Provided is a method for copying storage. Copy operations are performed on source storage units to copy to target storage units, wherein the copy operations create a consistent copy of the source storage units in the target storage units. While performing a copy operation to copy from one source storage unit to one target storage unit, a write operation is restricted from being performed on the one source storage unit, until the copy operations have been performed on the source storage units.

 
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< Maintaining write order fidelity on a multi-writer system

> Moving hardware context structures in memory while maintaining system operation

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