vSphere 5.0 uses a mirrored-mode approach for Storage vMotion. In this new architecture,
Storage vMotion copies disk blocks between source and destination and replaces the need for the iterative pre-copy phase. This was used in the Changed Block Tracking (CBT) method in earlier versions of vSphere. With I/O mirroring, a single-pass copy of the disk blocks from the source to the destination is performed. I/O mirroring ensures that any newly changed blocks in the source are mirrored at the destination. There is also a block-level bitmap that identifies hot and cold blocks of the disk, or whether the data in a given block is already mirrored in the destination disk.
Storage vMotion copies disk blocks between source and destination and replaces the need for the iterative pre-copy phase. This was used in the Changed Block Tracking (CBT) method in earlier versions of vSphere. With I/O mirroring, a single-pass copy of the disk blocks from the source to the destination is performed. I/O mirroring ensures that any newly changed blocks in the source are mirrored at the destination. There is also a block-level bitmap that identifies hot and cold blocks of the disk, or whether the data in a given block is already mirrored in the destination disk.
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