maintenance state, see How to Put a Node Into Maintenance State.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
# clquorum disable device
Specifies the DID name of the disk device to change, for example, d4.
The output for the device you placed in maintenance state should read zero for the Quorum Device Votes.
# clquorum status device
Example 6-6 Putting a Quorum Device Into Maintenance State
The following example shows how to put a quorum device into maintenance state and how to verify the results.
# clquorum disable d20 # clquorum status d20 === Cluster Quorum === --- Quorum Votes by Device --- Device Name Present Possible Status ----------- ------- -------- ------ d20 1 1 Offline
See Also
To re-enable the quorum device, see How to Bring a Quorum Device Out of Maintenance State.
To put a node into maintenance state, see How to Put a Node Into Maintenance State.
Run this procedure each time a quorum device is in maintenance state and you want to bring the quorum device out of maintenance state and reset the quorum vote count to the default.
| Caution - If you do not specify either the globaldev or node options, the quorum count is reset for the entire cluster. |
When you configure a quorum device, Oracle Solaris Cluster software assigns the quorum device a vote count of N-1 where N is the number of connected votes to the quorum device. For example, a quorum device that is connected to two nodes with nonzero vote counts has a quorum count of one (two minus one).
To bring a cluster node as well as its associated quorum devices out of maintenance state, see How to Bring a Node Out of Maintenance State.
To learn more about quorum vote counts, see About Quorum Vote Counts in Oracle Solaris Cluster Concepts Guide.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
# clquorum enable device
Specifies the DID name of the quorum device to reset, for example, d4.
# clquorum show +
Example 6-7 Resetting the Quorum Vote Count (Quorum Device)
The following example resets the quorum count for a quorum device back to the default and verifies the result.
# clquorum enable d20 # clquorum show + === Cluster Nodes === Node Name: phys-schost-2 Node ID: 1 Quorum Vote Count: 1 Reservation Key: 0x43BAC41300000001 Node Name: phys-schost-3 Node ID: 2 Quorum Vote Count: 1 Reservation Key: 0x43BAC41300000002 === Quorum Devices === Quorum Device Name: d3 Enabled: yes Votes: 1 Global Name: /dev/did/rdsk/d20s2 Type: shared_disk Access Mode: scsi3 Hosts (enabled): phys-schost-2, phys-schost-3
You do not need to be in the root role to list the quorum configuration. You can assume any role that provides solaris.cluster.read RBAC authorization.
Note - When you increase or decrease the number of node attachments to a quorum device, the quorum vote count is not automatically recalculated. You can reestablish the correct quorum vote if you remove all quorum devices and then add them back into the configuration. For a two-node cluster, temporarily add a new quorum device before you remove and add back the original quorum device. Then remove the temporary quorum device.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
Example 6-8 Listing the Quorum Configuration
% clquorum show + === Cluster Nodes === Node Name: phys-schost-2 Node ID: 1 Quorum Vote Count: 1 Reservation Key: 0x43BAC41300000001 Node Name: phys-schost-3 Node ID: 2 Quorum Vote Count: 1 Reservation Key: 0x43BAC41300000002 === Quorum Devices === Quorum Device Name: d3 Enabled: yes Votes: 1 Global Name: /dev/did/rdsk/d20s2 Type: shared_disk Access Mode: scsi3 Hosts (enabled): phys-schost-2, phys-schost-3
Use this procedure to replace a malfunctioning quorum device.
The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.
This procedure provides the long forms of the Oracle Solaris Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical.
Note - If the device you intend to remove is the last quorum device, you might want to first add another disk as a new quorum device. This step assures a valid quorum device if a failure occurs during the replacement procedure. See Adding a Quorum Device to add a new quorum device.
See How to Remove a Quorum Device to remove a disk device as a quorum device.
To replace the disk device, see the procedures for the disk enclosure in the hardware guide. See also the Oracle Solaris Cluster 4.1 Hardware Administration Manual.
See Adding a Quorum Device to add a disk as a new quorum device.
Note - If you added an additional quorum device in Step 1, it is now safe to remove it. See How to Remove a Quorum Device to remove the quorum device.
A default 25–second time-out exists for the completion of quorum operations during a cluster reconfiguration. You can increase the quorum time-out to a higher value by following the instructions in How to Configure Quorum Devices in Oracle Solaris Cluster Software Installation Guide. Rather than increasing the time-out value, you can also switch to a different quorum device.
Additional troubleshooting information is available in How to Configure Quorum Devices in Oracle Solaris Cluster Software Installation Guide.
Note - For Oracle Real Application Clusters (Oracle RAC), do not change the default quorum time-out of 25 seconds. In certain split-brain scenarios, a longer time-out period might lead to the failure of Oracle RAC VIP failover, due to the VIP resource timing out. If the quorum device being used is not conforming with the default 25–second time-out, use a different quorum device.
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