HP 3PAR Cluster Extension Software Administrator Guide Abstract This guide contains detailed instructions for configuring and troubleshooting HP 3PAR Cluster Extension Software in Microsoft Windows environments. The intended audience has independent knowledge of related software and of the HP 3PAR storage system and its software.
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Contents 1 HP 3PAR Cluster Extension features...............................................................6 Integration into cluster software (Graphical user interface)..............................................................6 CLI for easy integration..............................................................................................................6 Disaster tolerance through geographical dispersion.......................................................................
Setting HP 3PAR Cluster Extension resource properties using the GUI........................................27 Using Failover Cluster Management to set resource properties.............................................27 Using Failover Cluster Management to set resource properties of a CLX resource on which a CSV disk is dependant (Windows Server 2012 and Windows Server 2012 Server Core)........28 Using the resource configuration tool to set resource properties ..........................................
Pre-execution return codes...................................................................................................68 Post-execution return codes..................................................................................................68 5 Troubleshooting........................................................................................69 Logs......................................................................................................................................
1 HP 3PAR Cluster Extension features HP 3PAR Cluster Extension offers protection against application downtime due to a fault, failure, or site disaster by extending a local cluster between data centers over metropolitan distance. HP 3PAR Cluster Extension reinstates critical applications at a remote site within minutes of an adverse event, integrating your open-system clustering software and HP 3PAR Remote Copy to automate failover and failback between sites.
Figure 1 Physical replication using HP 3PAR Remote Copy HP 3PAR Remote Copy-mirrored disks have a read/write-enabled primary (local) disk and a read-only secondary (remote) disk. Current cluster software products cannot distinguish between read-only and write-enabled disks, and cannot enable disk access if the disk is not write-enabled during the server boot process.
Fully Automatic Failover and Failback Automated failover and failback reduces the complexity involved in a disaster recovery situation. It is protection against the risk of downtime, whether planned or unplanned.
1-to-1 configuration When setting up a one-to-one configuration (see Figure 2 (page 9)), consider the following: • Cluster nodes are split between two or more geographically dispersed data center sites and use redundant, diversely routed network connections for intra-cluster communications. Those links must be as reliable as possible to prevent false failover operations or split-brain situations.
N-to-1 and 1-to-N configurations NOTE: The restrictions outlined in “1-to-1 configuration” (page 9) also apply to N-to-1 configurations. When setting up an N-to-1 or 1-to-N configuration (see Figure 3 (page 10)), consider the following: • HP 3PAR Cluster Extension uses the unit of Remote Copy volume groups as the failover unit. This means all virtual volumes or members of a Remote Copy volume group will be failed over if the cluster software moves disk access from one cluster node to another.
Figure 4 Relationship of primary versus secondary volume groups on primary and backup storage servers Remote Copy pairs Remote Copy configurations are based on the relationship between a storage system pair, also known as the Remote Copy pair. Within this pair, the primary storage system is the system that holds the volumes that are copied to a backup or secondary storage system, also known as a remote storage system.
Synchronous replication Using synchronous mode, all write requests from the server are first transferred to the remote storage system. After each I/O has been mirrored in the cache area of the remote storage system, it is acknowledged to the local storage system. The write request is then acknowledged to the server. User configuration file HP 3PAR Cluster Extension provides a user configuration file to customize failover behavior.
This ensures that more than 50% of the nodes will have an up-to-date copy of the configuration information. The cluster service does not start (and bring resources online) if there are 50% or less of the configured nodes up and running. The cluster service waits, trying to restart, until a quorum is established when more nodes join. This feature guarantees that the cluster has the latest and most up-to-date configuration.
This will make your cluster work quicker. Additionally, CSV enables Live Migration which allows you to move a running VM from one node to another node with zero downtime. Since disk ownership no longer needs to change when a VM moves to another node, this makes the process quicker and safer, allowing clients to remain connected while the virtual machine is moved to another node in the cluster. The CSV disk resource which is owned by a cluster node is called as coordinate node.
