Microsoft Windows Server 2003 Cluster Server Integration

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HP OpenView Storage Data Protector 5.5

Microsoft Windows Server 2003

Cluster Server Integration

Executive Summary .............................................................................................................................. 3

Solution Description ............................................................................................................................. 4

MSCS Components .......................................................................................................................... 4

High Availability of the Data Protector Cell Manager ........................................................................... 4

Example Setup of Data Protector Cluster ............................................................................................. 4

Installation .......................................................................................................................................... 6

Support Matrices.............................................................................................................................. 6

Software Removal ............................................................................................................................ 6

Cell Manager .................................................................................................................................. 6

Client ............................................................................................................................................. 7

Password Change of Data Protector User Account ............................................................................... 7

Debug and Log Files......................................................................................................................... 8

Patches............................................................................................................................................... 9

Cell Manager .................................................................................................................................. 9

Client ............................................................................................................................................. 9

Configuration.................................................................................................................................... 10

Automatic Restart of Backups........................................................................................................... 10

Load Balancing at Failover.............................................................................................................. 11

Autoconfiguration of Backup Devices................................................................................................ 11

Busy Drive Handling....................................................................................................................... 15

Cluster Recovery................................................................................................................................16

Cluster Disks.................................................................................................................................. 16

Debug and Log Files....................................................................................................................... 17

Automated System Recovery (ASR)....................................................................................................... 18

Cluster Backup............................................................................................................................... 18

Hardware Documentation ............................................................................................................... 18

ASR Set ........................................................................................................................................ 18

DHCP and DNS............................................................................................................................. 19

Restore Modes............................................................................................................................... 19

Summary of content (32 pages)

