I've had 8x 3TB drives running in a RAID-6 array for a couple of years now, all internal in a full tower case with SATA connectors (4 on a SATA expansion card, 4 on the motherboard).
I'm looking at purchasing a Lenovo SA120 DAS (https://www.amazon.com/gp/product/B00LSQOY6G/) which has 12 bays for drives, and will move all of the drives to the DAS. I plan to use an LSI 9200-8E PCIE (https://www.amazon.com/gp/product/B002QJZLCA/) for a controller card to connect the DAS to the existing tower server.
I've never really used any server-level equipment for storage, and I was wondering if I would expect the array to automatically show up again once the DAS is connected to the PC / controller card (SFF-8088 to SFF-8088 cable). Will MDADM / OMV see the drives as they were connected via SATA cables and be OK with the new setup, or are there precautions or preparatory steps I should be thinking about before doing this? I will be adding 2 new drives to expand the array (and wiping a 3rd drive that got disconnected from my array (forcing it to 'clean, degraded') about 6 months ago and is now re-connected and listed under OMV 'physical disks' but not present in my array list of drives) if it makes any difference.
Thanks in advance.