
System doesn't have EFI BIOS and RAID controller cannot divide composite RAID into separate LUNs, hence these options:
1. RAID-5, with 2 LUNs, 1x 100GB for system and remainder for backups (~8.7TB)
2. RAID-6, with 2 LUNs, 1x 100GB for system and remainder for backups (~7TB)
3. 3x RAID-1 LUNs, 100GB partition on the first for system then the remainder striped using Windows Disk Manager to create the backup volume effectively RAID-10 (5.2TB).
Plan is to use reverse incremental backups, backup set is 2TB (raw, today).
I presume this will present quite a random IO workload as time progresses and the de-duplication effectively scatters the backups, and with that in mind I my gut feel is to use the RAID-10 implementation even though it's messy, to avoid the 6-IO write penalty of RAID-6 or the potential rebuild risk of RAID-5. Of course one can't ignore the capacity difference! The server itself will be streamed to tape weekly.
Any thoughts or experiences, especially using SATA drives with RAID-6 with Veeam Backup, would be very much appreciated.
Thanks!