I did go for SHR-2 (Synology’s take on raid 6) with 2 drive failure protection. And I’m considering getting a “hot spare” drive. My effective storage is just 70TB (still +30TB upgrade over my old setup). But redunancy sure is expensive.
Also that’s 70 actual TB not what the HDD manufacture sells you. They sell you a 20 TB drive, but it’s actually 20 tebibyte … which is just 18.2 terrabyte.
With drives that size, you should be talking RAID6, 80TB storage and 40TB checksum.
Rebuilds will take a long time, and with RAID6 you can at least suffer 2 drives failures and continue to operate fully.
I did go for SHR-2 (Synology’s take on raid 6) with 2 drive failure protection. And I’m considering getting a “hot spare” drive. My effective storage is just 70TB (still +30TB upgrade over my old setup). But redunancy sure is expensive.
Also that’s 70 actual TB not what the HDD manufacture sells you. They sell you a 20 TB drive, but it’s actually 20 tebibyte … which is just 18.2 terrabyte.