Configuration tool (clx3PARconfig.exe) HP 3PAR Cluster Extension uses the configuration tool(clx3PARconfig.exe) to store configuration and access information for each configured management server. This tool stores information in the clx3parcfg file. However, because the clx3parcfg file cannot be edited with a standard text editor, management server entries can only be added, modified, and deleted using the configuration tool that is included with the standard installation of HP 3PAR Cluster Extension.
2 Configuring HP 3PAR Cluster Extension After installing HP 3PAR Cluster Extension, use the configuration tool to define the HP 3PAR Cluster Extension setup configuration. Use Failover Cluster Management (Windows Server 2008/2008 R2/2012), or cluster commands in the CLI or Microsoft Failover Cluster PowerShell Cmdlets to add and configure resources. Integrating HP 3PAR Cluster Extension with MSFC To integrate HP 3PAR Cluster Extension with MSFC: 1.
Defining the HP 3PAR configuration information using the GUI To define configuration information using the GUI: 1. Open the configuration tool. For instructions, see “Starting the HP 3PAR Configuration Tool” (page 16) 2. Click Add in the Array Configuration section to open the Add Array dialog box.
3. 4. Enter the Array Network Name. If you have a password file, click Browse to select the password file. If you don’t have a password file, select I don’t have a password file radio button and click Generate button to open HP 3PAR password file generator dialog box.
Provide the required information and click Generate button to generate new HP 3PAR password file for the given array. 5. • User: HP 3PAR user • Password: HP 3PAR password for the given user. • Password file name: The name of the password file that will be generated on clicking Generate button. This is an optional parameter; the default value will be _.pwd. • Password file path: The windows directory where the HP 3PAR password file needs to be created.
8. Select the servers that are possible owners of the HP 3PAR Cluster Extension-managed disks, and click OK. NOTE: See the Microsoft Windows Clustering documentation for more information about possible owners. 9. Click OK. You will be prompted to confirm if you want to automatically copy the configuration file on all the cluster nodes used by Cluster Extension. a. If you select Yes, the configuration information is automatically copied to all cluster nodes used by Cluster Extension.
1. Use the following command to add arrays: clx3PARconfig ARRAY /ADD [{NAME=PWF=}] [{NAME=PWF=}]...] 2. Use the following command to add the available cluster nodes: clx3PARconfig SERVER /ADD [NAME=servername] [NAME=servername...] 3. Use the procedures in “Importing and exporting configuration information” (page 21) to copy the configuration information to the other cluster nodes.
To use 3PAR Cluster Extension, you must add an HP 3PAR Cluster Extension resource in the cluster management application. Follow one of the following ways to add CLX 3PAR Cluster Extension resource. • Use the Failover Cluster Management GUI or cluster commands in the CLI or PowerShell Cmdlets. For instructions, see “Adding HP 3PAR Cluster Extension resource using the Failover Cluster Management GUI” (page 22) or “Adding HP 3PAR Cluster Extension resource using cluster.
cluster resource clx_fileshare /create /group:CLX_SHARE /type:"Cluster Extension 3PAR" Adding HP 3PAR Cluster Extension resource using the Microsoft Failover Cluster PowerShell Cmdlets NOTE: On Windows Server 2012 Server Core, Failover Cluster PowerShell interface is not enabled by default when the Failover Cluster feature is enabled. User should explicitly enable this feature for using the PowerShell Cmdlets.
Before configuring HP 3PAR Cluster Extension resources, review the HP 3PAR Cluster Extension objects described in “User configuration file and HP 3PAR Cluster Extension objects” (page 47). NOTE: User does not need to configure resources of type "Cluster Extension 3PAR for VM Management". Only resources of type "Cluster Extension 3PAR" needs to be configured for the storage disks.
Table 1 Setting resource properties and values in the GUI Property Format Description Thorough Resource Health Check Interval ) Integer Used to poll “Alive” state for GUI: 01:00 mm:ss (Default) the resource. Also used by CLI: 60000 milliseconds HP 3PAR Cluster Extension (Default) to perform HP 3PAR Remote Copy start operations if auto_recover policy is set for a particular Remote Copy volume group. Decreasing this value allows faster resource failure detection but also consumes more system resources.
