Upgrade drives and resize iSCSI target

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX2
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I doubt this would work, but it’s been awhile since I’ve played with RAID. You could insert a bigger drive, but when RAID 1 rebuilds, it will only resize up to the original 4TB, not more. The extra 2TB would be left unused. You’ll probably need to use a third party tool to manually resize the partitions instead.