looking for advice on raid drives upgrade

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Hi all,

one of my raid's is currently a raid5 with 4 1TB drives, which I'm going to upgrade by replacing all drives with 2TB drives.
Main question: what is recommended:

- offline the raid, dd(rescue) each 1TB drive onto a new 2TB one, replace drives, put raid online again

or:
- manually replace one drive at a time, and let the raid recover and thus write the data onto the new drive?

As far as I know all current drives are healthy; regularly SMART monitoring and raid checks have not ringed any bells sofar.

I guess offlining and dd-ing would be more secure, but I might miss something and would like to hear other considerations from people more experienced in this area.

Regards,
Vincent Schut.

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