Table 1 Setting resource properties and values in the GUI (continued) Property Format Description Value Windows Clustering (MSFC)” (page 41). Set this value in the Policies tab of the resource properties window in Failover Cluster Management. HP 3PAR Cluster Extension requirements for service or application properties are described in Table 2 (page 26). If no specific value is required, the default value is listed.
Table 2 Service or application properties and values (continued) Property Format Description Value If this value is set to a number higher than the current number of clustered systems for the cluster group, the service or application will continue to restart until either the FailoverThreshold value or the FailoverPeriod timeout value is reached. Setting HP 3PAR Cluster Extension-specific resource properties Changes to resource properties take effect when the resource is brought online again.
4. Make the necessary parameter changes, and then click OK. Using Failover Cluster Management to set resource properties of a CLX resource on which a CSV disk is dependant (Windows Server 2012 and Windows Server 2012 Server Core) In case of a CSV disk, it is possible to create a CLX resource in the CSV group and make CSV disk dependent on the CLX resource. After creating the CLX resource in the CSV group, the CLX resource does not appear in the Windows Server 2012 Failover Cluster Manager GUI.
4. Make the necessary parameter changes, and then click OK. NOTE: HP 3PAR CLX Settings tab in the properties window of a CSV disk is visible only if that CSV disk is dependant on a "Cluster Extension 3PAR" resource. Alternatively, users can also use HP 3PAR Resource Configuration Tool (Clx3PARResConfig.exe) to configure the CLX resource on which the CSV is dependent.
NOTE: In Server Core and Hyper V Server, users can only use the CLX3PARRESCONFIG.EXE as the GUI is not present. Configuring cluster node data center assignments To configure cluster node data center assignments from the cluster software Parameters tab or the resource configuration tool: 1. To add a cluster node: a. Click Add to open the Add Server Data center Assignment window. b. c. d. 2. 30 Select a cluster node from the Pre-Configured host list.
3. 4. To modify a cluster node, select the node, and then click Modify. Click Apply to finish your modifications and leave the window open, or click OK to save your changes and close the Properties window. Configuring HP 3PAR storage system To configure HP 3PAR storage systems from the cluster software Parameters tab or the resource configuration tool: 1. To add a storage system: a. Click Add to open the Add Array Data center Assignment window. b. c. d. 2. 3. 4.
Selecting a volume group Use the cluster software Parameters tab or the resource configuration tool to select the Remote Copy volume group containing the disk that will be managed by the HP 3PAR Cluster Extension resource. 1. Click Browse. 2. 3. Select a volume group, and then click OK. Click Apply to finish your modifications and keep the window open, or click OK to save your changes and then close the Properties window.
3. If you selected RESYNCWAIT in Step 2, set the RESYNCWAIT timeout value. • 4. 5. 6. 7. Enter the RESYNCWAIT timeout value, in seconds. Select YES or NO as the UseNonCurrentDataOk value in the Replication link down scenario section. Enter the path of the application directory. The application directory is where HP 3PAR Cluster Extension searches for application-specific files, such as the force flag or online file. Click OK to save your changes and close the Advanced settings window.
NOTE: When you configure HP 3PAR Cluster Extension resource properties using the CLI, the properties you enter are not validated, so you must enter the property values accurately, and verify them against the HP 3PAR Cluster Extension documentation.
3. Update the file with the property values you want to use. For more information on the available properties, see “User configuration file and HP 3PAR Cluster Extension objects” (page 47). 4. 5. Save the file and copy it to the following directory on all cluster nodes: %ProgramFiles%\ Hewlett-Packard\Cluster Extension 3PAR\conf. Bring the HP 3PAR Cluster Extension resource online.
6. Click OK to add the selected dependency. Adding dependencies using the CLI The cluster commands in this section can be used with Server Core or Hyper-V Server.
Configuration of HP 3PAR CLX for CSV disk on Windows Server 2012 Configuration of CLX resource for the CSV disk is a two steps process. This is almost similar to the configuration of CLX for non CSV disk. • Creation of CLX resource in the CSV Role CSV disk resides in its own role in the Failover Cluster. CSV disk is visible in the Failover Cluster Manager GUI but the role in which the CSV disk resides is not visible to the user.
