I am upgrading a server which has four drive bays. I'll be putting a new Adaptec RAID card into the server so it will support large drive sizes. I need to squeeze as much capacity as possible out of this four-drive cage, so 8 TB drives are my most likely choice.
This is a generic file server (but it handles recording video streams from a security system). I would like to use one of the drive bays for a hot standby, which leaves me with three disks to form the RAID array.
Although I could simply use two disks for mirroring + one hot spare, I've seen RAID 1E (spread over three disks + one hot spare, or RAID 5 three disks + one spare.
Is there a good reason to go one way or the other?
I read the question R5 vs R1E, but it doesn't really answer if R5 or R1E is better in the case of a good controller and multiple write streams.