Migrating with too many drives

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Migrating with too many drives

My old 1815+ and expansion bay just died. It was full of Raid1 drive pairs and I bought a new 1821+ and 4 drives big enough to transfer everything over. But now I'm actually stumped on how to achieve this. I assumed I could just install the 1821 with the new drive in it normally and add the old pairs (or one of each pair) in the free bays to just make the data transfers but this doesn't seem to work easily.

What would be the correct method to migrate the data here? I would plug in all the old drives in and migrate this way but obviously I'm missing bays to achieve this...
 
It sounds like you have already set up the DS1821+ with the new drives... (and likely thinking you could add a pair of the old drives at a time to copy to your new drive storage volume).

You could have moved all the drives from the DS1815+ and then migrated DSM on the new unit, and then swapped in the larger drives one-by-one, as required. I appreciate that you may be trying to go to SHR from your pairs of drive sets, which is likely complicating things.
 

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