Figure 5 Service or application example Figure 6 Resource tree for service or application CLX_SHARE HP 3PAR Cluster Extension is configured as a single resource to enable read/write access to the physical disk resource used for the CLX_SHARE cluster group. The physical disk resource depends on the HP 3PAR Cluster Extension resource and can be brought online only when the HP 3PAR Cluster Extension resource is already online.
1. 2. 3. 4. 5. 6. 7. 8. Log in to the host3_DCB system with the Administrator account. Create the file share service or application with all previously mentioned resources and its dependencies, except the HP 3PAR Cluster Extension resource on host3_DCB. Create a new resource of type HP 3PAR Cluster Extension and add systems host2_DCA, host3_DCB and host4_DCB to its possible owners.
To bring resources online: • Use Failover Cluster GUI or Cluster CLI or Microsoft PowerShell Cmdlets. • For Server Core or Hyper-V Server, use the CLI or the MMC or Microsoft PowerShell Cmdlets. For more information on using this command, see your Microsoft documentation. Taking a resource offline Resources are usually taken offline automatically when the service or application is taken offline. Taking a resource offline causes resources that depend on that resource to go offline.
Timing considerations for Windows Clustering (MSFC) HP 3PAR Cluster Extension gives priority to storage system operations over cluster software operations. If HP 3PAR Cluster Extension is invoked during a virtual volume synchronization/full synchronization operation, or is gathering information about the remote storage system, it waits until the requested status information is reported. This ensures the priority of data integrity over cluster software failover behavior.
The generated password file is stored in the directory from where the command shell is launched. For example, if you use %HP 3PAR CLI PATH% to login to the command shell, the generated password file location will be \bin. IMPORTANT: If there is any change in the configured IP address of the array or password file location and content, Cluster Extension will fail to communicate with the array and will not perform the required actions.
users can use the CLX resource configuration utility integrated with CSV cluster resource in the Failover Cluster or use the HP 3PAR Resource Configuration Tool (Clx3PARResConfig.exe) to configure the CLX resource for CSV disk. System resources Monitor the system resources on a regular basis as part of Windows administration. If any system resource usage by the cluster service is reaching maximum levels, stop and then restart the cluster service.
If the highly available VMs are running on a cluster node which is in a different datacenter then the VMs will run in the redirected-access mode. This is because, the replicated disk in the datacenter where VM is running is usually presented to the cluster node as read-only on the storage array. Which means the I/O operations of the VMs on to the CSV disk is carried over the IP network to the coordinated node in the other datacenter and the coordinated node will take care of committing the I/O to the disk.
1. Create a cluster resource of resource type “Cluster Extension 3PAR for VM Management” in the VM Role. NOTE: Corresponding CSV is dependant on CLX. Example: Using the PowerShell Add-ClusterResource -Name VM_MGMT_Res -Group VM4_2k12 -ResourceType "Cluster Extension 3PAR for VM Management" 2. Set the dependency of VM configuration resource on the newly created resource of resource type “Cluster Extension 3PAR for VM Management”.
selected from that list. The selected cluster node should be up. If not, search will continue in the list until a cluster node is found in the remote datacenter. Preferred Owners is completely set: Since all cluster nodes are part of the next preferred owner node property list, the next preferred owner node will be selected from this list. The selected cluster node should be up and should be in the same datacenter as the datacenter where CSV disk is owned.
3 User configuration file and HP 3PAR Cluster Extension objects Objects (also called properties in this document) define the HP 3PAR storage system environment and failover/failback behavior. You can customize HP 3PAR Cluster Extension objects in the user configuration file or in the cluster software. User configuration file For the CLI implementation of HP 3PAR Cluster Extension, the user configuration file UCF.cfg is used to configure application service-specific information. UCF.
Specifying object values You do not need to change the default settings unless you want to change the degree of protection for your Remote Copy volume group members. If you change an object, you may need to change additional objects as well. For example, if RESYNCWAIT has been specified for the ApplicationStartup object, the ResyncWaitTimeout object must be specified. Objects are supported according to the requirements or capabilities of the cluster software, as indicated in Table 3 (page 48).
