migration guide Migrating from HP StorageWorks Secure Path for Active-Active Disk Arrays to Native Multipathing in HP-UX 11i v3 Part number: AA-RWF2A-TE First edition: February 2007
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Contents About this guide . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP-authorized reseller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Helpful web sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About this guide This guide discusses migration of HP Secure Path for Active-Active Disk Arrays to native multipathing in HP-UX 11i v3. This guide discusses the following topics: • Overview • Migration • Known issues HP technical support Telephone numbers for worldwide technical support are listed at the HP support web site: http://www.hp.
1 Overview HP StorageWorks Secure Path for HP-UX provides high-availability access to the HP Active-Active disk arrays in HP-UX 11i v2 or earlier. It provides automatic failover across the paths of the end storage device (LUN). In addition, it provides the load-balancing of the Input/Outputs (I/Os) across the paths of the storage device and there by improving the I/O throughput. A device special file (DSF) is created for each path to the end LUN which allows you to access the LUN through any of its paths.
Overview
2 Migration This chapter provides information about: • Need for migration • Migrating to HP-UX 11i v3 Need for migration HP-UX 11i v3 operating system (OS) no longer supports Secure Path. HP-UX 11i v3 has the native multipathing capabilities. After the OS upgrades to HP-UX 11i v3, the virtual aliases provided by Secure Path (Active-Active) are no longer available. The applications that use Secure Path virtual aliases, start using the system provided persistent DSFs.
Where: is the alias provided by Secure Path for Active-Active disk arrays, and is the new DSF introduced in HP–UX 11i v3 to represent each LUN. • Update the /etc/fstab with HP–UX 11i v3 disk device special file by replacing the virtual aliases provided by Secure Path for Active-Active disk arrays. Migration process The migration process is automatically executed when the OS upgrades to HP-UX 11i v3. It requires no user intervention.
3 Known issues The following are the known issues while migrating from Secure Path to native multipathing in HP–UX 11i v3: • Mount points using Secure Path (Active-Active disk arrays) virtual aliases are replaced with the new persistent DSFs, and are not automatically remounted. • Migration process does not deal with HP Active-Passive disk arrays, except for uninstalling and generating the mapping between the Secure Path (Active-Passive disk array) pseudo DSFs and LUN WWNs.
