We have a 3-node MS-SQL cluster whose data was migrated from virtualized external storage (LUs presented to the VSP from an external array via FC)
into a Hitachi VSP. This was a volume-based migration, "LDEV to LDEV" in Hitachi parlance, I believe.
We now need to move the data for the cluster from the VSP to a different storage system. We wanted to do the reverse of the original migration, i.e. by
presenting LUs from the new array to the VSP and once again doing a volume-based data migration), however we are being told by the folks that operate
the VSP that it isn't possible.
We find that difficult to believe, as the VSP is marketed as having the capability to virtualize external storage arrays from a wide selection of vendors and
that virtualized external storage is supposed to be able to fully participate in data migration operations across multiple tiers.
Can anyone answer this question for us? Is there really some reason why you can migrate data from external storage into a VSP, but *not* in the other
direction (internal --> external???