COMMON Format tag Description Distinguishes between general (common) and application-specific objects. LogDir Format String Description (Optional) Defines the path to the HP 3PAR Cluster Extension log file. Default value %ProgramFiles%\Hewlett-Packard\Cluster Extension 3PAR\log LogLevel Format String Description (Optional) Defines the logging level used by HP 3PAR Cluster Extension. Valid values error (default): Logs only error messages for events that are unrecoverable.
If ApplicationDir is not set, HP 3PAR Cluster Extension uses the local %HPCLX_3PAR_PATH% values as defined in the registry. Default values %HPCLX_3PAR_PATH% Files application_name.forceflag CLX_application_name.online If specified in a user configuration file, resource_name is the value of the APPLICATION tag; otherwise, resource_name is the value of the HP 3PAR Cluster Extension resource name.
The cluster group is brought online in the remote data center (if possible) without waiting for resynchronization. The application startup process is stopped locally and HP 3PAR Cluster Extension reports a data center error. Depending on the cluster software, the application service cannot start on any system in the local data center, and the cluster software transfers the application service back to the remote data center. Use this value to provide the highest level of application service availability.
DC_A_ InServStorage_SerNum (Required) Format String Description The serial number of the HP 3PAR storage system located in data center A. DC_B_ InServStorage_SerNum (Required) Format String Description The serial number of the HP 3PAR storage system located in data center B. RCVolumeGroupA (Required) Format String Description HP 3PAR Remote Copy volume group name on configured DCA HP 3PAR storage system, containing the application service disk set.
Do not specify arguments to be passed to the executable. ResyncWaitTimeout (Optional) Format Integer Description Specifies the value (in seconds) for checking the status of the Remote Copy volume group resynchronization. It might take some time to resynchronize member virtual volumes. You can set this value if the ApplicationStartup property is set to RESYNCWAIT.
# The APPLICATION part defines failover information for the application specified # as value of the APPLICATION tag. For example, the command - clx3PARrun CLXSer # will use the below settings to check and allow access to the disk set specified # as volume Group CLX_VG.
4 CLI commands and utilities Using its CLI and command-line utilities, HP 3PAR Cluster Extension can be integrated with almost any cluster software. CLI commands The HP 3PAR Cluster Extension CLI command clx3PARrun can be: • Used as a standalone utility • Integrated into any cluster software or custom application clx3PARrun Description Use clx3PARrun to manually prepare the application service's disk set before an existing application service start procedure is invoked.
Related information • clx3PARrun expects only the app_name parameter, which uniquely identifies an application service in the APPLICATION section of the user configuration file. • To force a Remote Copy volume group failover, use the –forceflag option. CAUTION: The forceflag option is an emergency switch used to manually activate your virtual volume.
Installing HP 3PAR InForm Command Line Interface (CLI) HP 3PAR Cluster Extension communicates with the HP 3PAR storage system using the HP 3PAR InForm Command Line Interface (CLI). Ensure that you install the supported version of HP 3PAR Command Line Interface (CLI) on a host where clx3PARrun can be used. Creating and configuring the user configuration file The CLI expects as an argument the name configured as the APPLICATION tag value.
HP 3PAR storage system and the settings in the UCF.cfg file, you must evaluate the following considerations: • HP 3PAR Cluster Extension uses HP 3PAR Command Line Interface (CLI) to communicate with the HP 3PAR storage system, depending on the settings of HP 3PAR command timeout property, and the number of Remote Copy volume groups managed by HP 3PAR storage systems, the online operation could time out.
Another way to unload the CLX PowerShell Snap-In is to run the PowerShell script RemoveClx3PARCmdletsSnapIn.ps1 located at \bin directory. NAME: Add-CSVDependencyOnCLX3PAR SYNOPSIS: Adds a cluster resource of type "Cluster Extension 3PAR" to the list of resources and makes the given cluster shared volume dependent on this cluster resource (CLX resource), using AND as the connector, within a failover cluster. Existing dependencies will remain in the list.
Does not accept input objects. OUTPUTS: Does not return object. NOTES: CSV resource has to be offline while trying to add the dependency. The Confirm parameter and the Force switch parameter are provided. The cmdlet performs the operations irrespective of the storage array type of CSV. Online help for the cmdlet is not supported. Example 1 C:\PS>Add-CSVDependencyOnCLX3PAR This command first finds out all the cluster shared volumes in the cluster.
