I am using My Cloud Mirror 6TB (MCM) as shared storage (photos, music & documents) for 2 iMac on a wired network. It is configured as RAID 1 & the performance has been OK but I recently performed a back up of my Photoshop Elements catalogue (+/- 90GB) & for about 5 days after it could take up to 5 minutes to open one of the shares & data via Finder. The CPU on the MCM was at 99% most of the time. I assume that this was because that Disk i was copying to Disk 2?
My question is: does RAID 1 slow performance & would it be better if I reconfigured the MCM to JBOD with Disk 1 being for data storage & Disk 2 being a destination for an internal back up? Does anyone have experience of this?