pro100Unraid

@JonathanMThank you for extensive reply! Yes, I understand how unraid differs from other redundant drive storages. And feel that i'm allready familiar withs array, pools, vdevs, and even more zfs support in 7+ version. I'll split data from current raid: All "fast" data will be at workstation, will add extra 8tb of nvme for that. All "slow" <250mb/s data should be at NAS. I have 2-3 weeks for "playtime" before moving workstation to smaller case with ssds only. Adding extra 10TB hdd is simple solution that I was also thinking about, but it would be overkill in total storage space. Other option is selling 6 4tb drives and buing not 1, but 2 extra 10tb instead resulting approximately same storage space.

Yes, I have full offsite backup, but with tiny bandwithd, so keeping that for last resort. Going unprotected while transferring is acceptable.

Need data migration advice for newbie. Current setup: Workstation: lsi raid5 6х4tb hdd NAS: Unraid array with new 10tb hdd, 2х512nvme cache, no parity at this moment Need to transfer 9tb data from raid to NAS, then break raid in workstation and move all drives to NAS. Planned final setup: 10tb hdd for parity, 6х4tb hdd data volumes, 2х512nvme cache How to perform this in most efficient way without extra spare hdds or online restore?