Created the resource "CLX_3PAR_Cluster Disk 2" in CSV Owner Group: "0f145465-1186-4bbb-b9e2-2fde4cb1127d" Added the dependency of CSV: "Cluster Disk 2" on "Cluster Extension 3PAR" type resource: "CLX_3PAR_Cluster Disk 2" Resource of type "Cluster Extension 3PAR" to be created with Name: "CLX_3PAR_Cluster Disk 3" in CSV Owner Group: "a71654bf-6c77-42c1-95dd-025ea8c4f225" Created the resource "CLX_3PAR_Cluster Disk 3" in CSV Owner Group: "a71654bf-6c77-42c1-95dd-025ea8c4f225" Added the dependency of CSV: "Clu
"Cluster Extension 3PAR" type resource. If it is not present, a new resource of type "Cluster Extension 3PAR" is created and CSV resource is made dependent on it. While creating the dependency, CSV resource should be offline, else dependency is not created. PS C:> Add-CSVDependencyOnCLX3PAR -CSVDiskName "Cluster Disk 1" Logs will be generated with default "info" log level. For changing the logging level, configure LogLevel parameter in UCF.
"Virtual Machine Configuration" resource is already dependent on the CLX resource, the cmdlet moves to the next VM configuration on a CSV. In the absence of dependency on the existing CLX resource the cmdlet creates a dependency of "Virtual Machine Configuration" resource in the VM role on resource of type "Cluster Extension 3PAR for VM Management".
If virtual machine configuration is already dependent on "Cluster Extension 3PAR for VM Management", then the cmdlet moves to the next virtual machine configuration on a CSV. However if there is no existing dependency on "Cluster Extension 3PAR for VM Management" but resource of this type is already existing in the VM role, virtual machine configuration resource is made dependent on the existing "Cluster Extension 3PAR for VM Management" type resource.
cluster shared volume, it tries to make each virtual machine configuration resource dependent on resource of type "Cluster Extension 3PAR for VM Management". If virtual machine configuration is already dependent on "Cluster Extension 3PAR for VM Management", then the cmdlet moves to the next virtual machine configuration on the provided CSV.
SYNOPSIS: Gets the list of virtual machines which reside on a cluster shared volume. SYNTAX: Get-VMOnClusterSharedVolumeListForCLX3PAR [-CSVDiskName [] DESCRIPTION: This cmdlet tries to get the list of all virtual machines which reside on a CSV. If the CSV name is specified, then the virtual machines which reside on that particular CSV are only listed.
Total virtual machines in the cluster on cluster shared volumes: 1 Total virtual machines in the cluster: 1 Example 2 C:\PS>Get-VMOnClusterSharedVolumeListForCLX3PAR -CSVDiskName "Cluster Disk 1" In this example, the cmdlet lists all the virtual machines which reside on CSV "Cluster Disk 1" PS C:\> Get-VMOnClusterSharedVolumeListForCLX3PAR -CSVDiskName "Cluster Disk 1" Cmdlet Log Location: C:\Program Files\Hewlett-Packard\Cluster Extension 3PAR\log\CLXCmdlet.
14. 15. 16. 17. Remote Copy volume group virtual volume status AutoRecover Application directory path (ApplicationDir object) Log file location (LogDir object) Pre-executables and post-executables must supply a return code. The return code is used to determine whether a failover function is called. Pre-execution return codes Pre-execution return code Text Description 0 PRE_OK_TAKEOVER Pre-executable OK and failover action allowed.
5 Troubleshooting To troubleshoot problems with HP 3PAR Cluster Extension, one must understand HP 3PAR Remote Copy environments. See the Remote Copy User's Guide for more information on Remote Copy configuration and volume group states. See the HP 3PAR Cluster Extension log for any cluster specific information. However, it always keeps its own log files in its default log location.
HP 3PAR Cluster Extension logs The logging module of HP 3PAR Cluster Extension provides log messages to the cluster software and to the HP 3PAR Cluster Extension log file. The HP 3PAR Cluster Extension log file includes Remote copy volume group status information. By default, the HP 3PAR Cluster Extension log file is located in the %ProgramFiles%\ Hewlett-Packard\Cluster Extension 3PAR\log\ directory.
