IBM AIX-AK FZK 2005 manual LUN Thrashing Scenario

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IBM Systems Group

LUN Thrashing Scenario

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

A DS4000 B

Disk

LUN 0

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  DS4000 SLES8, SLES9, RH-EL PLinux Support Disk DS6000, DS8000 SLES8, SLES9, RH-EL PLinux Support Tape  LTO Sles 8, Sles 9, RH-EL 359x 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 ESS, DS6000, DS8000 Specific Other Problems and Pitfalls Multiple LUN support of RH-EL  DS4000 Specific Large filesystems support  Linux Kernel LimitsMultipathing Scenarios Multipathing Concepts  DS4000 transfers LUNs to alternate controller  Two multipathing solutions availableLUN Transfer 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  SDD knows preferred path automatically Preferred Path DS6000 uses concept of preferred path 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 IBMtaped For download as source code  Build and install using make  ProvidesIBMtapeUtil  3rd party applications Use LTO Devices Native 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