Actually there is a way, if you use LVM. You can add a target disk to the same VG, mark the source PV as not allocable with pvchange -xn /dev/sdS (/dev/sdS is a source disk) and move PV to the other disk online with pvmove /dev/sdS.
There is a risk, if the one of these disks would die during the move - you likely lose your data partially or at whole (because it’s a temporary RAID0 with zero redundancy).
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