In the current example, the state of the local Remote Copy (RC) group is “primary” (virtual volumes having read/write access) and the state of the remote RC group is “secondary” (virtual volumes having read-only access). The RC link status is UP and the replication status is started. Line 30: The status of the Cluster Extension takeover action. Line 31: The encoded Cluster Extension execution path. Line 32: Online status of Cluster Extension resources. Line 33: Creating .
Error return codes Description Copy replication using HP 3PAR Management GUI or CLI when required. Replication I/O starting error Replication I/O between the primary and secondary Remote Copy volume group is started. Use HP 3PAR Management GUI or CLI to check if the replication status is started or not. You can manually start the Remote Copy replication using HP 3PAR Management GUI or CLI when required.
Failover error handling Windows Cluster automatically fails over resource groups if the system where resource group is running on becomes unavailable. This is part of the cluster functionality. Also, this means that if a problem occurs with the HP 3PAR storage system, a resource group online process will be stopped. The behavior of HP 3PAR Cluster Extension is highly configurable.
Later, when the power outage in the primary datacenter is corrected and the storage array is brought back online, the status of the remote copy volume group goes to the failsafe status. At this time, if we failback the corresponding cluster application role from the secondary datacenter to one of the hosts in the primary datacenter, then the physical disk resources may fail to come online even though CLX resource has come online successfully.
Resource disk failure when HP 3PAR Cluster Extension is online In a cluster resource group, if the Cluster Extension resource is online but dependent disk resource is failing: • Ensure that the fibre channel connectivity between the servers and the storage systems is up and running. • Verify that the disk resource is dependent to the Cluster Extension resource.
Continuing to write changes despite a broken link leads to a loss of synchronization between primary and secondary Remote Copy volume groups. The no_fail_wrt_on_err policy is used when you would rather keep the applications that are writing the data running, even when the Remote Copy has failed and become out of sync. After the error that caused the broken link is resolved, you must manually restart the Remote Copy operation between the members of the Remote Copy pair to bring the Remote Copy in sync again.
3PAR CLX Setting tab will not be visible, if the CSV disk dependency on the CLX resource is not set.
6 Support and other resources Contacting HP For worldwide technical support information, see the HP support website: http://www.hp.
• http://www.hp.com/support/downloads • http://www.hp.com/storage/whitepapers Typographic conventions Table 4 Document conventions Convention Element Blue text: Table 4 (page 79) Cross-reference links and e-mail addresses Blue, underlined text: http://www.hp.
Glossary 3PAR Remote Copy A product that allows you to copy virtual volumes from one HP 3PAR storage system to another. CLI Command-line interface. An interface comprised of various commands which are used to control operating system responses. cluster A group of controller nodes connected via the same storage server backplane. The nodes in a cluster operate as a unified system, separate from any other clusters that may share the same service processor. CLX Cluster Extension.
Index Symbols 3PAR Cluster Extension Features, 6 Integration, 6 Processes and components, 10 3PAR Remote Copy, 10 Volume groups, 11 A Adding HP 3PAR Cluster Extension resource, 21 Adding dependencies using CLI, 36 using Failover Cluster Management, 35 using PowerShell, 36 Administration, 42 APPLICATION objects, 49 ApplicationDir description, 49 ApplicationStartup description, 50 AutoFailbackType Description, 26 B Basic Resource Health Check Interval Description, 25 Bouncing service or application, 41 C C
I Importing Configuration information, 21 Integration CLI, 6 with cluster software, 6 IsAlivePollInterval Description, 25 L Live migration, 40, 43 LogDir description, 49 LogLevel description, 49 UCF requirement, 34 LooksAlivePollInterval Description, 25 M Microsoft Management Console, 24 Mirrored disks Automated redirection, 7 N New and changed information, 78 P PendingTimeout Description, 25 Post-execution programs, 67 Return codes, 68 PostExecCheck description, 52 PostExecScript description, 52 Pre-ex
HP , 78 Product manuals, 78 83
