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In case you connect expansion tray according service adviser it will not require downtime.
Both controllers have connect to both loop ( via interconnect) so disconnect one FC cable do not cause any
trespass off volumes.
When you add two expansion - it will connect to different ports on 6140 array. Read carefully docs.
Sun StorageTek 6140 Array Hardware Installation Guide
Thanks for your prompt response. one last question, if I disconnect two fibers from Controller B volumes trespass automatically to controller A?
What cables you plan disconnect ?
In case you disconnect cables to expansion - it's not cause volumes trespass.
In case you disconnect cables two host - it's cause volumes trespass by host.