Doing a LUN migration to a thin LUN will do a zero-block detection and not allocate blocks that only contain zero’s

For information on best practices and theoretical rates for the built-in LUN migration feature, you can refer to the following document:

EMC Unified Storage Best Practices for Performance and Availability - Common Platform and Block Storage 31.5 — Applied B…

Please note this document was superceded (and no longer available directly on support.emc.com); however, the latest document doesn't have the same detail.  You can still use the same estimates, and also the comments made about the feature are still relevant even for the latest version of VNX OE for Block.  Skip to the section: "LUN migration" starting on page 87.  While it provides a section on helping you calculate the duration, it also reminds you it is an estimate and there are several factors to consider:

1) Maximum number of active sessions

2) Disk type and RAID configuration (type and number of drives) of source and destination LUNs

3) Heed the warnings about running ASAP (High is default)

4) Table 23 and 24 provide estimates for each of the priorities in MB/s

5) Table 25: Estimating a LUN migration's duration

Review the comments about "mission critical" workloads, "off-hours", and "busy arrays" which will influence your choices about which priority you choose.  Also keep in mind, you are able to change the priority dynamically which gives you the flexibility to maybe run at medium during active hours and high during off-hours.  Also as you will soon read, ASAP may not be the right choice generally speaking, but you can make that choice after reading what you should find as a very good overview of what to expect with this feature.

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glen

Hello guys

I have one more doubt on LUN Migration  .After the completion of migration Target LUN takes the identity of the Source LUN so how this takeover happen in actual from Source to Target ?

Correct, target assume all aspects of the source, including LUN id, host connectivity etc.

The cutover is completed automatically by the array, no intervention is required and the original source LUN is destroyed once the migration is completed.