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// ]]>EMC VNX LUN Migration Proven Best Practises. ~ EMC VNX Training & SAN NAS Unified Storage Certification.// //

LUN Migration moves data from a source LUN to a destination LUN (of the same or larger size) within a single storage system. This migration is accomplished without disruption to the applications running on the host. LUNs can be the target or source of LUN migration operations. LUN Migration can enhance performance or increase disk utilization for your changing business needs and applications by allowing the user to change LUN type and characteristics, such as RAID type or size, while their production volume remains online. LUNs can be moved between pools or to a traditional LUN in another RAID group. When migrating a thin LUN to another thin LUN, only the consumed space is copied. When migrating a thick Pool LUN or traditional LUN to a thin LUN, the space reclamation feature is invoked and only the consumed capacity is copied.

LUN migration allows data to be moved from one LUN to another, regardless of RAID type, disk type, LUN type, speed and number of disks in the RAID group or Storage Pool with some restrictions. The process involved in the migration is the same across all VNX systems. On VNX series with the Thin provisioning enabler installed, LUNs can be migrated from a Thin

or Thick LUN to a traditional LUN and vise-versa.
The LUNs used for migration may not be private LUNs or Hot Spares, nor may they be in the process of binding, expanding or migrating. Either LUN, or both LUNs, may be metaLUNs. Neither LUN may be a component LUN of a metaLUN. The destination LUN may not be part of SnapView Snapshot, SnapView Clone or MirrorView operation. This includes Clone Private LUNs, Write Intent Log LUNs, and Reserved LUN Pool LUNs.
Note the Destination LUN is required to be at least as large as the Source LUN, but may be larger.

The LUN Migration feature is transparent to any host accessing the Source LUN, though there may be a performance impact. Copying of data proceeds while the Source LUN is available for read/write access, and the copy process may be terminated at any time. Once all data is copied, the Destination LUN assumes the full identity of the Source LUN, and the Source LUN is unbound as a security measure. The host accessing the Source LUN sees no identity change, though of course the LUN size
may have changed. In that case, a host utility, such as Microsoft Windows diskpart, can be used to make the increased space available to the host OS.