Wednesday, April 4, 2012

NetApp Experience: Mixed Ownership

When determining where to add a shelf to a production system, disk show -o is useful in determining which loops/stacks contain disks owned by the controller you're planning for.  When the system is properly set up, this works just fine.  When the system already has mixed ownership on a loop but single ownership on the other loops, you would obviously prefer to expand the single ownership loops.  

But disk show -o will not indicate mixed ownership, so it's a bit of a trap.  The additional step you can take would be to either a)check autosupports before for mixed ownership or b) use disk show -v to show all disks, and verify there are no disks on that loop owned by the other controller.

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