Hello,  Re: 1.  Yes, current data will not be impacted by adding in drives.   Re: 2  Normally the drives will be automatically added in without manual intervention.  Re: 3.  Not with any accuracy.  So much depends on what else is occurring at the time.  Re: 4.  No, you can't alter the prioritization of IO operations to rebalance operations.  Re:5.  The system will favor the creation of R6-10 RAID.  However R6-6 may still exist on the system if the existing drives are already fully allocated.  If you want to review after the disks are adding, I recommend opening a support ticket  Regards, Don   
Dear all, My customer ha a SCv2020 with 7 x 1.2 TB 10K configure with RAID Dual Redundant Level RAID10DM/RAID6-6. Please help on my question as: 1. Can I do add disks during the storage system running? Customer data will be OK? 2. I have to install the new 8 x 1.2 TB 10K disks to the system. Please help to confirm the steps are correct. 1. Add the 8 Disk to the blank slot. 2.Select a Storage Center from the Storage view. 3. Click the Storage tab. 4. Select the Disks node. 5. Click Scan for Disks 6. Click Manage Unassigned Disks. 7. Select Disk Folder "10K" 8. Click change 8 new disks to assign. 9. Click Rebalance 3. For Rebalance, could you give me the roughly idea of how much time its take? May be GB/hours? 4. Can we configure the workload of RAID rebalance e.g. 80% of storage resources do service the hosts and 20% of storages resources do the RAID rebalance? Or which option can I do to minimize the impact of customer production workloads? (20 Hyper-V VMs) 5. After RAID rebalance. Is the RAID Level will change to RAID 10DM/RAID6-10? Due the total disks are 14 (with One Spare) Thanks you,  Natthaphol
Steps how to add new disks to SCv 2020 and RAID Rebalance time