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HP OpenView Storage Data Protector 5.5 Microsoft Windows Server 2003 Cluster Server Integration Executive Summary .............................................................................................................................. 3 Solution Description ............................................................................................................................. 4 MSCS Components .......................................................................................................
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Online ...................................................................................................................................... 19 Offline ...................................................................................................................................... 19 Local......................................................................................................................................... 19 Process Flow...............................................................
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Executive Summary This white paper provides complementary information for how to configure and maintain HP OpenView Storage Data Protector 5.5 in Microsoft Windows Server 2003 Cluster Server environments.
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Solution Description As a part of its high-availability functionality and support, Data Protector provides an integration solution with the Microsoft Cluster Server (MSCS). MSCS Components The MSCS consists of the following components: • Cluster nodes • Local disks • Shared disks • Groups • Resources Cluster nodes are computers that compose a cluster. They are physically connected to one or more shared disks.
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Figure 1.
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Installation Support Matrices Before installation, please check the latest support matrices for Data Protector and Microsoft Cluster Server at the following links: HP OpenView Storage Data Protector http://www.hp.com/go/dataprotector Products Designed for Microsoft Windows – Windows Catalog and HCL http://www.microsoft.com/whdc/hcl Software Removal If a system in the cluster has the Data Protector software already installed, you need to uninstall it before the setup.
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Client The Data Protector client software cannot be push-installed to the nodes of a Microsoft Cluster Server. Therefore, the client software must be locally installed. The Data Protector client installation does not propagate to other cluster nodes. The installation procedure requires client installations on every cluster node. During installation, Data Protector will recognize the cluster and install the client in the cluster-aware mode. The cluster integration component is selected by default.
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Debug and Log Files Setup.exe (csetup.exe) automatically writes a detailed installation log to “OB2DBG*.TXT”. These log files contains complete information on setup except on the part where dialogs are being displayed (technical limitation of MSI itself). Details: \OB2DBG___setup_.txt (debugging ID) is the process ID of the first process that accepts the debugging parameters. This ID is used as an ID for the debugging session. All further processes will use this ID.
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Patches Cell Manager Cluster patches must be locally installed. It’s the same procedure as the Data Protector software installation. Patches can be installed on any node, which will be simultaneously distributed to any other node. Note: CORE and CS patches may require a reboot, which could result in a failover of the Cell Manager. Please check the patch description in advance.
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Configuration First, please check chapters Pre-Installation Requirement of File Share Resource and Post-Installation Check of Resource Dependencies for known issues. Then, follow the instructions in the HP OpenView Storage Data Protector 5.5 Installation and Licensing Guide. The following figure shows the two-node cluster CLNODE2 with belonging resources. Please note that “Disk E:” is destined to hold the shared Data Protector software and configuration.
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Load Balancing at Failover If a failover causes a move of applications to that system where the Data Protector Cell Manager is running, it can result in a very high load on that system. Therefore, it might be necessary to abort running backup sessions in order to have enough system resources for the applications. It is possible to: • Abort all running backup sessions. • Abort specific running backup sessions. • Inhibit the Data Protector cluster Cell Manager for a specific timeframe.
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The next figures show an example how to autoconfigure a HP MSL5000 library. In the Scoping Pane, right-click Devices and click Autoconfigure Devices to open the wizard: Figure 5. Device Autoconfiguration Wizard - Start Select the client system by its virtual hostname, which will execute the autoconfiguration on the active node: Figure 6.
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Please note that any device can be accessed from two paths, which is caused by two installed host bus adapters (HBA). Select the tape library with all required tape drives: Figure 7. Device Autoconfiguration Wizard - Devices Please enable wizard option “Automatically discover changed SCSI address”: Figure 8.
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The following figure shows the final library robotics configuration. The robotics can be accessed via the virtual hostname and two different paths (multipath). Figure 9. Final Library Configuration The next figure shows the final configuration of library drive COMPAQ:SDLT320_1. The drive can be accessed via the virtual hostname and two different paths (multipath). Figure 10.
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Busy Drive Handling Libraries in clustered environments are managed by the active cluster node and the virtual hostname. If the active cluster node fails during a backup, the tape drive could not be unloaded due to an aborted and failing media agent. The next backup going to that drive will recognize an already loaded tape and fail. This can be prevented by setting an appropriate busy drive option.
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Cluster Recovery This chapter describes some common scenarios, which can be manually fixed and don’t require an Automated System Recovery (ASR). Cluster Disks Shared disks use the disk signature to identify a disk and to map the real device to a physical disk resource. When a physical disk resource fails and is replaced, the signature of the newly formatted disk no longer matches the signature stored by the physical disk resource.
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Figure 13. Server Cluster Recovery Utility – Select Disk Resources To complete the replacement, the new disk resource should be brought online and the drive letter should be changed with the disk management snap-in to match the old disk resource (this is necessary because applications typically reference files on the disk via a drive letter).
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Automated System Recovery (ASR) Automated System Recovery is a complex process and must be well organized. It is not sufficient to backup the environment. To be prepared for the real disaster, the disaster recovery process must be executed and verified in advance. Important issues are complete backups, appropriate network settings and correct drivers for mass storage controllers - particularly missing HBA drivers will prevent ASR from recognizing and recreating shared disks.
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DHCP and DNS For online ASR, DHCP must be additionally configured, though Microsoft cluster network interfaces must be configured with static IP addresses. DHCP must enable DNS Server, which resolves exactly all involved servers into correct full-qualified hostnames. E.g., online ASR will even fail if only the domain is different. If DHCP and DNS fail, the ASR offline restore mode is executed.
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The following figure describes major steps of ASR: Figure 14. Simplified ASR Process Flow Boot from Windows Server 2003 CD Select ASR Mode Apply Drivers Insert ASR Diskette #1 Format of Target Disk (C:) Reboot Windows Server 2003 Installation Format of Critical Volumes omnidr.exe DR wizard Insert all ASR diskettes drstart.exe ASR Data Protector Restore of Critical Data • File Protection Catalog • Filesystem and IDB • Windows Configuration Reboot The next list describes the ASR steps in detail: 1.
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11. If prompted, re-insert the ASR floppy disk. 12. ASR automatically reboots. 13. Remove the ASR floppy disk, which will later cause the DR process to stop and to offer additional options (Registry Editor, Command Window, Task Manager, Debug, Install Only). 14. The ASR starts the preparation of the operating system installation, which takes a couple of minutes. 15. In the preparing installation step and immediately after installing devices and network, all cluster disks are automatically formatted.
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Known Issues Pre-Installation Requirement of File Share Resource File Share Dependencies The resource, where Data Protector has to be installed, must have the following resources set among the dependencies (as described in the HP OpenView Storage Data Protector 5.
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The following figure shows the corrected permissions for file share resource DPSHARE: Figure 16.
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Post-Installation Check of Resource Dependencies After installation, check the following resources for correct dependencies: Figure 17. Dependencies of OBVS_MCRS Figure 18.
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Figure 19. Dependencies of OmniBack Share Figure 20.
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Tape Devices and Failover Tape devices connected to cluster nodes and its loaded media require additional attention after failover. Note: If a failover during backup activity occurs, the Data Protector may not be able to properly abort the session. Data may not be completely written which results in the corruption of the medium. It is highly recommended to restart the belonging backup session. Cluster Database Restore Two major problems are known: 1.
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hardware documentation is required to determine the correct path. If a wrong device is chosen, ASR will fail and the process must be repeated. ASR and Outdated SCSITAB If you are using a locally attached device for ASR, test if it’s supported. E.g., if the original DP 5.5 released SCSITAB-file was updated with information for the library used for the disaster recovery process, it must be copied to the first ASR disk. Please check in the HP OpenView Storage Data Protector 5.
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255 -spt 63 -bps 512 -layout 1141165761 -partcount 4” In this example, disk 2 would be the searched disk. 4. In the CMD-window, execute: “\WINDOWS\system32\bin\diskpart.exe”. - List all disks, e.g.: “DISKPART> list disk” - Select the correct disk with the determined disk number, e.g.: “DISKPART> select disk 1” - Create a partition, e.g.: “DISKPART> create partition primary”. - Assign a drive letter, e.g.
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Tools Microsoft Windows Server 2003 Resource Kit Tools The resource kit contains tools, which allows fixing cluster problems. E.g., ClusterRecovery helps to recreate shared disks and resource checkpoints. Please check the Microsoft documentation for use cases and appropriate tools. Microsoft Windows Server 2003 Resource Kit Tools http://www.microsoft.
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Summary This white paper describes the Microsoft Windows Server 2003 Cluster Server integration issues of HP OpenView Storage Data Protector 5.5. Installation, software maintenance (patches), configuration and cluster recovery issues are covered with examples. Additionally, known issues are documented for avoiding common problem cases. The described limitations and notes should be very well considered.
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For more information HP OpenView Storage Data Protector http://www.hp.com/go/dataprotector HP OpenView Storage Data Protector 5.5 Guides http://ovweb.external.hp.com/lpe/doc_serv HP OpenView Storage Data Protector v5.5 Support Matrices http://www.openview.hp.com/products/datapro/spec_0001.html Windows Server 2003 http://www.microsoft.com/windowsserver2003 Microsoft TechNet http://www.microsoft.com/technet Guide to Creating and Configuring a Server Cluster under Windows Server 2003 http://www.