IBM AIX-AK FZK 2005 Multipathing with Rdac,  Must run mppUpdate after each configuration change

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IBM Systems Group

Multipathing with RDAC

Must use QLogic non-failover driver

Always uses current path (as reported by DS4000)

RDAC installation

FC HBA driver must be installed and loaded

At least one LUN must be assigned and available

Must use Host Type LNXCLS - AVT turned off

Must update boot loader configuration

Must run mppUpdate after each configuration change

Updates RDAC configuration files

Rebuilds Initial RAMDisk

AIX-AK FZK 2005

© 2005 IBM Corporation

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Contents AIX AK April 2005 Forschungszentrum Karlsruhe IBM Storage with Linux Topics What Is Supported  What is supportedIBM Storage Support for Linux  DS6000, DS8000 SLES8, SLES9, RH-EL PLinux Support Disk DS4000 SLES8, SLES9, RH-EL  359x Sles 8, Sles 9, RH-EL PLinux Support Tape LTO Sles 8, Sles 9, RH-EL  Parallel Scsi attachment also supported  AdvancedLinux Scsi Subsystem Linux Device Addressing Everything is a fileDesign Upper levelLinux Kernel Version Storage Changes in Linux Kernel Wellknown Linux Scsi Limitations Still there Multiple LUN support of RH-EL  DS4000 Specific Other Problems and Pitfalls ESS, DS6000, DS8000 Specific Large filesystems support  Linux Kernel LimitsMultipathing Scenarios Multipathing Concepts LUN Transfer to Alternate Controller  Two multipathing solutions available DS4000 transfers LUNs to alternate controller LUN Thrashing Scenario LUN Thrashing Scenario LUN Thrashing Scenario  Must run mppUpdate after each configuration change Multipathing with RdacRdac Shared Data Scenario Rdac Shared Data Scenario Rdac Shared Data Scenario  DS6000 uses concept of preferred path Preferred Path SDD knows preferred path automatically Preferred Path Shared Data Scenario Preferred Path Shared Data Scenario Preferred Path Shared Data Scenario Preferred Path Shared Data Scenario Host Ports Independent of Controller  ESS and DS8000 have independent host portsIndependent Host Port Shared Data Scenario Independent Host Port Shared Data Scenario Independent Host Port Shared Data Scenario Tape Specifics IBMtape driver  Daemon IBMtapedIBMtapeUtil  Build and install using make  Provides For download as source code  Native Use LTO Devices 3rd party applications Native Library Management Medium Changer Failover Tape and Disk Connected to the Same HBA One driver for all HBAsQuestions & Discussion ESS / DS6000 / DS8000 Resources DS4000 Resources LTO Resources Redbooks White Papers Legal Notices