What are the recognized ways to increase the size of the RAID array online/offline?

Posted by user149509 on Server Fault See other posts from Server Fault or by user149509
Published on 2012-12-13T15:15:54Z Indexed on 2012/12/13 17:05 UTC
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raid

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resize

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array

Is it possible, in theory, increase the size of the RAID-array of any level just by adding new drive(s)? Variant like "backup whole data -> delete old array -> add/replace disks -> create new array -> restore data" is obvious so what are the other options?

Does it depend on the RAID-level only or on the implementation of RAID-controller only, or on both?

Adding new disks to a striped array necessarily leads to a rebuilding of the array with the redistribution of the strips to the new drives?
What steps should be done to increase size of RAID-array in online/offline scenarios?
Especially interesting RAID-5 and RAID-10.
I would like to see the big picture.

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