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sara2000

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lun migration

Have few physical servers attached to equallogic storage's LUN via guest os initiator (RAW lun) and want to migrate this lun to EMC vnx.
Many of you must have done this in your environment,  What is the best way to do this?
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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you cannot easily move/migrate RAW LUNs between SAN vendors, so it comes down to a basic copy from LUN A to LUN B.

so present LUN A and LUN B to the same physical server and then use you favourite clone disk tool to copy the volume or partition.

robocopy can do the same sync or mirror operation until cutover.
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sara2000

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I was told that robocopy is not an ideal for the data which we have on that LUNs.
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May be i did not give enough info, this is not VMs, they are physical servers attached to equallogic lun using microsoft iscsi initiator. SQL applications.
No, you said physical server alright. I just inserted the idea of VMs because of the VMware tag on the question.

I think my advice remains the same for physical servers.

So the choice is between a block-for-block clone of the LUN...several tools will do that...or a file-system aware copy that would not copy parts of the LUN that don't contain data, with Robocopy being an example. The block-for-block copy might still be faster, despite the extra copying, because it boils down to sequential read from one LUN and sequential write to the other.

I'm not aware of a way to do this "live", as might be possible if you were migrating LUNs served by compatible storage systems.
Depends whether you can turn off the SQL Servers!

CLONE Tool, or Migrate the SQL applications correctly.
I will try and let you know how it went.