installation and user’s guide hp StorageWorks NAS Data Path Manager installation and user’s guide Edition: March 2003 Part Number: A7423-96001
© Hewlett-Packard Company, 2003. Hewlett-Packard Company makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. This document contains proprietary information, which is protected by copyright.
contents Contents About this Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents Edit Selected Volume Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Delete Selected Volume Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Selected Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repair Volume Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset LUN Paths to Factory Settings . . . .
about this guide About this Guide This installation and user’s guide provides information to help you: ■ Install NAS Data PathAbout Manager software on your HP StorageWorks NAS this Guide 8000 system. ■ Understand data path management concepts. ■ Monitor and manage data paths on your NAS 8000. ■ Reinstall and reconfigure NAS Data Path Manager after system Disaster Recovery.
About this Guide Document Conventions This document uses the following formatting conventions included in Table 1.
About this Guide ■ Product model names and numbers ■ Applicable error messages ■ Operating system type and revision level (from Command View NAS Identity page) ■ Detailed, specific questions HP Storage Website The HP website has the latest information on this product, as well as the latest drivers. Access storage at: http://thenew.hp.com/country/us/eng/prodserv/storage.html. From this website, select the appropriate product or solution.
About this Guide 8 hp StorageWorks NAS Data Path Manager Installation and User’s Guide
NAS Data Path Manager 1 Product Overview HP StorageWorks NAS Data Path Manager is an optional software product you can purchase for the HP StorageWorks NAS 8000. It provides automatic path load balancing and failover for NAS 8000 servers configured with multiple host bus adapters (HBAs). The software allows you to customize your path settings, as needed, to obtain optimum performance from your storage system.
NAS Data Path Manager Note: Data Path Failover and failover packages are different NAS 8000 features. ■ Data Path Failover is the ability of your system to use alternate fibre-channel paths to get information to your storage in case all of the preferred paths fail. Data Path Failover can be installed and used on any NAS 8000 (version 1.6.0 or later) high availability (HA) or non-HA system, with the correct firmware revision. Please contact your HP Service Representative for firmware information or updates.
NAS Data Path Manager Product Components The NAS Data Path Manager product includes: ■ HP NAS Data Path Manager Installation and User’s Guide ■ NAS Data Path Manager Software CD ■ Software License Agreement Note: This guide is also on the NAS 8000 Documentation CD in PDF format.
NAS Data Path Manager Data Path Concepts Data paths exist wherever there are physical connections from an initiator (a NAS server HBA) to a target (an array controller). Data Path Manager manages traffic patterns among all available paths between the NAS server HBAs and the LUNs in your arrays. Figure 1: Preferred (optimal) and Alternate (non-optimal) Paths Each path is comprised of the HBA, controller, and any necessary networking hardware.
NAS Data Path Manager As a general rule, when a non-optimal path is used, the request is going from one HBA through a controller that communicates with the controller of the target LUN. Therefore, the data request goes through two controllers to get to the specific LUN, instead of just one. (This is true for all except XP controllers, for which all paths are considered optimal.) See paths to Controller 2 in Figure 1 on page 12.
NAS Data Path Manager Data Path Failover Data path failover occurs when all designated preferred paths fail between the NAS server and its storage device. NAS Data Path Manager splits data transfers among “good” (non-failed) preferred paths in a least-used pattern, as long as there are functioning preferred paths. If all preferred paths fail, NAS Data Path Manager directs the traffic to a designated alternate path so that normal operations continue without interruption.
NAS Data Path Manager Install NAS Data Path Manager Prerequisites See System Requirements on page 10. Install the Software Use the NAS Data Path Manager software CD and the command line interface to install NAS Data Path Manager. 1. On the NAS 8000 server, insert the CD into the server’s CD-ROM drive. 2. On a computer on the network, access the command line interface: a. On an MS Windows system, Select Start > Run. (This step is not necessary for UNIX/Linux systems.) b.
NAS Data Path Manager 4. Select Actions > Enable/Disable Application. 5. Click OK. The sample configuration, below, shows a multi-server, multi-array system using NAS Data Path Manager. Recommended connections from the fibre channel switches to the arrays are represented by solid lines; optional connections are represented by dashed lines.
NAS Data Path Manager Monitor Data Paths Check path configuration and performance using several methods. ■ Use Performance Monitor to Monitor HBAs ■ View Volume Groups for Path Information These topics are discussed in detail below. Use Performance Monitor to Monitor HBAs Use HP NAS 8000 Performance Monitor to: ■ View and Change Performance Monitor Settings. ■ Observe Data Path Performance. Note: Performance Monitor can show HBA, NFS, and CPU performance, depending on what you enable.
