Transferring from XRaid to Promise Pegasus Thunderbolt RAID

We have an XRaid connected by fibre to an XServe running OSX Server 10.4.11. This is being replaced by a Mac Mini running Lion Server 10.7.3 with a Promise Pegasus 12TB Raid connected to it by Thunderbolt.
What I would like some advice with is, how best to transfer all the data (approximately 3TB) off the existing XRaid and onto the new Pegasus Raid without creating problems with permissions.
The approach that I was planning to use was to attach the XRaid to a Promise SANLink and in turn connect that via Thunderbolt to the available 2nd Thunderbolt connection. I am hoping this will then display the XRaid on the the Mac Mini as well as the Promise Pegasus. I then intend to drag the data from the old XRaid to the Promise Pegasus.
Can anybody tell me whether this will work OK?
Thanks in advance.

Depending on your set-up, you could have both on your network and use Terminal to copy from on server to the other. Using the ditto command will preserve permission information. Syntax / info can be found towards the very end of this page: http://www.mactech.com/articles/mactech/Vol.23/23.10/2310MacInTheShell/index.htm l

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