Raid 1 rebuild 17% after 5 days?

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX2
1

Hi! My NAS seems to lose power at last wednesday. I dont know, because i was on a journey. Now it is rebuilding disks. But is it right, that the rebuild takes that long? There are 2 8TB disks inside and the rebuild reached up to 17%. For me, that seems to be a bit slowly?

Any ideas?

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See if this article helps - My Cloud: Slower Than Expected RAID Rebuild