IBM AIX-AK FZK 2005 manual Preferred Path Shared Data Scenario

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IBM Systems Group

Preferred Path Shared Data Scenario

Linux host 1		Linux host 2
HBA 0	HBA 1	HBA 0	HBA 1

1	DS6000	2
	DS6000

Disk

LUN 0

AIX-AK FZK 2005

© 2005 IBM Corporation

Image 27

Contents AIX AK April 2005 Forschungszentrum Karlsruhe IBM Storage with Linux Topics  What is supported What Is SupportedIBM Storage Support for Linux PLinux Support Disk  DS6000, DS8000 SLES8, SLES9, RH-EL DS4000 SLES8, SLES9, RH-EL  Parallel Scsi attachment also supported  Advanced PLinux Support Tape LTO Sles 8, Sles 9, RH-EL  359x Sles 8, Sles 9, RH-ELLinux Scsi Subsystem Everything is a file Linux Device AddressingUpper level DesignLinux Kernel Version Storage Changes in Linux Kernel Still there Wellknown Linux Scsi LimitationsOther Problems and Pitfalls  Multiple LUN support of RH-EL  DS4000 Specific ESS, DS6000, DS8000 Specific  Linux Kernel Limits Large filesystems supportMultipathing Scenarios Multipathing Concepts  Two multipathing solutions available LUN Transfer to Alternate Controller DS4000 transfers LUNs to alternate controller LUN Thrashing Scenario LUN Thrashing Scenario LUN Thrashing Scenario Multipathing with Rdac  Must run mppUpdate after each configuration changeRdac Shared Data Scenario Rdac Shared Data Scenario Rdac Shared Data Scenario Preferred Path  DS6000 uses concept of 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  ESS and DS8000 have independent host ports Host Ports Independent of ControllerIndependent Host Port Shared Data Scenario Independent Host Port Shared Data Scenario Independent Host Port Shared Data Scenario Tape Specifics  Daemon IBMtaped IBMtape driver Build and install using make  Provides IBMtapeUtil For download as source code Use LTO Devices  Native 3rd party applications Native Library Management Medium Changer Failover One driver for all HBAs Tape and Disk Connected to the Same HBAQuestions & Discussion ESS / DS6000 / DS8000 Resources DS4000 Resources LTO Resources Redbooks White Papers Legal Notices