DB is 150GB and I cannot take it offline long enough to apply logs to a back up.
I am moving from one sub storage system to another.
Any mirroring ideas?

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back up.

Not sure what you mean.

Or rather, not clear on why you can't do a full backup, restore that with
NORECOVERY to your target system.
Perform a transaction log backup, NORECOVERY (this one will be relatively
large since the restore will probably take a long time).

Continue above step until your transaction backup is relatively small and
can be applied quickly (i.e. say under a minute) and simply do a transaction
backup on your source, apply it to your destination and then make it life.


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