NAS Data Path Manager Figure 3: Performance Monitor window 1 . Performance Monitor Menu Bar 2 . Metric Actions Toolbar 3 . Enable/Disable Monitor 4 . Open Chart for Selected Item 5 . Clear Monitor History on Server 1 2 3 4 5 Figure 4: Performance Monitor Window Menu, Metric Actions Toolbar, and Icons 3. Click the Enable/Disable Monitor icon on the Metric Actions Toolbar to display the Configure Metrics window. 4. In the Enable Monitoring box: a. Check the box to enable monitoring. b.
NAS Data Path Manager You can also access the Performance Monitor Settings dialog box to change the settings by either of the following methods. ■ From Command View NAS, select Configuration > Alerts/Logging > Performance Monitor Settings, then Actions > Edit Performance Monitor Settings to view and change the monitoring settings. ■ From Command View NAS, select Configuration > Configuration Wizard > Actions > Launch Wizard. Then select Next to get the What do you want to configure? dialog box.
NAS Data Path Manager Note: Since Performance Monitor runs in a separate window, you can keep it open while you are making changes to your data path settings in Command View NAS, so you can view the impact of a change without exiting the path management session. You can view each chart in two modes; showing either real-time or historical data. View Real-time chart is the default view. This view shows the read rate and write rate (MB/sec) of the specified HBA.
NAS Data Path Manager View Volume Groups for Path Information The View Volume Groups window allows you to manage the relationship between system LUNs and volume groups to improve performance.
NAS Data Path Manager In the tree view, the volume groups are listed alphabetically by name unless you are on an HA system. On an HA system, the tree view displays package names first (listed alphabetically), then all volume groups that are not associated with a package. Figure 7: View volume group information in tree view Note: Each initiator (HBA) and target (controller) is identified by its world wide name (WWN) in the Volume Groups table. A WWN is a unique alpha-numeric identifier for hardware.
NAS Data Path Manager The relationship between the path modes and states provides you with important status information in a simplified way. Some of this information is self-explanatory; other mode/state combinations require explanation. The following table explains these relationships.
NAS Data Path Manager Create a New Volume Group To create a new volume group: 1. In Command View NAS, click the Storage tab. 2. Navigate to Volume Groups. 3. Select Actions > Create New Volume Group to bring up the Create New Volume Group dialog box. 4. Enter a name for your new volume group in the Volume Group Name field. 5. Select an appropriate LUN from the Available LUNs list and click OK to move the name to the Allocated LUNs list. 6. Continue to select and move LUNs, as appropriate. 7.
NAS Data Path Manager Delete Selected Volume Group To delete a volume group: 1. In Command View NAS, select the Storage tab, then select Volume Groups. Use either the Table or Tree view for this action. 2. Select the volume group to delete. 3. Select Actions > Delete Selected Volume Group. ■ If the Volume Group contains data, an error dialog box will appear, explaining what action must be taken before you can delete the volume group. Click OK to exit the dialog box.
NAS Data Path Manager To repair a volume group: 1. From the Storage tab, select Volume Groups. 2. Select the tree view. 3. Select the volume group to repair. 4. Select Actions. — In a dedicated attach configuration, select Repair Volume Group. — In an HA configuration, select Restart Failover Package for Selected Volume Group 5. Check the warning box and click OK. As part of the repair process, CIFS and NFS connections may be disrupted. For a dedicated system, the volume groups are then activated.
NAS Data Path Manager The volume groups are listed alphabetically by volume group name. In this view, you can create, edit, and delete volume groups; reset the LUN paths to factory settings; and refresh the view. Figure 8: Viewing volume groups Decide Whether to Manage the Data Paths If each of your HBAs is using less than half of its capacity or if your HBAs bear about the same amount of traffic, it is best to continue using the default settings.
NAS Data Path Manager Manage the Data Paths NAS Data Path Manager needs very little attention to function properly. However, to customize your paths to better meet your network and data transfer requirements, you will want or need to take action.
NAS Data Path Manager To scan for new hardware from Command View NAS: 1. Select the Storage tab. 2. Select Storage Array Summary. 3. Select Action > Scan for New Storage. Assign a LUN to a storage array 1. From the Storage tab, select Storage Array Summary. 2. Select the storage array to which you would like to add a LUN, or select a LUN within that array. 3. Select Actions > Create New LUN. This will launch the Create New LUN dialog box. 4.
