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Adding drive to existing disk group
I have a NAS542 with three 6TB drives in a RAID 5 setup, which i would like to expand with a fourth 6TB drive, hence the need for a disk group. Now, i would like to use the fourth drive temporarily for backing up the existing array.
So, the theory is: Back up array to disk 4, create disk group on disk 1-3, copy data over from disk 4 and add disk 4 to disk group - ending up with one 16TB volume and one 2TB volume.
Is this doable, or is it impossible to add a drive to an existing disk group?
Thank you in advance!