RAID 5 question

If I first set up a RAID 5 with 3 hot swap drives can I do the following latter:

1) add extra drive so that it will be included in the array without data loss (and downtime)?
2) replace all disks (one by one waiting for rebuild) with larger ones?

I'm considering IBM xSeries with IBM RAID controller.

Thanks!
RAID 5 question

 

 

 

 

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