EMC VNX – LUN MIGRATION April 24, 2013December 17, 2014 David Ring VNXEMC, VNX This post is a result of having to migrate Cisco UCS Blade boot LUNs between Raid Groups. Both the source and destination were Classic LUNs – RAID Group LUN (FLARE LUN/FLU). The migration occurred across two DAE’s, with each DAE populated with one Raid Group. This is the ideal scenario for best migration performance – having the load spread across different RG’s and also spread across backend ports. The Rates have an incremental effect on the Storage Processor utilization. We used the ASAP migration rate which was acceptable as the system was not in production and would not therefore impact performance of other workloads. Also note that two ASAP migrations can be performed simultaneously per Storage Processor. For migration of a LUN within a VNX array the following rates can be used in the calculation:Priority Rate (MB/s)Low 1.4 MB/sMedium 13 MB/sHigh 44 MB/sASAP 85 MB/sCalculation for the Migration of a LUN is as follows:Time = (Source LUN Capacity * (1/Migration Rate)) ((Destination LUN Capacity – Source LUN Capacity) * (1/Initialization Rate))Calculation for the migration of a 20Gig BOOT LUN between Raid Groups at ASAP SPEED (85MB/s):Source LUN = 20000MBDestination LUN = 20000MBMigration Rate is 85MB/s = 306000 MB/HourInitialization Rate = 306000 MB/Hour(20000 * (1hour / 306000)) ((20000



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