Hot swap 300GB HDD for 2TB HDD

I have an HP Proliant Gen8 Server running 2012 R2 that has 3 300GB HDD's in a 2+1 config I believe (not certain). I need to replace all three drives with 2TB drives. Can I hot swap them out one at a time? If so, which one do I start with and how would I monitor the replication? Two of the HDD's mirror each other and are always active (lit up) and the third drive is inactive (no lights).

I'd appreciate any best practice advice. Thanks.
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I would recommend the following -

1) Backing up data before you begin is essential.  
2) During the upgrade, you can monitor the replication in the HP Array Configuration Utility (ACU)
3) According to the reference documents below, you can hot swap one drive at a time, waiting for data to rebuild on each replaced drive before you replace another.
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