NAS Data Path Manager 4. Click the Mode box of the path you wish to change. 5. Select the desired mode for the path (alternate or preferred) from the available options that appear, then click OK. Add Hardware After adding arrays or LUNs to your system, you can configure the paths to them. The recommended progression is as follows. 1. Accept the Default Settings. 2. Remove Hardware as described at on page 30. 3. Manage the Data Paths, if appropriate.
NAS Data Path Manager Optimize Path Performance To improve network traffic across the paths, the most effective changes are to either change preferred paths to alternate, or change alternate paths to preferred. 1. For each LUN involved, select it, then make changes as described at Learn to Perform Basic Data Path Manager Tasks on page 28. 2. Monitor Data Paths as shown on page 17, to see the impact of the change. 3. Continue using this method until you achieve optimal system performance.
NAS Data Path Manager ■ For alternate (and preferred) paths, you can test a specific path from the Volume Groups summary page. From the Storage tab, select Volume Groups. Click on the path you wish to test, then either right-click the path or select Actions. Select Test Selected Path. The test can take up to two minutes, and will return the following results. — If the path passes the test, the Path test results box will appear and show a message stating “The test of the selected path was successful.
NAS Data Path Manager Restore to Default Settings If you have customized your preferred and alternate paths, but are not satisfied with the results, you can reset your data path management settings to the default settings at the volume group level. To reset volume group paths to default settings: 1. From the Storage tab, select Volume Groups, and use the tree view (second icon to the right of Actions). 2. Select the LUN to reset. 3. Select Actions > Reset LUN Paths to Factory Settings.
NAS Data Path Manager 34 hp StorageWorks NAS Data Path Manager Installation and User’s Guide
Text API Commands for NAS Data Path Manager A The text API commands documented here allow you to install NAS Data Path Manager, enable and disable the software package, reactivate volume groups, and restore data paths back to factory default settings. To perform other DPM functions, use the graphical user interface. installSystemPackage cdrom://hpNasOs-DataPathManager-1.0-0.i386.rpm Installs Data Path Manager add-on software module from the specified URL.
Text API Commands for NAS Data Path Manager startClusterPackage On an HA system, use after stopClusterPackage to put volume group changes into effect.
glossary Glossary This glossary defines terms used in this guide or related to this product and is not a comprehensive glossary of computer terms. Glossary Active state A state in which a path is currently designated as a preferred or alternate path for data path management. Alternate path A path that is used for LUN access only after all preferred paths to the device have failed. Alternate paths are assigned by the software and are considered by the software to be non-optimal paths.
Glossary High Availability (HA) HA systems are designed to avoid a loss of service during both planned and unplanned downtime. An HA system is based on clusters that have two NAS servers, a Quorum server, and storage that may come from either a dedicated storage configuration or a SAN. The NAS servers share access to the storage and provide failover capabilities for each other, but function as independent servers. Host The server that acts as a file server running the NAS 8000 software.
index A disable 14, 15 disaster recovery 33 disrupt 25, 28 document conventions 6 prerequisites 5 related documentation 5 allocate space 26 alternate 9, 14, 23, 29, 30, 31, 33 arrays 9, 12, 29, 30 assign a LUN 29 audience 5 authorized reseller, HP 7 automatic 13 E C D data paths 12, 13, 17, 30 failover 9, 14 manage 27 default 17, 30, 33 settings 28 delete volume group 25 device limits 31 Index Index change 29 CIFS 28 CIFS connection 25 command line interface 15, 33 configuration drawing 15 connecti
Index failure 31 new 30 remove 30 scan for 30 help, obtaining 6 HP authorized reseller 7 storage website 7 technical support 6 I initiator 12 install 9, 10, 15 L limit, devices 31 load balancing 9, 13 log 31 login 15 LUN allocate 24 assign 29 edit paths 29 path 29 reset 26 traffic 27 M manage 27, 28 mode 29 modes 17 N NFS 28 NFS connection 25 node 21, 26 non-optimal 9, 30 O off-line 23, 29 on-line 23, 29 40 optimal 9, 30, 31 optimize 31 P password 15 path behavior 29 customize 28 edit 29 information
Index storage 9, 10, 30 system requirements 10 system status 31 T target 12 technical support, HP 6 Test Selected Path 23, 25, 31 traffic 27 troubleshooting 31 V volume group create new 24 delete 25 edit 24 information 21, 26 W websites HP storage 7 world wide name 21, 26 hp StorageWorks NAS Data Path Manager Installation and User’s Guide 41
Index 42 hp StorageWorks NAS Data Path Manager Installation and User’s Guide
