Mirrorview/A LUN Ownership changes

As long as the trespass is initiated on the primary/source array, the secondary LUN in the mirror will also be trespassed automatically.  Keep in mind, as noted in the MirrorView Knowledgebook, if between mirror updates it may not trespass until the start of the next refresh.  I bring that up since you may not see the secondary immediately trespass.  To answer your other question, there will NOT be a (system) fracture in this scenario either with the trespass initiated manually by a Unisphere admin or by the array (or PowerPath on the host owning the LUN) in consideration of an SP failure.

On the other hand, let's say that the secondary SP were to fail.  In this scenario the mirror would be (system) fractured and will NOT send a similar signal to the source array to trespass the primary LUN.  However, in your scenario, you will likely find that you couldn't manually trespass the secondary LUN anyways will in an active mirror; regardless, for your controlled rebalance of LUNs you would initiate the trespass on the source.  Once trespassed, then you will want to change the default owner on both primary and secondary LUNs.

Next question for you is are these pool LUNs?  Therefore, there is not just the default and current owner, but also the immutable allocation owner.  In that case you would NOT want to manually trespass (and change default owner) per best practices; the only way to modify the allocation owner is to perform a LUN migration.  Both Primary image and secondary image can be migrated in place.

For more information, refer to the MirrorView Knowledgebook and skip to the sections:

https://support.emc.com/search/?resource=DOC_LIB&AlloftheseWrds=MirrorView%20Knowledgebook&SearchWithin=true&adv=y

1) Storage processor (SP) controlling primary image failure

2) Storage processor (SP) controlling secondary image failure

3) LUN migration (Table 7)

EDIT: Added URL to the MirrorView Knowledgebook

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glen