Overview: The Next Generation Mass Storage Stack (September 2009)

Legacy Device Special Files and Hardware Paths ...........................................................................26
Tunable Kernel Parameters...........................................................................................................26
Changes to Existing Procedures........................................................................................................26
Replacing a Disk.........................................................................................................................27
Force-Binding a Driver .................................................................................................................27
Disabling Multi-Pathing on Legacy DSFs.........................................................................................28
Changes to Other Subsystems..............................................................................................................28
Crashdump....................................................................................................................................28
fcmsutil(1M) ...................................................................................................................................29
HP System Management Homepage .................................................................................................29
Ignite-UX........................................................................................................................................30
Logical Volume Manager.................................................................................................................32
Offline Diagnostic Environment ........................................................................................................33
PA-RISC Boot Subsystem ..................................................................................................................33
setboot(1M) ...................................................................................................................................34
Support Tools Manager...................................................................................................................34
Third-Party Multi-Pathing Products .....................................................................................................34
VERITAS File System........................................................................................................................35
VERITAS Volume Manager...............................................................................................................35
Virtual Partitions .............................................................................................................................35
Migrating to the Agile View.................................................................................................................35
Benefits of Migration.......................................................................................................................35
Backward Compatibility ..................................................................................................................36
Coexistence ...................................................................................................................................36
Installing versus Updating ................................................................................................................36
Migrating an Existing System ...........................................................................................................37
Migrating Kernel Software...............................................................................................................37
Conclusion ........................................................................................................................................37
Glossary ...........................................................................................................................................38
Appendix A: Summary of Changes ......................................................................................................40
New Commands ............................................................................................................................40
Existing Commands with New Options .............................................................................................41
Deprecated and Obsolete Tunable Kernel Parameters.........................................................................42
New Device Tunables .....................................................................................................................42
New Mass Storage DSF Naming Conventions ...................................................................................43
Appendix B: Using ioscan ...................................................................................................................44
Appendix C: Using scsimgr .................................................................................................................49
Introduction to scsimgr.....................................................................................................................49
Retrieving Status of SCSI Objects......................................................................................................50
Retrieving Target or LUN Statistics ....................................................................................................51
Mapping Multi-Pathed LUNs ............................................................................................................53
Obtaining WWID, Serial Number, and LUN id of a LUN....................................................................54
Selecting Load Balancing Algorithms ................................................................................................55
Assigning Aliases to LUNs ...............................................................................................................56
Appendix D: Interpreting Lunpath Hardware Paths .................................................................................57
Components of Lunpath Hardware Paths ...........................................................................................57
Parallel SCSI ..................................................................................................................................57
Fibre Channel ................................................................................................................................57
Serial Attached SCSI.......................................................................................................................59
For more information ..........................................................................................................................61